LONG-TERM OUTCOME OF ROTATIONAL ACETABULAR OSTEOTOMY - 145 HIPS FOLLOWED FOR 10-23 YEARS

We report the long-term outcome of rotational acetabular osteotomy in 145 dysplastic hips of 131 patients after an average follow-up of 13 ( 10-23) years. The mean age at operation was 28 (11-52) years. The radi ographic severity of osteoarthrosis before operation, according to the criteria of the Japanese Orthopaedic Association, was stage I (no deg enerative change) in 63 hips, stage II (early degenerative stage) in 4 9, stage III (progressive stage) in 21 and stage IV (end stage) in 12. The clinical outcome based on the Merle d'Aubigne and Postel score wa s excellent or good for 90 (80%) of the 112 hips which had stage I or II osteoarthrosis preoperatively, and was excellent or good for only 9 of the 33 hips which had stage III or IV osteoarthrosis (p<0.001, chi -square test). The radiographic severity of osteoarthrosis at the most recent review was stage I or II for 79 (70%) of the 112 hips which ha d stage I or II osteoarthrosis preoperatively. The long-term outcome o f rotational acetabular osteotomy was satisfactory for a dysplastic hi p with little, if any, osteoarthrosis, but was unsatisfactory for a hi p with more advanced osteoarthrosis.