Mr Dermott Collopy is a Perth-based surgeon specialising in hip and knee replacement, revision arthroplasty, and pelvic and acetabular trauma. He completed his advanced surgical training at Royal Perth Hospital. After gaining FRACS Ortho in 1994, he undertook three years of overseas fellowship training in the area of hip and knee arthroplasty and revision surgery, initially at the Nuffield Orthopaedic Centre, Oxford UK, followed by the Cleveland Clinic, Ohio, and finally a fellowship in pelvic and acetabular trauma at Parkland Memorial Trauma Centre, Dallas Texas.   Mr Collopy is the immediate Past-President of the Arthroplasty Society of Australia, and past Chairman of the WA State branch of the AOA, and AOA Branch Director for WA, the Continuing Orthopaedic Education Committee, and the National Joint Replacement Registry Committee. His research interests are in hip and knee implant design and fixation, and was one of the design surgeons on the Emperion revision hip system, the Triathlon knee system and the AccoladeII hip system. He, together with one of his partners, Mr Gavin Clark, is involved in developing robotics in knee and hip replacement.