Femoral derotation osteotomy in cerebral palsy: precise determination by tables.

Femoral derotation osteotomy is used to treat increased femoral neck anteversion and to correct medial hip rotation deformity in patients with cerebral palsy. We investigated if there were significant differences between planned and achieved corrections of increased femoral neck anteversion and whether our method influenced walking ability and number of complaints. We retrospectively evaluated 17 ambulatory patients (21 femurs) with cerebral palsy and medial rotation deformity of the hip. The new method of determining femoral derotation osteotomy precisely and simply using tables was applied. The average followup was 11 years (range, 3-20 years), and the average age of the patients was 20 years (range, 9-42 years). The average planned correction of femoral neck anteversion was 31.9 degrees (range, 20 degrees - 45 degrees), and the average achieved correction was 32.19 degrees (range, 15 degrees - 40 degrees). Of the 17 patients evaluated, 13 no longer had complaints. Deterioration of walking ability was not observed in any patients. The new method of determining femoral derotation osteotomy precisely and simply corrects femoral neck ante- version in patients with cerebral palsy and medial rotation deformity of the hip, leading to reduction in complaints and improved walking ability.