*Department of Orthopaedic Surgery, Asaf Harofeh Hospital, Zerifin.
**Department of Neurology, Beilinson Medical Center, Petach Tiqva and Tel Aviv University Sackler School of Medicine, Israel.
† Department of Pathology, Asaf Harofe Hospital, Zrifin.
Reprint requests to Nachum Halperin, M.D., Department of Orthopaedics, Asaf Harofe Hospital, Zerifin, Israel.
Received: March 28, 1980.