Abstract
Aims: To review the medium term clinical and X-Ray results of DDH in SA, using the Conserve Plusª. Methods: 28 hips (26 patients, avg. age 43.2 years) with DDH were treated with hybrid MMSA. 81% were female. 42% had prior osteotomies. 25% had acetabular cysts that were grafted and 64% had femoral cysts (> 1cm in size) & 1 was grafted. A posterior approach was used in all but one case. Results: Mean F/U was 4.1 years (3.3– 6.5). UCLA hip scores were 3.3, 6.0, 5.7 and 4.5 pre-op and 9.2, 9.3, 9.3 and 7.1 at last F/U for pain, walking, function and activity. SF-12 scores normalized. Range of motion was 121.3û, 73.7û and 83.7û at last F/U for Flexion, abductionadduction, and rotation arcs. 2 hips were converted to THA: 1 for femoral neck fracture at 2 months (neck osteopenia and cystic degeneration) and 1 for recurrent subluxations due to poor offset and impingement due to prior multiple osteotomies. 4 technical complications successfully resolved: 1 trochanteric non-union, 1 post-op dislocation (closed reduction), 1 component mismatch (acetabular component exchange) and 1 femoral nerve palsy. X-ray analysis: 2 pts. presented complete radiolucencies around the metaphyseal stem and 1 patient was symptomatic and will require revision). Conclusions: SA is stable, except for 1 subluxation due to impingement with poor off-set compared to 7–10% with THA. The socket þxation is secure with grafts incorporating whereas prior SA with PE were poor due primarily to socket loosening. Femoral bone preparation is critical to avoid fractures and loosening.
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.
