[Failure of unicompartmental tibiofemoral prosthesis in treatment of arthrosis: clinical study of 34 cases].

We studied retrospectively and prospectively 34 cases of failed knee arthroplasty. The failure was mostly due to contralateral progressive arthrosis in the tibiofemoral joint (15 cases, 44.1%). Instabilization of the knee joint and abnormal ranked prosthesis second (9 cases, 26.5%), and loosening third (7 cases, 20.6%). Infections were noted only in 3 cases (8.8%). This prosthesis demands meticulous surgical techniques and strict indications because of its geometric characteristics and stabilization. Contralateral progressive arthrosis and abnormal prosthesis accounted for 70.0% in all, and were resulted from poor surgical technique and improper indications.