1. Orthopaedic Surgeon, St. Joseph's Hospital, and Lecturer in Surgery, University of Toronto, Toronto, Ontario, Canada. To whom requests for reprints should be addressed, at Division of Orthopaedic Surgery, St. Joseph's Hospital, 30 The Queensway, Toronto, Ontario, Canada.
2. Research Fellow, Division of Orthopaedic Surgery, St. Joseph's Hospital, Toronto, Ontario, Canada.