Abstract
Follow-up studies were carried out to ascetain changes of grafted bone and the appearance of radiolucent zones at the acetablum on X-rays of 177 hips in 148 cases after cemented total hip replacement. The length of the follow-up studies was from 3 to 6 years. Bone graft was performed on the dysplastic acetabulum 97 to cover the entire area surrounding the socket. The patient's own femoral head, with osteoarthritis removed during the operation, was used for the graft bones. The grafted bone was alive on the weightbearing zone in almost all of the cases.
Two to five years after the surgery, absorption of grafted bone was seen in 30 hips (16%) and had stopped in 29 hips (97%) . Radiolucent zones were found in 11 hips (6.2%) . The appearance rate of radiolucent zones was significantly reduced by bone grafting, especially at Zone 1 and Zone 2. No radiolucent zone was observed at Zone 1 and Zone 2 in 147 hips in which no grafted bone was absorbed. Some causes of absorption of grafted bone were believed to be severe bony atrophy and multinodular cysts in the grafted femoral head at the time of surgery. As a result, the survival rate of grafted bone was excellent.
