4Mckay DW.A comparison of the innominate and pericapsular osteotomy in treatment of congenital dislocation of the hip[J].Clin Orthop Relat Res,1974,98:124-132.
5Ward WT,Vogt M,Grudzlak JS,et al.Severin classification system for evaluation of the results of operative treatment of congenital dislo-cation of the hip[J].J Bone Joint Surg,1997,79(5):656-663.