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We experienced four cases of extensor tendon rupture following primary osteoarthritis of the distal radio-ulnar joint (DRUJ). They included three males and a female, whose ages ranged from 56 to 80 years (average 69 years).In all the cases, roentogenograms showed osteoarthrotic changes of the DRUJ and dorsal subluxation or dislocation of the ulnar heads.Tendon transfers were done in three cases, in addition to Darrach's operation in one case and a Sauve-Kapandji operation in another case. Friction at the ulnar head and its osteophytes caused the extensor tendons to rupture.

We performed hip arthroplasty using bipolar endoprosthesis combimed with bone grafting acetabuloplasty on 77 cases in our department from 1982 to 1990. We examined two problems of rehabilitation in these cases. The most important problem was the degree of body weight bearing on the hip joint and the length of time after the operation. Another problem was the circumstances of the patients' daily-life at their houses, such as stairs, Japanese style toilet and bath.

In the past, as a posterior decompression surgery for OPLL, Iaminectomy was perfomed. Howerver, postoperative follow-up was made difficult by such negative factors as instability of the operated part, abnormal alignment, scar formation, etc. Therefore, to counteract these negative results, a variety of Iaminoplasty are being tried in recent years. We have performed Iaminoplasty both by the Kirita and Hirabayashi methods at our hospital since 1983, and we hereby report our evaluation of the operative results and the postoperative complications.With the Hirabayashi method, we observed the limitation of the range of movement in the posterior flexion. We could observe no difference in the improvement rate of the clinical condition when using different operative techniques. Postoperatively, we had no case where OPLL's growth could be clearly observed.In case of the unilateral existence of ossifications with a high rate of stenosis, we thought it was necessary to practice sufficient caution at the time of operation in order to prevent complications.

Allograft was used on a patient who was diagnosed as rheumatoid arthritis with severe acetabular protrusion. The acetabular deficiency was reconstructed with the allograft in bipolar hip arthroplasty. We employed a freezed femoral head as the allograft.Roentgenographically, bone trabeculae were passing the graft-acetabular junction in medio-inferior region.Bone scans showed increased activity in the allograft near the host-donor junction at an early stage and maintain high activity up to date.Partial incorporation and high radioactivity suggest that this allograft will be incorporated completely at the early date.