From the Division of Orthopedic Surgery, Stanford University Medical Center, Stanford, California. Presented in part at the Western Orthopedic Association Meeting, Colorado Springs, Colorado, 1977; the SAMA-UTMB Research Forum, Galveston, Texas, 1977; Societe Internationale De Chirurgie, Orthopedique Et De Traumatologie, XIV World Congress, Kyoto, Japan, 1978.