3Brunner A, Jockel JA, Babst R. The PFNA proximal femur nail in treatment of unstable proximal femur fractures - 3 cases of postoperative perforation of the helical blade into the hip joint[J]. J Orthop Trauma,2008,22(10) : 731 -736.
2Takigami I, Ohnishi K, Ito Y, et al. Acetabutar perforation after medial migration of the helical blade through the femo- ral head after treatment of an unstable trochanteric fracture with proximal femoral nail antirotation (PFNA) :a case re- port [ J ]. J Orthop Trauma,2011,25 (9) : e86 - e89.
3Nilsdotter A, Bremander A. Measures of hip function and symptoms:Harris Hip Score(HHS), Hip Disability and Os- teoarthritis Outcome Score (HOOS), Oxford Hip Score (OHS) ,Lequesne Index of Severity for Osteoarthritis of the Hip( LISOH), and American Academy of Orthopedic Sur- geons (AAOS) Hip and Knee Questionnaire [ J ]. Arthritis Care Res(Hoboken) ,2011,63 ( Suppl 11 ) :200 - 207.