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"Hinge abduction" is a complication of Perthes' disease caused by impingement of the extruded superolateral portion of the femoral head against the lateral lip of the acetabulum. Catterall first described femoral valgus extension osteotomy (VGEO) to treat this condition. We report the results of this operation in 16 cases of Perthes' disease with "hinge abduction".

Valgus extension femoral osteotomy to treat “hinge abduction” in Perthes’ disease