Innominate osteotomy for Legg-Calvé-Perthes disease. A, Seven-year-old child with bilateral Catterall group III involvement with “head-at-risk” signs of lateral calcification (subluxation) and metaphyseal cyst on right. B, Eight weeks after innominate osteotomy with fixation using three pins. C, Three years after innominate osteotomy. Femoral head is contained without evidence of subluxation. Center-edge angle is 28 degrees, and femoral head is concentric but slightly enlarged.