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O2371 FATE OF CEMENTLESS ACETABULAR COMPONENTS RETAINED DURING REVISION OF A FEMORAL COMPONENT OF A TOTAL HIP ARTHROPLASTY



Abstract

Aims: The purpose of this study was to determine the success of retaining a well-þxed acetabular component at the time of isolated femoral revision and identify variables that may inßuence clinical decision making and outcome. Methods: 83 consecutive patients (90 hips) with a retained cementless socket during revision of a femoral component were reviewed. Eighty-þve percent of the hips were initially reconstructed as metal on polyethylene surface arthroplasty (SA) and 15% as a standard stem type total hip replacement (THR). Average age at the time of revision was 54. 33% of the patients had acetabular osteolysis of which 52% were grafted. Results: Mean follow up 9.6 years (5.5 to 15.9). Average time in situ of socket 14.8 years (7.1 to 20.2). 5 sockets were revised at a mean of 6.8 (2.5–10.4) years post revision and 13.1 years in situ. Reasons for socket revision were: 1 socket loosening, 1 dissociation of the liner cemented into the original socket, 1 instability, 1 conversion to a Metal/Metal bearing and 1 because it was the surgeonñs preference to remove the well-þxed socket. Dislocation rate was 15% with 50% occurring in the þrst 6 months post revision. Nine had more than one episode of dislocation. No recurrence or expansion of pelvic osteolysis was observed at last follow-up. Discussion: Revision of a cementless socket on the basis of the duration in vivo and/or presence of osteolysis does not appear to be warranted. Because of the high risk of dislocation off set liners/stems and larger femoral head sizes should be considered, especially in revision of SA.

Theses abstracts were prepared by Professor Dr. Frantz Langlais. Correspondence should be addressed to him at EFORT Central Office, Freihofstrasse 22, CH-8700 Küsnacht, Switzerland.