Department of Surgery, Section of Orthopedic Surgery, University of Chicago Hospitals and Clinics, Pritzker School of Medicine, Chicago, Illinois.
Reprint requests to: Michael A. Simon, M.D., University of Chicago, Department of Surgery, Section of Orthopedics, 950 East 59th Street, Chicago, 111. 60637.
Supported in part by the Cancer Research Foundation, Chicago, Illinois.
Received: May 4, 1981.