This study was done and submitted to The Kappa Delta Sorority and the Orthopaedic Research and Education Foundation of the American Academy of Orthopaedic Surgeons. It was awarded the Kappa Delta Award in 1976. Kappa Delta awards honor innovative orthopaedic research . The Kappa Delta Sorority and the Orthopaedic Research and Education Foundation (OREF) presents awards to scientists conducting outstanding research related directly to musculoskeletal disease or injury with the goal of advancing patient treatment and care.