Department of Orthopaedic Surgery, Kyushu University, Faculty of Medicine, 3–1-1, Maedashi, Higashi-ku, Fukuoka, JAPAN.

^*Presented at the 13th World Congress of Rheumatology in Kyoto, Japan, 1973, and presented as a Scientific Exhibit at the 43rd Annual Meeting American Academy of Orthopaedic Surgeons in New Orleans, 1976.