Purpose To evaluate the efficacy and safety of lateral shelf acetabuloplasty in Legg-Calvé-Perthes (LCP) hips classically associated with poor prognosis. Methods A retrospective study was conducted on 30 consecutive pediatric patients (average age 8.6 years) presenting with a severe and progressive form of LCP disease, with (16 hips) or without (14 hips) femoral varus osteotomy (FVO), and treated by lateral shelf acetabuloplasty. Shelf was done on hips presenting an aspherical incongruency with flattening, subluxation, and lack of femoral head coverage, as demonstrated on pre-operative radiographs and arthrography. All patients were reexamined at an average follow-up of 9.5 years (range 5.2-12 years). Clinical, radiological, and computed tomography scan evaluations were undertaken. Stulberg and Mose classifications were applied as radiological indicators of prognosis. Statistical analysis was performed using Student's t test and the Pearson correlation test with variance analysis for repetitive measures.
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