Innominate osteotomy using quadrangular graft (see text) for Legg-Calvé-Perthes disease. (From Canale ST, D’Anca AF, Cotler JM, et al: Innominate osteotomy in Legg-Calvé-Perthes disease, J Bone Joint Surg 54A:25–40, 1972.) SEE TECHNIQUE 32.1.