Abstract：Objective To inquire the technique of Ferguson's operation and the causes of failure in operation. Methods Ferguson's operation was performed on 28 hip joint of 20 cases(male 3, female 17) with congenital dislocation of the hip. The average age of the patients was 18.2 months (ranging from 10 to 32 months). Results Postoperatively, the hip safe zones of 26 hips were 60 ～90, and 2 hips were 30 . The average duration of follow-up was four years and nine months (ranging from nine months to six years and seven nomths). The hip activties of the all patients exceeded 130 degree. Reduction of 26 hips succeeded. Two hips presented subluxation. Five hips presented vascular necrosis of the femoral head; tow hips bring into sight gluteus contracture. Conclusions The major cause of failure was due to the infants' age older and the femoral anteversion angles are larger. The roentgenogram must take in preoperation to measure the femoral anteversion angles. It is proposed that the infants over the age of 30 months and the femoral anteversion angles more than 70 and the closed redution without any feeling should have anterior open reduction instead of an attempt a Ferguson's operation.
