
- European Society of Biomechanics ESB
- International Society of Fracture Repair ISFR (Founding member)
- Swiss Foot and Ankle Society SFAS
- Swiss Society of Orthopaedic Surgery SGO-SSO
- Founding Member of ESFAS (European Society of Foot and Ankle Surgeons), 1993. President of ESFAS 1994-95
- Corresponding Member of the American Orthopaedic Foot and Ankle Surgeons AOFAS, Seattle, USA
- Editorial board member, Foot and Ankle Surgery, Blackwell Science Ltd., London, Boston, Edinburgh, Melbourne, Oxford, Paris, Vienna, Tokyo
- Member of the “Groupe d’Etude du Pied” GEP of the SO.F.C.O.T, Société française de Chirurgie Orthopédique et de Traumatologie
- Corresponding member (membre étranger) of the SO.F.C.O.T, Société française de Chirurgie Orthopédique et de Traumatologie
- Corresponding Member of the Orthopaedic Trauma Association OTA, Rosemont, USA
- Editorial board member, Revue de Médecine et Chirurgie du Pied, Masson Editeurs, France
- Member of the swiss section of AO (Arbeitsgemeinschaft für Osteosynthesefragen)
- Member of the “Foot and Ankle Expert group” of the AO Technical Commission (1993 – 2006)(AOFAEG) (chairman: Prof. H. Zwipp)
- Member of the swiss orthopaedic board examination committee
- Member of the Swissorthopaedics research grants and traveling fellowship program committee.