From the Granovsky Gluskin Division of Orthopaedics, Mount Sinai Hospital, Toronto, Ont. (Wolfstadt); the Division of Orthopaedic Surgery, Department of Surgery, University of Toronto, Toronto, Ont. (Wolfstadt, Pincus, Kreder, Wasserstein); the Division of Orthopaedic Surgery, Sunnybrook Health Sciences Centre, Toronto, Ont. (Pincus, Kreder, Wasserstein); the Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ont. (Pincus, Kreder); and ICES, Toronto, Ont. (Pincus, Kreder).