Base of the neck extracapsular osteotomy for correction of deformity in slipped capital femoral epiphysis.

This is a report on a University of Illinois Hospital series of cases of extracapsular base of the neck osteotomy for slipped capital femoral epiphyses. The osteotomy was performed on 20 hips in 16 patients, with a 71/2 year average follow-up. The results of this procedure are encouraging and illustrate the advantages of technical simplicity and minimal risk of avascular necrosis. The method does not create any additional deformity. The only disadvantage is that the correction could be limited. The maximum correction of posterior tilt was 55 degrees and the maximum correction of varus deformity was 50 degrees.