From the Orthopaedic Department, University of Edinburgh, Edinburgh, Scotland.
A. M. Davison and D. A. D. Macleod were supported by Gunning Medical Vacation Bursaries during part of the study. Financial support was generously given by the Laming Evans Research Fund, Sandoz Products Limited, and from the research fund of the Edinburgh Royal Infirmary.
* Consultant Orthopaedic Surgeon.
† Research Assistant.
‡ Senior House Officer.
§ Lecturer, Department of Statistics.