Shelf acetabuloplasty for containment in the early stages of Legg-Calve-Perthes disease.

BACKGROUND

To evaluate the effectiveness of shelf acetabuloplasty in the containment of extruded hips without hinge abduction in early stages of Legg-Calve-Perthes disease, we present a retrospective series of 44 patients (45 hips) treated between August 1999 and February 2010, which included 34 boys and 10 girls with a mean age at diagnosis of 7.4 years (range, 3.9 to 15.3).

METHODS

All patients presented with sclerosis or early fragmentation stages. The average time from diagnosis to surgery was 2.1 months (range, 0 to 8.2) and the mean time to heal was 40.4 months (range, 20 to 82.2). The Reimer migration and the deformity indices were measured on initial, preoperative, postoperative, and healed x-rays. The average deformity index at 3 of those 4 timepoints was significantly related to their final Stulberg classification. CE angles increased and Sharp angles decreased significantly as a result of treatment.

RESULTS

At the healed stage and consistent with other published series, 84.4% of patients were Stulberg III or less, denying any pain, and with full range of movement, whereas 15.6% were classified as Stulberg IV.

CONCLUSIONS

We defend that shelf acetabuloplasty should be performed early in the disease and, uniquely, we propose that the indication for treatment should be guided by the deformity and the Reimer migration indices.

LEVEL OF EVIDENCE: IV.