1Kim HJ,Kim YM,Lee DY.Result of mrltiple drilling for the eanlg stoge nontraumatic osteonecrosis of the femoral head.J of Korean Orthop[].Assoc.1997
2Bozsan EJ.A new treatment of intracapsular fracture of the neck of femur and Calve—Legg—Perthes disease[].Journal of Bone and Joint Surgery British Volume.1982
