Editorial Board

Dr Henrik Aagaard is an orthopaedic surgeon, with expertise in the fields of the  knee, ligament and meniscus, shoulder, sports and dance medicine.

He completed his MD, University of Copenhagen, in 1988 and his PhD, University of Copenhagen in 1998. His PhD thesis on meniscus transplantation was published in1998. He has published 15 papers in peer reviewed papers in international journals and 50 abstract presentations in scientific associations.

He has been as surgeon-in-chief at Sports Trauma section, University Hospital Seeland, Koege, since 2017. He has been an Assistant Professor at the University of Copenhagen since 2017.

He has been an active member in the following societies: Danish Society of Sports Medicine, Danish Orthopaedic Society, European Society of Sports Traumatology, Knee Surgery and Arthroscopy, Danish Society of Arthroscopy and Sports Traumatology, Dance Medicine and Science.

Nobuo Adachi

Jens Agneskirchner

Eduard Alentorn-Geli

Prof. Dr Karl Fredrik Almqvist trained at the University of Ghent in Belgium and worked at the Ghent University Hospital where he was Head of Clinic, Department of Physical Medicine and Orthopaedic Surgery, prior to moving to Dubai in 2014.

He also has considerable teaching experience as an assistant professor in physiotherapy and orthopaedic surgery at Ghent University. He has published extensively and written a number of book chapters. He is a regular speaker at international meetings and is on the editorial board or is a reviewer for the major sports orthopaedic journals.

He obtained his PhD in 2001 (Human differentiated articular cartilage cells in biodegradable matrices – Preparative studies for their use in the repair of cartilage defects).

Prof. Almqvist is active in a number of orthopaedic organisations, and is the Past-Chairman of the Sports Committee of the International Society of Arthroscopy, Knee Surgery &Orthopaedic Sports Medicine as well as the past Chairman of the Cartilage Committee of the European Society of Sports Traumatology, Knee Surgery & Arthroscopy.

The main area of interest is knee surgery. His expertise covers the whole range of knee conditions from sports injuries to knee replacement.

 

Dr Bogdan Ambrožič received his medical degree from the Faculty of Medicine at the University of Ljubljana, Slovenia, in 1995 and he finished his residency in orthopaedics in 2001.

In 2009, he received a master’s degree in medical science and in 2017 he finished the PhD, analysing the influence of medial patellofemoral ligament (MPFL) on patellar stability.

His practice is based on arthroscopic and minimally invasive surgical treatments of injuries and diseases of the shoulder, knee joint and ankle, also through the use of computer technology.

In the shoulder joint, he most often intervenes in arthroscopic stabilization of the joint and in the reconstruction of the rotator cuff. In the case of the knee joint, he performs meniscus and cartilage repair, reconstruction of ligaments, including multi-ligament injuris and osteotomies around the knee. In these procedures, he uses navigation and 3D printed guides for each patient’s and its individual anatomy.  In addition, he performs stabilization of the patella by reconstructing the MPFL, the transposition of the tibial tuberosity and trochleoplasty. In the ankle, in addition to normal arthroscopic procedures, he performs arthroscopic stabilization of the joint and tendinoscopies.

In addition, he uses biological methods for treating damaged joints and tendinopathies with thrombocyte plasma (PRP), stem cells and amniotic membranes.

In Slovenia, he introduced the method of stabilising the patella with the reconstruction of the medial patellofemoral ligament (MPFL), the method of reconstructing the anterolateral ligament (ALL) and he performed the first meniscus transplantation. He also started performing osteotomies in the knee joint by means of navigation and patient specific guides. He organized numerous arthroscopic symposia and workshops, and he is visiting lecturer at conferences and symposiums in Slovenia and abroad. He is a member of the European Committee for Osteotomy, and an active member of the Slovenian Association for arthroscopy and sports injuries.

Prof. Andrew A. Amis is currently the head of the Medical Engineering Research Group at Imperial College, London. He has worked in biomechanics research since 1974. His qualifications include PhD in 1978, for a thesis titled Biomechanics of the upper limb and design of an elbow prosthesis. Since then he has worked on many novel and patented prosthesis and instrument designs, including artificial ACL implants and, more recently, ceramic hip resurfacing.

Prof. Amis joined ESSKA in 1992 and chaired the Basic Sciences Committee for four years, and was guest editor of several themed issues of the KSSTA journal. This work has led to more than 400 publications about orthopaedic research, and that record led to the award of DSc(Eng) in 1999, Fellowship of the Royal Academy of Engineering (FREng) in 2014, and Honorary Fellow of the British Orthopaedic Association in 2017.

Prof. Amis was the inaugural International Research Professor of the ACL Study Group in 2005-06, and has a particular interest in knee instability and development of novel soft-tissue reconstructions. This work is based on understanding the structure-function relationship derived from detailed study of the anatomy.

Elizabeth Arendt

Dr Peter Balcarek studied at the Universities of Magdeburg, Canberra – University of Sydney, and Göttingen. He received his MD at the University Medical Center of Göttingen (UMG) in 2002 and completed a specialisation in Orthopaedics and Traumatology (Prof. K.M. Stürmer/Prof. K.-H. Frosch) in 2010. He acquired further knowledge during his specialty training including an AO fellowship at the Rashid Trauma Center, Dubai (Prof. Peter Messner/Prof. Bernd Claudi) and attained additional qualification in Special Trauma Surgery in 2015. From 2010 to 2015 he headed the Division of Knee and Shoulder Surgery, Sports Traumatology at the Department of Traumatology and Orthopaedics, Göttingen. In 2013 Dr. Balcarek earned a PhD for his work on patellofemoral instability. Currently, he works as a Senior Consultant for Orthopaedic and Trauma Surgery at the Arcus Sports Clinic in Pforzheim, Germany.

His clinical and scientific interests focus on reconstructive knee surgery with special interest related to the patellofemoral joint. Dr. Balcarek has authored and co-authored over 40 peer-reviewed articles and numerous book chapters. He has given over 100 national and international conference presentations, lectures and demonstrations. He is also an established member of the following professional associations and serves as an active member in committees of the European Society of Sports Traumatology, Knee Surgery and Arthroscopy (ESSKA), the Association for Arthroscopy and Joint Surgery (AGA), and he is a certified Board Member of the German Knee Society (DKG). He received the “Alwin-Jäger-Award” 2013 (AGA) and the 1. Poster Price of the German Congress for Traumatology and Orthopaedics in 2009. Since 2013 he serves as an Editorial Board Member of KSSTA.

 

Andrea Baldini

John Bartlett obtained his FRACS in 1973 and subsequently specialised in knee surgery involving arthroscopy, cruciate ligament reconstruction and knee arthroplasty.

He has lectured in 38 countries; published in 18 peer reviewed orthopaedic journals and contributed 5 book chapters. He has received the LO Betts Medal from the AOA — and has been awarded Honorary Life Membership of the AMA, AKS, ISAKOS, ESSKA, AANA and AFL Trainers Association; the Takagi-Watanabe Award from APKASS and the first Education Award from APOA.

He is the Patron to ASSA and has been Presidential or invited Guest Lecturer to the AOA, NZOA, Malaysian OA, Indonesian OA, Philippines OA, Japanese AA, BASK, ESSKA, APKS and APKASS.

Dr Bartlett for more than 20 years was Supervisor of the Melbourne Fellowship in Knee Surgery, training some 100 International and Australian Fellows. He has also been awarded Traveling Fellowships for teaching by the RACS, AOA, APOA, APOSSM and the Cleveland Clinic. He has held Executive  and/or Committee Chairman positions with the APOA, AOA, AKS, ISAKOS, APKS, APKASS, ACLSG and Magellan Society and has been an Editorial Board member of Asian, American and European journals.

He recently retired as Director of Specialist Surgery at the Austin & Repatriation Hospital and Senior Lecturer at the University of Melbourne. Dr Bartlett has a keen sporting interest in golf, tennis, football, cricket, fishing, skiing and horse racing. His current duties include Chairman of ISAKOS Committees, Associate Editor JBJS(A)OA, teaching and consultancy work.

Thomas Bauer

Mike Baums

Christoph Becher

Dr Michel van den Bekerom, after completing his residency at the Academic Medical Center of Amsterdam (under Prof. CN van Dijk), he did a fellowship on shoulder and elbow surgery. (Prof. D Eygendaal).

Since 2012, he has been working as a staff orthopedic surgeon at the Onze Lieve Vrouwe Gasthuis in Amsterdam and focuses mainly on (arthroscopic) treatment of shoulder and elbow pathology and sports injuries.

He contributes to the training of physiotherapists, residents and fellows. He combines his clinical practice with performing scientific research.

He has published over 200 articles, given more than 100 national and international lectures and is, currently, involved in several student and resident PhD projects.

He plays a part in the  scientific collaboration of the department of Movement Sciences, Orthopedic Surgery of the Academic Medical Center of Amsterdam with Boston (US) and Adelaide (Australia). He was a member of the scientific committee of the ESSKA congress in Glasgow and Barcelona, is an editorial board member of the KSSTA journal and member of the ESSKA-Elbow and Wrist Committee. As treasurer for the Dutch Association for Arthroscopy he also collaborates with ESSKA.

Michael Bohnsack

Urlich Bosch

Kristin Briem

Annelie Brorsson

Mike Carmont

Dr Antonia F. Chen is an accomplished orthopaedic surgeon and researcher. She is currently the Director of Research, Arthroplasty Service at Brigham and Women’s Hospital at Harvard Medical School, USA. She was the Associate Director of Research at the Rothman Institute in Philadelphia, an Associate Professor at Sidney Kimmel Medical College, and the Director of Medical Education Curriculum, Musculoskeletal Studies at the Sidney Kimmel Medical College and Thomas Jefferson University.

She received her BS from Yale University and her MD from Rutgers Medical School, where she graduated with Distinction in Research and was inducted into the Alpha Omega Alpha Medical Honor Society.

Dr Chen received her MBA from Rutgers Business School and is a member of the Beta Gamma Sigma Honor Society. She completed her orthopaedic residency at the University of Pittsburgh and her fellowship in hip and knee arthroplasty at the Rothman Institute.

She is on the editorial board of six journals, and is the president of the Musculoskeletal Infection Society. She has authored over 100 publications, 35 book chapters, and two books, has won multiple research awards, and has presented all over the world.

She specialises in the research and treatment of periprosthetic joint infection and arthrofibrosis. Her interests lie in the perioperative management of total joint arthroplasty patients. She has been a reviewer for the KSSTA journal for many years, and serves on the board of EKA.

Dr Martin Clauss started his post-graduate training at the Orthopedic University Hospital in Heidelberg in 2002, and became a resident at the KantonsspitalBaselland (Liestal, CH) with Prof.  PE Ochsner and Prof. W Zimmerli in 2003.

After completing his board examinations  in Orthopedics and Traumatology (FMH) in 2009, he started a Research Fellowship on “Infected Bone Grafts” with Prof. Trampuz (CHUV Lausanne, Switzerland) in 2010.

Returning to Liestal, he became a consultant in Hip and Knee arthroplasty. In 2015, he completed a “Hip and Knee Arthroplasty Fellowship” with Dr G  Hellemondt at the St Maartenskliniek (Nijmegen, The Netherlands).

Dr Clauss is currently working as the Head of the Interdisciplinary Septic Surgical Unit and Consultant for Hip Arthroplasty at the University of Basel and KantonsspitalBaselland, Switzerland.

His major scientific interest is long-term results of hip and knee arthroplasty as well as the treatment of infections with a special focus on infected bone grafts. After finishing his thesis on infected bone grafts by 2016-end, he became an Assistant Professor at the University of Basel.

He is currently the president of the combined Expert Group “Infection” of Swiss Orthopedics and Swiss Society for Infectious Disease.

Since September 2017, he has been part of the ExCom of the European Bone and Joint Infection Society (EBJIS) in the position of a treasurer.

Ramon Cugat

Dr David Dejour is an orthopedic surgeon working in Lyon. He is currently President of ESSKA and has been involved in the board of the French Arthroscopy Society (SFA) and the French National society (SOFCOT). He is the medical director of the Lyon Ortho Clinic in France

His primary interest is knee surgery from sport medicine to arthritis. He has numerous publications about ACL, return to sport and muscle recovery after sport’s trauma, Patellofemoral, Osteotomies around the Knee. He published the Trochlear’s dysplasia classification and described the Deepening Trochleoplasty.

He is in charge of professional soccer, rugby, basket, handball teams with the Sportmedicine center.

Prof. Matteo Denti received his degree in Medicine and Surgery at the University of Milan, Italy, in 1980. He then completed his Orthopaedic Residency  at the Istituto Ortopedico Matteo Rota in Bergamo and at the 2rd Orthopaedic Dpt. Of the University of Milan, San Gerardo Hospital Monza and degreed in Orthopaedic in 1985.

From December 1985 to May 1996, he served as an assistant and then as Vice-Chairman at the 2nd Orthopaedic Department of the University of Milan, San Gerardo Hospital, Monza, with special interest in knee and shoulder surgery and arthroscopy.

From May 1996 to September 2000, he was Chief of the Arthroscopic Unit at the Orthopaedic Dpt. of the University of Milan, San Gerardo Hospital, Monza. From September 2000 to December 2009, he was appointed  Chief of the Sports Traumatology and Arthroscopic Surgery Unit at the Galeazzi Institute, Milan.  From January 2005 to December 2016, he was Consulting Orthopaedic Surgeon at Clinica Luganese, Lugano, Switzerland.  From January 2010 to 2015, he was Co-Chairman of the Knee Surgery and Sports Traumatology Unit at the Humanitas Institute, Milan.

From January 2016 Reserarch Consultant at Galeazzi Institute, Milan  and Consulting Orthopaedic Surgeon at Villa Aprica Insitute Como, Italy. From January 2017, he was sppointed Consulting Orthopaedic Surgeon at Ars Medica Gravesano, Lugano, Switzerland.  From 1988, he was Professor for Teaching at the University of Milan at the Orthopaedic Medical School.

In 1986, the Italian Orthopaedic and Traumatology Society  awarded  Prof. Denti with a fellowship in the USA for knee surgery at the Hospital for Special Surgery, New York.  In 1986,  he received an award from the North Italian Orthopaedic Society for a fellowship in the USA for knee surgery at the Rochester University, Rochestre, NY. In 1989 he won the ESKA-AOSSM travelling fellowship. In 2006, he was godfather for the ESSKA-WPOA fellowship.

Prof.  Denti is member of these scientific societies: ISAKOS: International Arthroscopy, Knee, Sports Traumatology Association,  ACL Study Group, Herodicus Society, ESSKA, Società Italiana di Ortopedia e Traumatologia, Società Italiana di Artroscopia, Traumatologia dello Sport, Chirurgia di Ginocchio e Tecniche ortopediche.

Prof. Denti is honorary member of these scientific societies: AOSSM, SPAT, SCCOT, the Ukrainian Association of Sport Trauma, Knee Surg., Arthroscopy.

Prof. Denti was elected board member of these scientific societies:  Società Italiana Artroscopia (2001-2004), Chairman of the Educational Committe of ESSKA (2002-2004 ), vice-president of SIGASCOT (from 2004 ) and President of SIGASCOT (2008-2010) and Past-President of SIGASCOT (2010-2012), ESSKA Educational Secretary and then Treasurer (2004-2008),  member of the Knee Committe of ISAKOS (2005-2009),  ESSKA President (2014 to 2016). He is also board members of the  KSSTA Journal, SMARTT Journal, JST Journal, JEO Journal.

Prof. Denti specialises in disorders of the shoulder and knee, including those treated with open and arthroscopic surgery. He has lectured more then 300 scientific papers at medical congresses in Europe and the USA. He has also served as the orthopaedic consultant for the Italian Ski Federation, Asystel Milan Volleyball Team (1st League), Oregon Cantù Basketball Team (1st League) and Como Football Team (1st League).

Prof. Denti is author of 124 scientific papers published in Italian and international orthopaedic journals. He has presented more than 500 papers at national and international congress (Europe, USA, Canada, Asia, Australia, New Zealand, Africa, Middle East).

C. Niek van Dijk

Patrick Djian

Brian Donley

Prof. Mahmut Nedim Doral, MD, is internationally recognised for his expertise in orthopaedic sports medicine. He has authored over 150 scientific articles (more than 110 international and 200 national publications) in peer-reviewed journals and over 15 book chapters in internationally-published books  and he acts as a referee in six international and four national journals.

His last book Sports Injuries: Prevention, Diagnosis, Treatment and Rehabilitation was published by Springer in 2012 with the second edition published in 2015. Hıs new book on intararticular fracture will be published by Springer in 2018.

His major research interests are in the knee, shoulder, ankle, hip sports injuries and rehabilitation, arthroscopic and endoscopic surgery, basic science research in tendons and tendon injuries and knee arthroplasty since 1984.

He is Chairman of the Department of Orthopaedics and Traumatology since 2011 and the Chairman of the Department of Sports Medicine since 2001 at the University of Hacettepe, School of Medicine, Turkey. He currently works at the UFUK University, Dr Ridvan Ege Hospital as Chairman of the Department of Orthopaedics and Traumatology since January 2018.

Prof. Doral was the medical chief-of-staff of Galatasaray Sportive Club U20 in 2012-2014 and also the director of Hacettepe University Sports Medicine Centre between 1995-2017.

He was Board member (2003-2009), programme committee member and membership committee chairman (2007-2011) of the International Society of Arthroscopy, Knee Surgery & Orthopaedic Sports Medicine (ISAKOS) and also on the scientific board of European Society of Sports Traumatology Knee Surgery and Arthroscopy (ESSKA).

He was the president of TUSYAD (Turkish Society of Sports and, Knee, Arthroscopy) between 2002-2004 and currently serves on the Executive Council of the Turkish National Olympic Committee.

Prof. Doral served as the the president of the Turkish Society of Orthopaedics & Traumatology (TOTBID) between 2010-2011. He is the past-president of the European Federation of Orthopaedic Sports Traumatology (EFOST 2000-2003), Asia-Pacific Knee Society (APKS/Knee Section of APOA 2004-2006) and the Turkish Society of Sports Traumatology Arthroscopy and Knee Surgery (2002-2004), and the past chief-of-staff of the Medical Committee Turkish Federation of National Basketball Team.

He is the founder and current President of the Turkish Society of Sports Traumatology. He was honoured as the distinguished Visiting Professor to University of Pittsburgh School of Engineering in 2006 and Kentucky University in 2009. He is the current elected president of APOA (Asia Pacific Orthopaedic Association).

Prof. Jon Olav Drogset is Chair at the Institute of Orthopedics and Rheumatology at the Medical Faculty of the Norwegian University of Science and Technology.

Prof. Drogset is also an orthopedic surgeon at the Section for Arthroscopy and Sports Traumatology at the Department of Orthopedic Surgery at Trondheim University Hospital in Norway.

He has US high school diploma from Wilmington High School, Wilmington Delaware, USA, in 1977. He graduated from the medical school at the University of Oslo in 1985 after premedicine in Bochum, Germany.

He is a specialist in general surgery from 1995, sports medicine from 1995 and orthopedic surgery from 1998. His thesis was on results after surgical treatment of anterior cruciate ligament injuries at the Norwegian University of Science and Technology in 2006.

His main research interests are knee injuries with several publications on ACL injuries and cartilage repair. Prof. Drogset is the former President of the Norwegian Arthroscopy Association, the Norwegian Association of Sports Medicine, Scandinavian Foundation of Medicine and Science in Sports and the Norwegian Orthopedic Association.

Prof. Drogset is also a member of the ACL Study Group and he is the Team Doctor for Rosenborg FC. He was awarded the KSSTA Best Reviewer in 2016. He is a member of ESSKA and a member of the upcoming ethical committee in ESSKA.

Prof. Drogset is the Scientific President of the Centennial Congress of the Nordic Orthopedic Federation in Trondheim, Norway, scheduled for 2020.

Dr Carola F. van Eck earned her medical degree from the University of Amsterdam in 2008. She joined Dr Freddie H. Fu and his research team at the University of Pittsburgh as a post-doctoral research associate. Her research efforts resulted in a PhD degree in 2011. She stayed at the University of Pittsburgh for her orthopaedic residency training and subsequently completed a Sports Medicine Fellowship at the Kerlan-Jobe Orthopaedic Clinic in Los Angeles, California, under the direction of Dr Neal El Attrache.

Currently, she holds a position as assistant professor of orthopaedic surgery at the University of Pittsburgh.

Dr van Eck’s major research interests lie in the field of orthopaedic sports medicine and her research efforts have resulted in nine awards and honors, 68 national and international presentations, and 102 peer-reviewed and non-peer reviewed publications and book chapters.

Dr van Eck serves as an Editorial Board member of KSSTA, JISAKOS and AOJ. She is on the ISAKOS Publications Committee. She is also the Sports Medicine Section Editor of AP-SMART and she is a member of the Journal of Bone and Joint Surgery (JBJS) Social Media Advisory Board and Digital Product Users Group. She also serves as a peer reviewer for these and various other journals. She is an active member of ESSKA, RJOS, ORS, AANA, AAOS, NVA, AAHKS, AO Trauma, AOA, AOSSM and KJOC Alumni Foundation.

However, Dr van Eck’s true passion is being a team physician. She has served on the medical team for the Pittsburgh Penguins, the Los Angeles Rams, the Los Angeles Dodgers, the Oakland Athletics, the Los Angeles Kings, the Anaheim Ducks, Fullerton College Football, West Los Angeles College Football, Loyola Marymount University Athletics, Banning High School Football, and the United States Hockey League.Currently, she works as team physician for Robert Morris University with its 16 NCAA division I sports teams, as well as for the Pittsburgh Passion professional women’s football team, who have won the national championship two years in a row.

Turgay Efe

Prof. Lars Engebretsen is currently the Professor of Orthopedic Surgery at Oslo University Clinic and Head of Medical Sciences in the International Olympic Committee. Professor Engebretsen has published over 400 articles and book chapters, with a citation index (H-index) of 56.

He is among the world’s most productive in clinical, epidemiological and basic science research in the areas of general sports medicine, knee ligaments, cartilage and prevention of sports injuries and illnesses. He has received research grants and awards from many agencies and associations, including the National Institutes of Health, the Norwegian Council for Research in Science and Humanities, the Norwegian Ministry of Health, the American Orthopedic Society of Sports Medicine (AOSSM) and the International Olympic Committee. He and his group have won several research awards around the world, and he was inducted into the AOSSM Hall of Fame in July 2015 and became an ESSKA Honorary member in 2016 and ISAKOS Honorary member in 2017. He received the Nordic Prize in Medicine in 2016.

Prof. Engebretsen is involved with three research groups: Knee ligaments together with May Arna Risberg in Oslo and Robert LaPrade in Vail, Colorado, the Oslo Sports Trauma Research Center co-chaired with professor Roald Bahr and emphasizing prevention of injuries and diseases in sports, and the Oslo Cartilage Group, which encompasses research from the cell to rehab after surgery, involving molecular biologists, pathologists, radiologists, physiotherapists and orthopedic surgeons.

In 1997, the cartilage group performed the first knee joint chondrocyte transplantation in Norway. Since then, the group has had major emphasis on translational research. The group works closely with the Stem Cell group led by dr Brinchmann and has optimized chondrocyte and stem cell cultivation while at the same time developing surgical techniques for implantation. Professor Engebretsen has been the President of the Norwegian Sports Medicine Society, the Scandinavian Foundation of Sports Medicine and European Society of Sports Traumatology and Arthroscopy (ESSKA).

Prof. Engebretsen is or has been a board member of many other societies including, but not limited to, the Norwegian Society of Sports Medicine, the Scandinavian Foundation of Medicine & Science in Sports, the International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine (ISAKOS), the Orthopedic Research Society and International Knee Society. He is the Editor of the British Journal of Sports Medicine (IPHP edition), Associate Editor of Journal of Bone and Joint (the most prestigious journal in orthopedics) and on the editorial board of American Journal of Sports Medicine, Scandinavian Journal of Medicine and Science in Sports, Knee Surgery, Arthroscopy and Sports Traumatology, and The Knee and is a regular reviewer for all the major orthopedic and sports traumatology journals.

Karl Eriksson

Lucio Ernlund

Prof. João Espregueira-Mendes  completed his residency in Orthopaedic and Traumatology Surgery in 1994. He had the degree as Professor from Porto University and was the youngest PhD in Orthopaedics in Portugal. He did a scholarship in Orthopaedics at the Mayo Clinic in 1991.

Currently, he is the Medical Director of Clínica do Dragão – Espregueira-Mendes Sports Centre – FIFA Medical Centre of Excellence which is also an ESSKA and ISAKOS Official Centre.

He teaches at the Universities of Minho and Porto where is Chairman of Orthopaedics and Muscleskeleton System, he is responsible for postgraduate courses in Rehabilitation and Sports Medicine and Founder of Dom Henrique Research Centre. From 1998 to 2006 – 1st Director of Orthopaedics and Traumatology at São Sebastião Hospital; from 2004 to 2008 – President of the Portuguese Society of Arthroscopy and Traumatology (SPAT); from 2012 to 2014 – President of the European Society of Knee Surgery, Sports Trauma and Arthroscopy (ESSKA). At the moment, he is Chairman of Clínica do Dragão – Espregueira-Mendes Sports Centre, FIFA Medical Centre of Excellence; Chairman and Professor of the Orthopaedic Department of Minho University; Treasurer and Chairman of the Publications Committee of the International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine (ISAKOS); Board Member of the Patellofemoral Foundation; Board Member of FIFA MCE; Professor of Porto University – Co-Chairman of the Post-graduate in Sports Medicine and 3B’s/ICVS Senior Researcher – Minho University; President of the ESSKA Foundation in Luxembourg –  Founding President and Chairman of Dom Henrique Research Centre – Porto.

His numerous articles in the area of Orthopaedics and Sports Medicine are primarily associated with anterior cruciate ligament injuries, imaging evaluation (ligaments and patellofemoral) and rehabilitation. He is presently involved in tissue engineering projects involving ligament and cartilage stem cells.

His primary interest is in the treatment of knee, ligaments, cartilage and patella instability. He also invented the Porto Knee Testing Device (and Patella Testing Device) to measure the injury of knee ligaments in the MRI and it is already used on the 5 continents, the cartilage graft (Porto GUT) and the artificial meniscus – Porto meniscus (in partnership with 3B’s).

Julian Feller

Dr Francesco Franceschi earned his degree in medicine and surgery at the Medicine and Surgery at the Catholic University of Sacro Cuore in Rome in 1990, with 110/110 and praise.

From 1990, he attended the Department of Orthopaedics and Traumatology, obtaining specialisation in 1995. He continued his education with observerships around the world, in particular at  the Presbyterian Hospital in St. Antonio with Dr S.S. Burkhart and at the Hospital for Special Surgery with Dr Altchek.

Since 2000, he regularly visits the most updated orthopaedic centres in Europe and  the USA to refine his operative technique of  shoulder  and knee surgery.

From 1995, he worked at the University “Campus Bio-Medico” of Rome, where was named “Research Fellow” in 2000 and Chief of the “Upper and Lower limb Surgery” Unit in 2016.

He performs about 500 operations a year, in prevalence shoulder and knee arthroscopies and arthroplasties (both primary and revisions). His department is a accredited “ESSKA teaching centre”.

He invented and published numerous innovative techniques for the treatment of pathologies such as chondral lesions and rotator cuff tears. He is author of more than 70 indexed publications, 20 book chapters, and recently co-editor the latest edition of “Clinica Ortopedica”, the textbook adopted in a majority of Italian Universities to teach Orthopaedics at medicine and surgery courses.

Prof. Niklaus Friederick completed his medical school at the University of Berne, in 1981 and specialised in orthopaedic surgery at the University Balgrist, Zürich.

He has been the Chairman of the Department Orthopaedic Surgery, Hospital Bruderholz, from 1995 to 1998 as well as Chairman of the Department of Biomechanics, University of Basel, since 2008.

From 2013-2015, he was Senior Consultant at the Orthoklinik Dornach AG, University Hospital Basel, Switzerland.

Freddie Fu

Susanne Fuchs-Winkelmann

Alan Getgood

Laura de Girolamo

Dr Francesco Giron received his medical degree with honors from the University of Padova in 1990 and his PhD n “Clinica e Patologia degli Organi di Movimento” at the  University of Firenze in 2004.

He was the Director of Orthopaedic Service of  Villa Salus Hospital, Venezia, from January- July 2017. He has been an MD and Residency Thesis advisor for students/residents since 1995.

He is a member of the Italian Orthopaedic and Traumatology Society  (SIOT), International Society of Arthroscopy Knee Surgery and Orthopaedic Sports Medicine (ISAKOS), American Academy of Orthopaedic Surgeons (AAOS). International member, Italian Society of Knee Surgery, Arthroscopy, Sports Traumatology, Cartilage, and New Technologies  (SIGASCOT). AO Alumni Association (AOAA), European Society of Knee Surgery, Sports Traumatology and Arthroscopy, EKA (European Knee Associates).

He is on the editorial board of various journals such as: Journal of Sports Traumatology, Knee Surgery Sports Traumatology and Arthroscopy and Joints.

Dr Karin Grävare-Silbernagel is an Associate Professor at the Department of Physical Therapy, University of Delaware, Newark, USA.

At University of Delaware she runs the tendon research lab together with her colleagues from mechanical and biomedical engineering. The Tendon Research Group  is an interdisciplinary group working to advance understanding of tendon injuries and repair so that tailored treatments can be developed.

Dr Grävare-Silbernagel has been a clinician, researcher, and educator in the USA and Sweden. She has been a practicing physical therapist for over 25 years, mainly in orthopaedics and sports medicine. Her research focuses on tendon injuries, especially the clinical aspects of treatment, and evaluation.

Her research approach is to evaluate tendon health and recovery by quantifying tendon composition, structure, and mechanical properties, as well as patients’ impairments and symptoms. The focus is on how to prescribe exercise and physical activity as treatment in patients with painful tendinopathy and complete tendon ruptures.

Her research centres around the Achilles tendon and patellar tendon injuries. Her research is funded by the National Institute of Health, Foundation for Physical Therapy, Swedish Research Council for Sport Science, and Swedish Research Council.

She has published over 60 articles in peer-reviewed journals, has written several book chapters and has presented nationally and internationally. To view a list of her publications go to https://www.ncbi.nlm.nih.gov/sites/myncbi/karin.gravare%20silbernagel.1/bibliography/44096793/public/?sort=date&direction=ascending

Dr Bjornsson Hallgren is an orthopaedic consultant and upper extremity surgeon working at the University Hospital of Linköping, Sweden.  Her special scientific interest and PhD is in the field of shoulder pain and dysfunction. She supervises  several PhD students investigating upper extremity surgery and active in presenting at both national and international conferences.

She has been a reviewer for the KSSTA journal since 2015 and an Editorial Board member since 2016.

She was awarded by the Swedish orthopaedic society, SOF, for the best orthopaedic PhD thesis 2012 and the best national paper by the European elbow and shoulder society, SECEC, 2013.

She has been the Secretary of the Swedish shoulder and elbow society since three years and involved in the process of writing national Swedish guidelines considering subacromial pain and rotator cuff tears.

She is also the co-founder of a Nordic scientific collaboration network performing randomised multicentre studies on shoulder pain, calcific tendinitis and rotator cuff tears.

She has published 12 articles in high impact journals, including  BMJ on the subject of subacromial pain, specific exercises,  different aspects of rotator cuff tears and outcome measures. Board member of the PARCS steering committee in Oxford, a study on patch augmented rotator cuff surgery since 2017.

She is a current member and former secretary of the Swedish orthopaedic trauma society with experience of both trauma related fractures and soft tissue injuries. Clinically, she focuses on both open and arthroscopic upper extremity surgery and ultrasound scanning as a diagnostic tool  for shoulder pain.

Prof. Michael E. Hantes is a professor of orthopaedic surgery at the University of Thessaly, Larissa, Greece.

The clinical practice and research of Prof. Hantes focuses on knee, shoulder, and ankle. He was the president of the Greek (Hellenic) Arthroscopic Association and Sports Medicine (2012-2014). For over 20 years, Prof. Hantes has been an active member of ESSKA, where he served as Treasurer (2014-2018) and he is the current ESSKA General Secretary.

Prof. Hantes is the team physician for the National Greek Volleyball team. He completed his medical degree at the Aristotle University of Thessaloniki in 1990 and trained in orthopaedic surgery at the Ioannina University Hospital followed by fellowship training in sports medicine and knee arthroscopy with Prof. Hans Pässler (ATOS Klinik Center for Knee, Foot Surgery and Arhroscopy, Heidelberg- Germany) and Upper Extremity and Knee Arthroscopy with James Chow (Orthopaedic Center of Mount Vernon IL, USA).

Prof. Hantes received the Resident/Fellow Essay Award in 2002 from AANA (Arthroscopy Association of North America). He was selected for the ESSKA-APKASS (Asia-Pacific Knee, Arthroscopy and Sports Medicine Society) travelling fellowship in 2006 and was the Godfather for the 2018 ESSKA-APKASS Travelling Fellowship. Prof. Hantes has authored over 70 peer-reviewed articles and numerous book chapters.

He is the founder of the Larisa Arthroscopy and Minimally Invasive Centre (LAMILC) http://www.ortho-uth.org/lamilc/ and organises seminars in arthroscopic surgery with the aim of educating young physicians in the field of arthroscopic surgery and sports medicine on a regular basis.

He is member of many scientific societies and is on the editorial board of KSSTA, AJSM and an associate-editor of JBJS Case Connector.

Arsi Harilainen

Dr Elmar Herbst is currently a resident specialising in sports medicine at the Department of Orthopaedic Sports Medicine, Technical University Munich, Germany (with Prof. Andreas B. Imhoff) and the Department of Trauma, Hand and Reconstructive Surgery, University Hospital Münster, Germany ( with Prof. Michael Raschke).

He completed his PhD in musculoskeletal sciences at the Medical University Innsbruck, Austria, and did a research fellowship focusing on the anterolateral complex of the knee and the influence of the posterior tibial slope and meniscus tears on knee kinematics at the University of Pittsburgh, USA, with Prof. Freddie H. Fu and Prof. Volker Musahl.

His main scientific interests are on rotatory knee instability, knee anatomy, biomechanics and return to sports following ACL reconstruction represented in several related publications. His research was awarded during various national and international conferences. Most recently, his publication on the timing of ACL reconstruction won the KSSTA-Jón Karlsson Young Researcher Award in Clinical Science during the 2018 ESSKA Congress in Glasgow.

Dr Herbst is member of the education committee of AGA – Society for Arthroscopy and Joint Surgery, the ligament and public relations committees of the DKG – German Knee Society, and the scientific committee of ISAKOS – International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine.

Dr Herbst joined ESSKA in 2014 and serves as a reviewer for KSSTA since 2015. Since 2017, Elmar Herbst is editorial board member of KSSTA and was awarded Reviewer of the Year in 2017.

Siegfried Hofmann

Dr Yuichi Hoshino graduated from Hokkaido University School of Medicine in 2000 and then completed his orthopaedic residency and postgraduate education at Kobe University, earning his PhD in 2008.

From 2009 to 2011, he did an international research fellowship at the University of Pittsburgh. He, then, worked as deputy director at Kobe Kaisei Hospital until he moved back to Kobe University as an assistant professor in 2017.

His clinical practice focuses on sport- related knee injuries. He performs around 100 ACL reconstructions per year mainly using the double bundle technique. In addition to his clinical duties, he has served as the team physician for several sports teams.

His research interests include knee biomechanics and kinematics, especially after ACL and other related injuries. He has developed some in-vivo knee kinematics measurement systems for the pivot-shift test and used them for several clinical researches, including an international multi-center study, named the PIVOT study which was funded by an ISAKOS/OREF grant. He also performed several in-vitro studies to advance the arthroscopic surgical techniques related to the ACL reconstruction.

He has authored 52 peer-reviewed articles and four book chapters. He has given over 70 international meeting presentations since 2007. He received the Best Poster Award in 2017 at the ORS annual meeting and the Jan I. Gillquist Scientific Research Award at the 11th Biennial ISAKOS Congress. He is an editorial board member of the KSSTA journal and an active member of several international orthopaedic societies, including AAOS, ORS, ISAKOS, ESSKA, APKASS and ACL study group. He has also served as a scientific committee member at the ISAKOS meeting since 2015.

Christophe Hulet

Dr Miguel A. Ruiz Ibán is currently the Head of the Shoulder and Elbow Unit in the Department of Orthopedic Surgery and Traumatology in Hospital Universitario Ramón y Cajal, in Madrid, Spain.

He received his medical degree in Universidad Autónoma de Madrid and completed the Orthopedic Surgery Residency Programme at the Hospital Universitario Ramón y Cajal.  He completed his PhD, focused in the biomechanics of the lower lumbar spine and pelvis, at the Universidad de Alcalá de Henares, Madrid. He also obtained a Master’s degree in Clinical Management of Specialist Care Units at the European Institute of Health and Social Wellbeing. He is an active ESSKA member since 2010.

His current research interests include both basic and clinical research in two main topics: shoulder surgery and musculoskeletal pain management. His shoulder research currently focuses on epidemiology and outcomes of shoulder instability surgery and rotator cuff disease. He has also extensive research background in stem cell therapies, meniscal repair and regeneration, growth factor expression and effects in the healing tissue, knee and hip injuries in the young population and tromboprofilaxis in the orthopedic and trauma patient.

He has also taken part in many randomized controlled trials as principal investigator and has been the recipient of different research grants by private and public institutions.

Dr Ruiz Ibán has lectured extensively at national and international meetings. He has authored numerous books, chapters and abstracts. He has published more than 50 papers in indexed, international peer reviewed journals, including Arthroscopy, American Journal of Sports Medicine, KSSTA, Clinical Drug Investigation, Orthopedics and others. He currently serves on the editorial board of KSSTA and World Journal of Orthopedics; he also regularly reviews for many other journals.

Prof. Andreas Imhoff graduated  from Basel University in 1980. He started his residency in General Surgery and Traumatology in Davos, Switzerland, under the guidance of Prof. Peter Matter and in general surgery, traumatology and knee surgery at the University Hospital Bruderholz-Basel under the guidance of Prof. Werner Müller in 1982.

He completed his Orthopedic Residency at the Balgrist University Hospital, University of Zurich under the direction of Prof. Adam Schreiber, Prof. Hans Zollinger, Prof. Christian Gerber between 1983 and 1996, after 1987 as a head of different departments for knee, shoulder and sports medicine. A one year exchange fellowship brought him to the department of orthopedic surgery in the Center of Sports Medicine at the University of Pittsburgh, PA, USA, under the direction of Prof. Freddie Fu, Prof. Jon JP Warner, Prof. Chris Harner but also at the Musculoskeletal Research Center, University of Pittsburgh under the direction of Professor Savio LY Woo between 1994 and 1995.

He was elected as a Professor of Orthopedic Surgery and Arthroscopy at the faculty Medical school and faculty School of Sport Science and Health, Technical University, Munich, to serve as director and chairman of the Department of Orthopedic Sports Medicine since 1996.

Prof. Imhoff is an active member of the AGA (German Society of Arthroscopy and Joint Surgery) who has now 4,500 members. He was a founder in 1983, congress chairman 1999, president 2000-2003, general secretary and now still member of the executive board. He will be again congress chairman 2017.

He is on the board of directors of the DGOOC (German Society of Orthopaedics), DGOU (German Society of Orthopaedics and Traumatology) since 1996. He is also member of ISAKOS (International Society of Arthroscopy, Knee Surgery and Orthopedic Sports Medicine), started as founding member of IAA/ISK in October 1994, now member of the board and different committees since 1996.

He is the chairman of the ISAKOS shoulder committee since 2015. He is also member of several societies like SGO (Swiss Society for Orthopaedics), ESSKA (European Society of Sports Traumatology, Knee Surgery and Arthroscopy), SESEC (European Society for Surgery of the Shoulder and the Elbow), AOSSM (American Orthopedic Society for Sports Medicine), DVSE (German Society for Shoulder and Elbow), DGU (German Society for Traumatology), SICOT (Société Internationale de Chirurgie Orthopédique et de Traumatologie), AFOR (Association of Orthopedic Research) member of the board since 2010, DKG (German Knee Society) member of the board since 2012.

Since 1999, he has received various awards from all over the world.

He is honorary member of the Arthroscopy Association of North America AANA since 2004, Miembro Honorario, Sociedad Argentina de Cirurgia de Hombro y Codo 2006, Malaysian Federal Honorary Award 2010, honorary member of AGA 2013, honorary member of Indian  Arthroscopic Society IAS 2014.

He serves as on the editorial board of journals like Arthroscopy, Operative Orthopaedics and Traumatology, Journal of Shoulder and Elbow Surgery, Knee Surgery, Sports Traumatology, Arthroscopy (KSSTA), American Journal of Sports Medicine  and Open Access Journal of Sports Medicine as an editor in chief. He edited 35 books and published over 386 journal articles, cited in pubmed.

Dr Eivind Inderhaug is a consultant orthopaedic surgeon specialising in knee surgery and sports medicine at Haraldsplass Deaconess Hospital, Bergen, Norway.

Dr Inderhaug graduated from the University of Oslo and has done his post-graduate training in Bergen. In addition to his medical degree, Dr Inderhaug has a Master in Health Economics, Policy and Management from the University of Oslo. A special interest is in cost-efficiency analyses and evaluation of health-care programmes.

Dr Inderhaug defended his PhD thesis Changing paradigms of ACL surgery in 2015 and later undertook a post-doctoral research fellowship at Imperial College, London, under the supervision of Prof. Andrew A. Amis. His research interests include clinical studies on the knee and shoulder surgery and has lately expanded to include anatomical and biomechanical perspectives.

Directing a group of researchers from orthopaedics, radiology, physiotherapy and engineering, Dr Inderhaug is supervising medical and PhD students.

He is a member of NOF, AAOS, ESSKA and ACL Study Group. He has received several prizes and grants for past and ongoing research projects. With an extensive list of publications and book-chapters, he regularly attends international conferences and meetings as an invited speaker and instructor. In addition being a KSSTA editorial board member, Dr Inderhaug also serves on the AJSM editorial board for social media.

Prof. Takanori Iriuchishima specialises in knee surgery, ACL anatomy, ACL surgery, arthroplasty and sports medicine.

He was assistant professor at the Department of Functional Morphology, Nihon University School of Medicine, Japan, and also visiting professor at the Tokyo Metropolitan University.

He is a member of ISAKOS, JOA (Japan Orthopedic Association), JOSKAS (Japanese Orthopedic Society of Knee Arthroscopy, and Sports Medicine) and also on the Editorial Board of the KSSTA journal.

Prof. Timo Jarvela graduated from Tampere University Medical School, Tampere, Finland, in  1991. He has been Associate Professor of Orthopaedic and Traumatologic Surgery since March 1, 2009, Tampere University Medical Faculty, Tampere, Finland.

He is currently working at the Sports Medicine and Arthroscopic Centre Mehiläinen in Tampere, Finland.

He has published 50 international publications and 75 abstracts focusing mainly on the clinical results of ACL reconstructions, especially controlled randomised trials comparing double-bundle and single-bundle ACL reconstructions.

He has supervised three academic dissertations and six thesis. He has been an opponent for one academic dissertation and a reviewer for three academic dissertations.

He is member of the ACL Study Group, Magellan Society, ESSKA, ISAKOS and is on the Editorial Boards of the American Journal of Sports Medicine, and KSSTA journal.

He comepleted the EFORT Traveling Fellowship in Switzerland in 1999, the ESSKA Traveling Fellowship in Asia (Singapore, Hong Kong, Japan) in 2004, and the Sports Medicine and Research Fellowship at the University of Pittsburgh Medical Center in 2001 and 2005-2006.

He has won the Best Paper Award at the Annual Finnish Orthopaedic Meeting three times, the KSSTA Best Reviewer Award in 2014 and the Hughston Award in 2018.

Prof. Jarvela has organised 20 international courses or symposiums, given over 100 invited international presentations, 10 invited international live surgery demonstrations, and hosted 50 international visitors or fellows including the traveling fellows from Asia Pacific in 2008 and from SLARD in 2012.

Prof. Mislav Jelic graduated at the School of Medicine, University of Zagreb, Croatia, where he obtained his PhD in 2001. Between 1996 and 1999, he was a postdoctoral associate at the Laboratory for Mineralized Tissues, and a teaching assistant at Department of Anatomy, School of Medicine, University of Zagreb.

He finished his residency in orthopaedic surgery at the Department of Orthopaedic Surgery, University of Zagreb, in 2003 where he works as a staff member since.

He obtained an Assistant Professor title in 2009 and Associate Professor title in 2015. His research interest is related to biological reconstruction of the bone and articular cartilage.

He published some of the first clinical cases of the biological reconstruction of the skeleton with BMPs. He received several awards in the field including the ESSKA Best Poster Award in 1994 and the Hughston Award in 2009 together with a group of authors.

His clinical interest includes knee surgery with the greatest scientific interest in the regeneration of the articular cartilage. Prof. Jelic is the head of the biological reconstruction unit at the Department of Orthopaedic Surgery, University of Zagreb. He was also selected for four travelling fellowships: EFORT in 2001, ICRS in 2004, ESSKA-AOSSM in 2011 and Knee Society Insall TF in 2014.

His publications have been cited more than 2,000 times. As a part of his scientific work, he has been or currently is a leader of several projects mostly focusing on ACL reconstruction and articular cartilage repair for which he has received grants such as the Croatian Institute of Technology Grant, FP-7, etc. He is a co-inventor on four patent applications.

Prof. Joerg Jerosch is the current Head of the Orthopedic and Trauma Department of the Johanna-Etienne-Hospital in Neuss, Germany.

In 2018, he published some basic research paper in KSSTA about the proprioceptive capability of the shoulder joint, which is still one main interest of his work. His clinical and scientific interest is mainly in shoulder surgery as well as replacement surgery. He introduced the ALMI (antero-lateral minimal invasive approach) as an MIS approach for hip-replacement in 2003.

He developed shoulder resurfacing (Capica, Implantcast) for the shoulder and he was the designing surgeon of the MiniHip short stem design (Corin).

In 2012,  he developed and published a classification of a different short-stem design in total hip replacement, which is now widely-used internationally.

In recent years, his special interest is in bone preserving hip (short-stem design), knee and shoulder replacement (stemless shoulder replacement) with special interest in preserving the bone in the long term.

He has authored or co-authored almost 300 scientific papers listed in Medline. He has published 53 books on different field of orthopaedic surgery. He has been a member of the KSSTA Editorial Board since 1993.

 

Prof. Mustafa Karahan is an internationally-active orthopaedic surgeon working mainly on sports traumatology, knee surgery, shoulder surgery and arthroscopy. He is currently Adjunct Professor of Orthopedics at the Acibadem Mehmet Ali Aydinlar University, Istanbul, where he is actively involved in CASE (Centre for Advanced Simulation and Training) which hosts the European Basic Arthroscopy Course and the European Basic Arthroplasty Course.

After graduating from Hacettepe University in Ankara, Prof.  Karahan completed his residency at Marmara University in Istanbul, Turkey. He worked at the university from 1988 to 2012 until achieving full professorship where he founded the Marmara University Sports Sciences and Health Research Centre in 2004.

He is well-known for implementing a teaching method in arthroscopic surgery on bovine knee and is the current President of the Turkish Shoulder and Elbow Surgery Society, as well as the past-president of the Turkish Sports Traumatology Association.

Prof. Karahan is an executive Board Member of ESSKA as well as the editor of the ESSKA Academy, ESSKA’s online teaching portal. He has published more than 70 scientific articles in peer-reviewed journals and has made over 150 scientific presentations. He has authored multiple book chapters and was chief editor of the ESSKA-Springer book Effective Training of Arthroscopic Skills and co-editor of Knots in Orthopedic Surgery—Open and arthroscopic.

He was Godfather of the ESSKA-APKASS Travelling Fellowship in 2016. He is on the executive Board of ESA, ESSKA’s shoulder and elbow section and member of the EKA and ESMA Sections. He is an Editorial Board Member of the American Journal of Sports Medicine (AJSM), the Journal of Arthroscopy, KSSTA and Journal of ISAKOS.

Oliver Kessler

Christoph Kittl

Burt Klos

Dr Gunnar Knutsen is currently a Consultant Orthopaedic Surgeon at the University Hospital North Norway. He was registered as a specialist in general surgery in 1990 and in orthopaedic surgery in 1994.

He has been an Assistant Professor 1999- 2008 and Associate Professor 2008-2016 at the Academic: UIT the Arctic University of Norway.

His main interests are osteochondral repair, arthroscopic surgery, sports traumatology, osteoarthritis and knee replacements including revision surgery. He has been working clinically and scientifically with cartilage injuries and repair since the mid nineties and is the leader of a Norwegian randomized trial comparing ACI and microfracture.

Further, his supervised a PhD candidate in another cartilage RCT comparing AMIC and ACI-C.

He was on a sabbatical from my post in Norway 2002-2003 working with Prof. James Richardson in Oswestry UK (Robert Jones and Agnes Hunt Orthopaedic and Hospital. 

Prof. Baris Kocaoglu is an orthopaedic surgeon who mainly focuses on sports medicine.

He has been working for a Turkish Sports Medicine, Knee Surgery and Arthroscopy Society. He has organised many cadaver courses and various national and international meetings on sports medicine.

He currently works as a professor in the sports medicine division at the Acibadem University Faculty of Medicine, Istanbul, Turkey. He is also the general secretary at of Turkish Shoulder and Elbow Society.

He comepleted his sports medicine fellowship at the University of Iowa Hospitals and Clinic, Iowa City, USA, between 2006-2007.

According to WOS, his H-index is 15.

Andrey Korolev

Dr Robert F. LaPrade is a complex orthopaedic knee and sports medicine surgeon who practices at the Steadman Clinic in Vail, Colorado, USA.  He serves as the chief medical officer and co-director of the Sports Medicine Fellowship Program at the Steadman Philippon Research Institute.

Dr LaPrade is known as a specialised clinician scientist who has utilised his comprehensive research on sports medicine injuries to improve patient care and invent novel ways to treat knee problems.  Many of the surgeries that he has devised have been performed worldwide.

Dr LaPrade has special expertise in treating posterolateral knee injuries, PCL tears, revision ACL reconstructions, meniscal repairs and transplants, MCL injuries, knee dislocations, knee osteotomies, fresh osteoarticular allografts, and other difficult complex and revision injuries.

Dr LaPrade has published more than 425 peer-reviewed scientific manuscripts, 100 book chapters, and has given over 1,000 professional presentations, symposia, and instructional course lectures.  Dr LaPrade has been on the AJSM Editorial Board since 1998 and the KSSTA Editorial Board since 2007.  He and his team have won many awards,  including the Trillat Young Investigator Award from ISAKOS (twice), J. Albert Key Research Award from the Mid-America Orthopaedic Association, 3M Excellence in Clinical Research Award from the AOSSM, Excellence in Research Award from the AOSSM (3 times), Achilles Award from ISAKOS (twice), Cabaud Award from the AOSSM (twice), Nicola Foundation Young Investigator, Best Meeting Poster and Best Paper in Ligaments and Biomechanics  awards from ESSKA, and an OREF Kappa Delta Award, considered the “Nobel Prize of Orthopedics”.

In addition, Dr LaPrade is recognised internationally as an outstanding mentor and teacher, having been awarded several teaching awards, including four annual teaching awards given by fellows of the Steadman Clinic Sports Medicine Fellowship programme and has mentored international fellows from all continents.

Matthias Lahner

Bruce Levy

Dr Albert Linis an Associate Professor of Orthopaedic Surgery and the Associate Chief of Sports Medicine at the University of Pittsburgh, USA.  He specialises in the care of athletes and shoulder conditions, and has extensive experience with shoulder arthroscopy, shoulder arthroplasty, and complex reconstructive and open surgery of the shoulder as well as arthroscopy of the knee.

He is a graduate of Harvard Medical School and completed his residency in Orthopaedic Surgery at the Harvard Combined Orthopaedic Residency Program, as a well as fellowships in Sports Medicine at the University of Pittsburgh Medical Center and Shoulder Surgery at Harvard University.

Dr Lin is an active member of AAOS, AOSSM, ASES, and ISAKOS, and is an active committee member of the shoulder and elbow committee of AAOS and the education committee of ASES.  He is a regular invited faculty member for AAOS, ASES, AOSSM, AANA, ISAKOS, and MASES.  In addition, he currently serves on the editorial review board of KSSTA as well as Annals in Joint and is a reviewer for JAAOS, JSES, AJSM, KSSTA, and TSES.

Dr Lin has published more than 75 articles, abstracts, and book chapters related to shoulder instability, rotator cuff pathology, shoulder arthroplasty, and complex shoulder conditions, and regularly presents his research at international and national meetings.

He is actively involved in residency and fellowship education and currently serves as the Associate Program Director of the UPMC Sports Medicine Fellowship.

Additionally, he is the head orthopaedic team physician for Duquesne University and Pittsburgh Central Catholic High School.  His current research interests include clinical research related to rotator cuff and shoulder instability surgery as well as shoulder arthroplasty, and basic science research in the areas of robotics and biomechanical research following shoulder instability and in vivo kinematics of the shoulder following superior capsular reconstruction and reverse total shoulder arthroplasty.

Prof. Martin Lind has clinical expertise in complex knee surgery with special interest in patellofemoral instability, multi-ligament instability, ACL revision surgery and cartilage repair.

He has 25 years of research experience with present activities within patellofemoral instability, multi-ligament instability, ACL revision surgery, tissue engineering including cartilage repair and injury prevention.

He was awarded fellowships at Stanford University, USA, in 1997 and Melbourne, Australia, in 2007.

His scientific focus is currently within clinical sports traumatology including cartilage and meniscus injuries, patella-femoral instability, treatment of multi-ligament injuries, ACL reconstructions and ACL revision surgery, the development of tissue engineering and transplantation based treatments for cartilage and bone repair,  epidemiological research on ACL injuries and their treatment in national clinical databases, sports injury prevention studies for running and team handball related injuries (232 publications).

Sverre Loken

Olaf Lorbach

Sebastien Lustig

Henning Madry

Prof. Nicola Maffulli is a Consultant Orthopaedic and Sports Injury Surgeon who has published more than 1,100 peer reviewed articles and 12 books on Orthopaedic Surgery and in Sports Medicine.

Prof. Maffulli is particularly interested in the physiopathology of sports injuries, including anterior cruciate ligament and tendon injuries, and great expertise in knee and foot and ankle arthroscopy.

An ESSKA Travelling Fellow in 1997, he was Professor of Trauma and Orthopaedic Surgery at Keele University School of Medicine (2001-2008), Centre Lead and Professor of Sports and Exercise Medicine, at Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London (2008-2013), and has now taken up the Chair in Trauma and Orthopaedics in Salerno University School of Medicine, Italy, maintaining an Honorary Professorships at Queen Mary University of London and at Keele University School of Medicine.

A keen athlete in his younger days, his old dream of going to the Olympics has been granted in London: he was the Field of Play doctor for the Olympic Wrestling Tournament, and lead a group of seven orthopaedic surgeons to administer the Orthopaedic Foot and Ankle care for both the Olympics and the Paralympics.

A Past President of the Sport and Exercise Section of the Royal Society of Medicine (2011-2012), and of the European Federation of the National Societies of Orthopaedic Sports Trauma (EFOST) for the period 2012-2014, at present he leads the Italian Muscle Ligaments and Tendons Society.

Prof. Maffulli has described more than 40 new surgical techniques in knee, foot and ankle and sports surgery. Many have now become standard practice.

Soft tissue problems constitute the major focus of Prof. Maffulli’s research, which has resulted in him being awarded the title of ‘King of Tendons’ by the Italian lay press.

Fabrizio Margheritini

Georg Matziolis

Prof. Hermann Mayr graduated from the Medical School, University of Munich, in 1983. During his residency, he was trained at the Hospital Fuerstenfeldbruck, Germany, the Klinikum Bogenhausen, Munich, Germany, and the University Hospital Basel, Switzerland.

In 1989, Prof. Mayr received his board certification as an orthopaedic surgeon and was then promoted to a consultant one year later.

Since 1991, he has headed the medical staff for the German National Alpine Ski Team. Prof. Mayr joined the Orthopaedic Surgery Munich Centre as a founding partner and senior specialist from 2003 to 2015.

In 2007, he acquired the PhD and postdoctoral lecture qualification.

Between 2007-2009, he was assistant professor at Halle University. He then became a research associate at the Department of Orthopaedic and Trauma Surgery, University of Freiburg, in 2010, and was appointed professor in 2012.

To date, he is in charge of various scientific projects and holds numerous patents. One of his surgical specialties is ligament surgery and endoprosthetics of the knee joint. In this field, he has multiple research projects and a variety of peer-reviewed publications.

Prof. Mayr was president of the Society of Arthroscopy and Joint Surgery (AGA) from 2009 to 2011 and president of the German Knee Society from 2012 to 2015.

From 2016–2018, he was an ESSKA Board member and Chair of the European Sports Medicine Associates (ESMA Section).

In January 2016, Prof. Mayr became Chief Physician of the Department of Knee, Hip and Shoulder Surgery at the Schoen Clinic, Munich, Harlaching, as well as Head of the Medical Care Centre, Munich, Harlaching.

Dr Khaled Meknas has broad experience in arthroscopic surgery of the knee, shoulder, ankle, and elbow. His special interest is in sports injury treatment, tendon disorders, shoulder and knee arthroplasty. Currently, he is associate professor at the Arctic University of Norway and  consultant orthopedic surgeon at the University Hospital of North Norway.

He has several publications on tendinopathy and its relation to osteoarthritis in the hip, shoulder and knee. Additionally, he has published on the surgical treatment of tendinosis of the elbow, shoulder and Achilles tendon using microtenotomy. Retro-trochanteric pain syndrome and its ethological factors related to tendinopathy is a focus of his research.

He has made innovative contributions to his own field such as his team’s work from 2003 was the first publication that ascribed the role of internal obturator tendon in retro-trochanteric pain syndrome.

He worked with the development of surgical technique from open surgery to endoscopic surgery and discovered the usefulness of microtenotomy of the small rotators in the hip in patients with retro-trochanteric pain syndrome.

He has been a KSSTA reviewer since 2009.

Jacques Menetrey

Ferran Montserrat

Dr Caroline Mouton studied biomedical engineering in Nancy, France and achieved her PhD at the Sports Medicine Research Laboratory,  Luxembourg Institute of Health. She defended her thesis in 2016 at the Medical Faculty of Saarland University, Germany,  on multi-directional knee laxity measurements in healthy subjects and ACL-injured patients.

Dr Mouton currently works as the scientific co-ordinator of the Department of Orthopaedic Surgery,  Centre Hospitalier de Luxembourg,  headed by Prof. Romain Seil and Prof. Dietrich Pape. She is in charge of organising clinical research from idea to publication. Hence, an important part of her work consists of conducting clinical studies and educating young clinicians. Other responsibilities include standardisation of patients follow-up, certifications and partnerships.

Dr Mouton’s scientific work deals with various aspects of ACL injuries including the improvement of their diagnosis, the understanding of patient profiles with a recent focus on children and concomitant injuries. She has published almost 30 publications and made 50 communications in national and international congresses. She performs more than 10 reviews yearly for three of the top-10 orthopaedic journals, is an editorial board member of the KSSTA and was awarded the Best Reviewer Award of Journal of Experimental Orthopaedics in 2016.

In 2018, her team was nominated for the Theo van Rens Best Paper Award at the 18th ESSKA Congress in Glascow for their work on ramp lesions of the medial meniscus. The same year, Dr Mouton started to act as co-chair of a multi-centric symposium for the French arthroscopic society (SFA) and as a vice-chair of the Basic Science Committee of ESSKA. With the latter that she integrated in 2016, she edited the booklet Clinical Research Tool Kit aiming to provide surgeons and researchers with advice to build and complete clinical studies. At the latest biannual congress, the committee was awarded as the most active group award for the period 2016-18.

Giulio M.M. Muccioli

Dr Takeshi Muneta is professor emeritus, Tokyo Medical and Dental University, Tokyo, Japan. He ran the Department of Joint Surgery and Sports Medicine, Graduate of Medical School, Tokyo Medical and Dental University from 2000 to 2017.

Dr Muneta specialises in knee and sports medicine. He emphasises the importance of the muscle skeletal pain and the subjective evaluation from the patient. He moved to one of the Disaster Medical Center in Japan as the director, however, he is still active in clinics and surgeries.

Dr Muneta graduated from Tokyo Medical and Dental University in 1979. He also completed his primary medical education at Tokyo Medical and Dental University, Medical Hospital. He worked as the chief of knee and sports medicine group at the Medical Hospital of Tokyo Medical and Dental University from 1992 to 2017. He studied at University of Minnesota from 1990-1991 as a research fellow with the research theme of the effect of dynamic loading on healing tendon. Dr Muneta was selected as an AOA/JOA Travelling Fellowship in 1999.

Dr Muneta’s major research interest lies in ACL injury and surgeries, clinical outcome from the patient’s aspect, meniscus preservation and pain management. Dr Muneta is author of over 240 peer-reviewed articles. He started a two-bundle hamstring ACL reconstruction using Endobuttons in 1994, and reported his preliminary clinical outcome in the Journal of Arthroscopy in 1999.

He is involved in the Editorial Boards of KSSTA, JISAKOS, Journal of Orthopaedic Science and AP-AMART, the Journal Annals of Joint.
He worked as the congress president of the Japanese Arthroscopy Association in 2008, Japanese Society of Cartilage Metabolism in 2015, Japanese Society of Clinical Biomechanics in 2015, and Japanese
Society of Clinical Sports Medicine in 2016. He was also president the congress of Japanese Orthopaedic Society of Knee, Arthroscopy and Sports Medicine in 2018.

Thomas Müllner

Wolfgang Nebelung

Katarina Nilsson-Helander

Dr John Nyland is a sports-certified physical therapist, athletic trainer and strength and conditioning specialist.  He is a member of ESSKA, the Sports and Orthopaedic Sections of the American Physical Therapy Association, the National Athletic Trainers’ Association, the American College of Sports Medicine, and the National Strength and Conditioning Association.  He currently serves as professor and Program Director for the Master of
Science in Athletic Training Program at Spalding University in Louisville, Kentucky, USA.

He is an International Editorial Review Board member for KSSTA, the Journal of Orthopaedic and Sports Physical Therapy (JOSPT), Arthroscopy:  The Journal of Arthroscopic and Related Surgery, the Journal of Athletic Training, the Turkish Journal of Physiotherapy and Rehabilitation, and Case Reports in Orthopedics.

Dr Nyland is President of the JOSPT — Movement Science Media Board of Directors and serves as a rehabilitation consultant with the International Grande Hospital in Kathmandu, Nepal. He is a past recipient of the Excellence in Education Award from the Sports Section of the American Physical Therapy Association and the John Joyce Award from the International Society of Arthroscopy, Knee Surgery, and Orthopaedic Sports Medicine.

He has authored or co-authored 180 peer reviewed papers and 35 book chapters, developed the books Clinical Decisions in Therapeutic Exercise: Planning and Implementation and Innovations in Knee Rehabilitation and authored a home study course entitled Therapeutic Strategies for Developing Neuromuscular Control in the Kinetic Chain.

Dr Nyland served on the 1996 and 2008 USA Paralympic games sports medicine staff as an athletic trainer and physical therapist, and as an International Para-Archery Classifier in 2012 and 2016.

Dr Mitsuo Ochi is an orthopaedic surgeon, having received more than 150 international invitations for lectures, and has published over 500 English articles in the past. His professional interests lie in orthopedics, regenerative medicine, and sports medicine. He has developed a 3-dimensional cultured autologous chondrocyte implantation method, for a cartilage defect in the knee for the first time in the world. This procedure has become eligible for public insurance coverage in Japan since 2013. He has also developed magnetic targeting injection procedure as a less invasive therapy for cartilage repair. This procedure is also effective in the enhancement of regeneration after tumour resection of urinary bladder or esophagus etc.

He assumed his current position as the President of Hiroshima University since 2015. His professional/research interests lie in the follows fields: orthopaedics, regenerative medicine and sports medicine. He has been an ESSKA member since 2012 and also the Society President of Japanese Orthopaedic Society of Knee, Arthroscopy and Sports Medicine (JOSKAS).
He is an ACL Study Group Member, an Honorary Member of Arthroscopy Association of North America, and an Ambassador of The Bone and Joint Decade.

He served as a professor and Chairman of the Department of Orthopaedic Surgery at Hiroshima University from 2002 to 2016. He was the first president of Asia-Pacific Knee, Arthroscopy and Sports Medicine Society (APKASS) in 2009. He was a Thorndike Visiting Lecturer from 2009 to 2010 at MGH Harvard University. He received many awards including the John J. Joyce Award (twice), the President’s Prize of the Science Council of Japan,  the Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology, the Minimally Invasive Endoscopy Prestigious Doctors Award, the Minister of Health Labour and Welfare Award as well as the Medal with Purple Ribbon from the Japanese government.

Dr Geert Pagenstert studied in Munich (LMU) and Boston (Harvard) and received the German and US- Medical (ECFMG) License in 2000. He became board certified Orthopedic Surgeon of Switzerland in 2005. I

n 2009, he was elected Vice-Chairman of the Department of Orthopaedic Surgery, University Clinics of Basel, Switzerland. His main clinical and research interests are the knee and lower extremity. He published more than 200 papers in peer-reviewed journals and book chapters and received the “Venia legendi” (Professorship) of the University of Basel in 2013. For more effective specialized clinical care, he changed in 2018 to the Clarahof Clinic and Merian-Iselin-Hospital of Orthopaedic Surgery in Basel. Since years, this high-volume hospital is listed number one or two in performing orthopaedic surgical procedures in Switzerland.

Half of Dr Pagenstert’s work time is dedicated to orthopaedic basic and clinical research as group leader of the Department of Clinical Research, University of Basel, member of the Laboratory of Biomechanics, University of Basel, and Director of the Knee Institute Basel.

He is currently co-editor of the international Journal Archives of Orthopaedic and Trauma Surgery and an active member of other editorial boards of international journals. He was president of the Swiss Society of Orthopaedic Sports Medicine 2012-2016 and is continuously active in the board of several other national and international orthopedic societies.

Geza Pap

Dietrich Pape

Thilo Patzer

Christopher Pearce

Luigi Pederzini

Helder Pereira

Pietro Randelli

Harald Roos

Roberto Rossi

Dr Claudio Rosso is currently Medical Director of ARTHRO Medics in Basel, Switzerland, specialised in shoulder and elbow surgery. He is Private Docent at the University of Basel and thus involved in teaching and research.

He is also Deputy Chief Medical of the Swiss Karate Federation and served as a MD at the 2016 Rio Olympic Games during the athletics competitions.

He learned shoulder and elbow surgery during his fellowships with Drs Lafosse and Toussait (one year) and Prof. JP Warner as well as Prof. Luke Oh. He is the winner of many national and international research prices (EFORT poster price, DKOU basic research poster price, EFORT fellowship, AGA fellowship, GOTS Asia Fellowship, etc.).

He currently serves in the ESA Board of ESSKA after having served at the ESSKA Elbow Committee for two years (2016-2018).

Dr Patrick Sadoghi finished his tenure track as Associated Professor for orthopedics and orthopedic surgery at the Medical University of Graz in Austria, where he currently works as the Head of the division of knee surgery at the Depatment of Orthopaedics and Trauma.

He was trained at Ludwig-Maximilians University Munich, Germany, the Medical University of Graz, Austria, and attended various clinical fellowships in the United States. He has finished his PhD thesis on platelet-rich plasma in collaboration with the Childrens’ Hospital Boston and his MBA masterthesis on cost-effectiveness in arthroplasty in collaboration with the School of Public Health at Harvard TH Chan.

He is specialised in all aspects of reconstructive knee surgery with a very high clinical and academic background, combining over 350 knee arthroplasty procedures per year with renowned research in the fields of knee implant, joint preservation, and orthopedic sports medicine. He was granted all relevant national and several international awards and is editorial board member of the most renowned journals in his expertise such as the Journal of Arthroplasty, Arthrosopy, and KSSTA.

He lives with his wife Birgit Sadoghi, a dermatologist, and his son Lorenz in Graz, Austria.

Dr Gonzalo Samitier is the current Head of the upper extremity and sports division at the Hospital General de Villalba, Madrid, Spain.

He is on the Editorial Board of the KSSTA journal, the Spanish Orthopaedic Journal, the AAOS Sports Medicine Program Committee, the ISAKOS
Sports Medicine Program Committee and also serves as the director of the Spanish Arthroscopy Training Program (PNFA). He is also on the ESSKA-ESA Committee.

He completed his medical school at Universidad Complutense, Madrid, in 2000, and specialised in orthoparedic surgery from the University Hospital La Princesa in 2005. He won the 2018 ESSKA-APKASS traveling fellowship (Asia-Australia).

Kristian Samuelsson

Romain Seil

Elvire Servien

Prof. Gunter Spahn completed his study in medicine from Jena, Germany, in 1985 and since 2016 has been Assistant Professor for surgery at the Jena University Hospital.

He is an active member of the following societies: ISAKOS (International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine), ESSKA (European Society of Sports Traumatology Knee Surgery and Arthroscopy), AGA (Gesellschaft für Arthroskopie und Gelenkchirurgie), ICRS (International Cartilage Repair Society), DGOU (Deutsche Gesellschaft für Orthopädie und Unfallchirurgie), DGfAM (Deutsche Arthrosegesellschaft).

Anders Stalman

Roland Thomeé

Alberto Ventura

Prof. Piero Volpi received his MD from the University of Perugia in 1979 and successively he completed his residency in  orthopaedic and traumatology  and in sport medicine.

He became Director of  Knee Surgery and Sport Traumatology Unit  at Istituto Clinico Humanitas – IRCCS, Milan, Italy in  2010. He was also a Teaching Professor at  the  Specialty School of Orthopaedics and Traumatology, University of Milan from 2001- 2015.

He has authored more than 300 publications and over 500 contributions, including book chapters, articles and presentations to scientific National and International meetings.

Over the years, his interests have been in  sport traumatology, arthroscopic surgery, knee surgery and cartilage repair.

He was President of SIA (Società Italiana di Artroscopia) from  2015 to 2017 and Secretary EFOST (European Federation of National association of Orthopaedic Sport Traumatology) from 1998 to 2002.

He was a member of the Sports Committe ESSKA (European Society of Sports Traumatology Knee Surgery and Arthroscopy) from 2006 to 2010.

He was President of the Sport Commitee in SIGASCOT (Societa’ Italiana Ginocchio Artroscopia Sport Cartilagine e Tecnologie Ortopediche) from  2004 to 2008, Member Executive Committe 2008-2010 and  President of Scientific Committe from 2010 to 2012.

He is a former professional football player (1972-1985).

He is currently the Head of Medical Staff  FC Internazionale Milan from 2014 after his previous appointment from 1995 to 2000.

He was Responsible Physician of  Italian Association Football Players ( AIC ) from 2000 to present and Member UEFA Medical Committee from 2015 to 2017.

Prof. Lieven De Wilde studied medicine at the Universiteit van Gent. From June 1983 to June 1985-86, he worked with doctors without frontiers in Tjsaad and in 1986-87 in Thailand with the same organisation.

He then started training as an orthopedic surgeon and traumatologist at UZ Gent. He started with the shoulder and elbow surgery unit at the department of orthopedics and traumatology at the University Hospital Gent in 1992.

He obtained his PhD doctorate in 2004 and was appointed clinical professor in shoulder and elbow surgery in 2008. In 2014, he became his full professorship.

He has published more than 65 articles and more than 12 chapters in various orthopedic books. He presented more than 400 oral papers at international shoulder conferences whole over the world.

He also has 14 patents on shoulder inventions in both Europe and the US. In addition to organisng various conferences, he is an active member of the BVOT (Belgian Association for Orthopedics and Traumatology), BELSS (Belgian Elbow and Shoulder Society), ESSKA (European Society of Knee Surgery Sports Traumatology Arthroscopy, SECEC / ESSE (European Society of Shoulder and Elbow Surgery) and the ASES (American Shoulder and Elbow Society).

He is reviewer for 15 peer-reviewed international orthopedic journals and is associate editor of three  journals. He is consultant for three orthopaedic companies and receives royalties for the Delta Xtend (DePuy-Synthes) reverse shoulder prosthesis. His main area of  interest is the shoulder (prosthetic) surgery and functional anatomy of the shoulder.

Prof. Kazunori Yasuda completed his Orthopaedic Residency at Hokkaido University Hospital, Sapporo, in 1980. He became a Professor and Chairman of Sports Medicine and Knee Joint Surgery, Hokkaido University School of Medicine, in 1997. He served as Dean of Hokkaido University School of Medicine from 2009 to 2011, and as an Executive and Vice-President of Hokkaido University from 2013 to 2017.

Since 2017, he has been a Professor Emeritus, Hokkaido University. Currently, he performs many knee surgeries at the Sports Medicine and Arthroscopy Center in Yagi Orthopaedic Hospital as a Director, and continues his research activities in Hokkaido Universityas an an Invited Professor.

Prof. Yasuda is best known for his contribution to the progression of anatomic double-bundle ACL reconstruction using the hamstring tendon. Two of his clinical articles on “anatomic double-bundle ACL reconstruction” were selected as the top 1% of highly-cited articles in the entire scientific field. He is a skillful knee surgeon as well as a distinguished scientist in the field of biomechanics and biomaterials. He has published over 250 journal articles, which have been cited over 5,000 times.

Prof. Yasuda has been an active member of ISAKOS and ESSKA. He contributed to ISAKOS as a Member at Large from 2005 to 2009, a Deputy Chair of Program Committee from 2005 to 2007, and a Chair of Program Committee from 2005 to 2007. He has contributed to many Japanese societies taking on the role of the president.

Eva Zeisig