[Hooked roof cup in revision of difficult loose hip prosthesis cups. Results after a minimum of 10 years].

The long-term results of acetabular revision after total hip arthroplasty (THA) with the use of a reinforcement ring with hook were evaluated. The study included 57 cases of surgery dating back 10 years or more. Of a total of 54 patients (57 operated hips), 18 patients (19 hips) died during the 10-year period and 2 patients (2 hips) were completely lost to follow-up. At the time of the revision surgery, the mean age of the remaining 34 patients (36 hips) was 62.5 years (range: 47-80). A THA revision was done in 25 cases and an acetabular revision only in 11 cases. The most common acetabular defect was a combined segmental and cavitary defect (n = 19), and in three cases there was pelvic discontinuity. Autologous or homologous cancellous bone grafts were used to fill acetabular cavities in 17 hip joints. Structured bone grafts, predominantly homologous bone, were used in ten cases for acetabular reconstruction. At a mean follow-up of 11.4 years (range: 10-14.5) three hip joints (8%) had undergone further revision. The revisions were done for aseptic loosening of the acetabular component in two cases and a septic loosening of both components in one case. Three further cases (8%) revealed signs of acetabular loosening. Two of these three patients were symptomatic but refused further revision surgery. In the 33 unrevised hip joints, a good or excellent clinical result with a d'Aubingé score of more than 14 points was found in 30 cases (92%). Osseous acetabular reconstruction with the use of a reinforcement ring leads to favorable results compared to other techniques. In the authors' opinion, this technique is preferable to those using oversized cups without osseous reconstruction of the acetabulum.