[Treatment of recurrent luxation of total hip prosthesis by posterior methyl methacrylate buttress].

A shelf operation using cement held by screws inserted into the posterior wall of the acetabulum is described in cases of recurrent dislocation of hip prostheses. The procedure was used in 7 cases of total prostheses and 2 of femoral prostheses. The technique is simple and reliable. It should be used when there is no obvious malposition of the prosthesis or in the elderly when a further operation to re-orientate a faulty prosthesis would be too risky. The results were satisfactory with 7 successes in 9 patients.