Native of Lyon France and pure product of the Lyonnaise Orthopedic school, Doctor Gilles Walch focused on shoulder disorders very early in his career.After numerous publications on patello-femoral instability and natural history of cruciate ligament rupture, he travelled to the United States to visit Dr Franck Jobe and Dr Ch Rockwood. Since his return to France Dr Walch has focused completely on the shoulder, improving the understanding and treatment of various shoulder disorders. Dr Walch is one of the designers of the Aequalis Shoulder prostheses family. He has been a pioneer in the understanding of shoulder conditions and has developed several concept including internal impingement, arthroscopic tenotomy of the biceps in massive RCT, hidden lesion of the Subscapularis, the Latarjet procedure, the classification of arthritic glenoid, the role of the Teres Minor in MRCT and the musculo-tendinous rupture of the Infraspinatus For the last 20 years he has concentrated exclusively on surgery and arthroscopy of the shoulder with shoulder instability, rupture of the rotator cuff and shoulder arthroplasty forming the basis of his day to day work.