随着老龄化社会的降临,转子间骨折的发生率在逐步升高,由于这类骨折的特殊性,使得其治疗成为一个难点,临床上时有转子间骨折内固定失败的病例报道。手术技巧1:用好尖顶距(tip to apexdistance,TAD),TAD由Baumgaertner等人首先提出,用以测量螺钉距离股骨头的深度和确定螺钉的中心位置(图1)。目前TAD已经成为转子间骨折内固定失败的有效预测因素。理论上认为,螺钉深度和中心位置距离股骨顶点均在10mm以内是最为恰当的(图2),两者相加TAD<25mm被认为具有较高的内固定成功率,但有些创伤科医生认为TAD<20mm更为恰当。图1:TAD计算方法XapTAD()(mDtrueFig.1Technique for calculating the tip-to-apex distance (TAD).For clarity,aperipherally placed screw is depicted in the anteroposterior(ap)viewand a shallowly placed screw is depicted in the lateral (lat)view.Due=known diameter of the lag screw.(Reprinted from:Baumgaertner MR,Curtin SL,Lindskog DM,Keggi JM.The value of the tip-apex distance inpredicting failure of fixation of peritrochanteric fractures of the hip.了香园JBone Joint Surg Am.1995:77:1059.)wWw.BAT.CK