[Studies of shelf operation on congenital dislocation of hip (author's transl)].

Part I The author examined 62 hips in 58 patients treated by shelf operations, and their long-term results were studied as a follow-up for an average of 10 years. Satisfactory results of the shelf operation were obtained in 51.7% of patients, if over 10 years of age when operated on, but in as many as 72.0%, if under 6 years of age. But as the age of each group changed from that of the time of follow-up age it was impossible to carry out any comparable study between the two groups. Better roentgenographical results appear to be obtained, if this procedure is performed on those over 10 years of age. Part II In an attempt to detect the changes of a hip after the destruction of the outer rim of the acetabulum, experimental studies were undertaken on 50 young rabbits about 40 days after birth. In order to destroy the outer rim of the acetabulum, a small piece of autogeneous iliac bone was embedded in the outer rim of acetabulum where the bone graft is done in human's acetabuloplasty. The results showed that this procedure had no influence on the development of osteoarthritis in a rabbit.