Abstract
The authors report on 85 adduction-derotation osteotomies and 13 operations on the acetabulum performed in 56 children with cerebral palsy. Such causes as were observed of an increased tendency toward reabduction are described, taking age at operation into consideration. Other postoperative complications, including fragment dislocations and fractures of the shaft of the femur following disuse osteoporosis, are pointed out. The problem of the änti-Chiari effect", resulting from the negative function of the hypsiloid cartilage, is discussed with regard to the formation of the "Chiari roof".
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