ABSTRACT
Arched rotational osteotomy of the innominate bone is adopted to the treatment of congenital dislocation of the hips. The key of technique is osteotomy in an arched line from the anteroinferior iliac spine to the greater sciatic noch, and then turn the distal segment downward and outward for 30. This operation can effectively adjust the acetabular index and direction to keep the femoral head stable in position after reduction. Since 1986, 17 cases (23 hips) have been operated. 15 cases (20 hips) of them were foliwed up for more than 1 year, and satisfactory result was found. The advantages of the op-eration were:as the distal segment is turned downward and outward, there was less downward displacement of the upper rim of the acetabulum, or that no pressure would be exerted on the femoral head. The acetabular direction is accurately adjusted to well restore the weight-bearing relationship between the head and acetabulum. The operation was less complicated, less traumatic, and bone grafting was not necessary. The line of osteotomy healed repidly and early exercises were facilitated.