Abstract
We reviewed the results of bipolar hemiarthroplasty performed in 57 hip joints in 50 patients. The mean follow-up period was 127 months (range, 60 to 218 months) . The original disease was femoral neck fracture in 15 joints, avascular necrosis (ANF) of the femoral head in 19 joints, and osteoarthritis in 23 joints, which included 5 joints of stage IV in ANF. Revision surgery had to be performed in 13 joints (22.8%) . Proximal migration of the prosthesis over 3mm was radiologically diagnosed in only 1 (6.7%) of the femoral neck fracture hips, and 2 (10.5%) of the ANF hips. In the 23 (OA) joints that needed acetabular reaming during the first surgery, proximal migration was seen in 20 joints (87%) . The results of the present study suggest that bipolar hemiarthroplasty can be successful in patients who have normal acetabula, as in early ANF, and should not be used for degenerative and displastic acetabula that need reaming and bone grafting. For stage III in ANF, we had good results radiologically but some patients complained of inguinal pain.
