We reviewed bilateral total hip replacements (by JIAT) performed for treating bilateral coxarthrosis. During the ten year 16 patients were operated on by JIAT. Subjects included two males and 14 females whose ages at the time of operation ranged from 44 to 75 years (mean 62.7 years). Follow up of the joint operated on was 6.6 years on average, and 4.6 years for the second joint.
Patients were chinically evaluated according to the Japanese Orhtopaedic Association's (JOA) hip score, and radiologecilly using spike angle and stem sinking. In addition, we investigated the relationship between stem sinking and leg length discrepancy. Total JOA hip score of the first operated side improved from 42.6 preoperatively 82.8 at follow-up. Also, the total score of the second side improved from 38.5 preoperatively to 84.0 at follow-up. Clinically, the postoperative course was good.
There were no significant differences in spike angle between the first operated side and the second side. But, in regard to stem sinking on the first operated side, there was a larger amount of sinking in the period prior to the second side operation (leg length descrepancy=19mm) compared with the other period (leg length discrepancy=0mm).
