结论在骨盆正常情况下，新生儿过大、胎方位异常及产力异常是造成第二产程异常的主要原因。

Conclusions When the pelvis was normal, fetal macrosomia, abnormal fetal position and abnormal uterine were main causes leading to abnormal second stage of labor.

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目的：测量骨盆倾斜度外测量正常值，为产前检查估计难产风险指数提供依据。

Objective: to survey the normal values of pelvic inclination of external pelvimetry and to provide evidence so as to estimate dystocia risk index for antenatal care.

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