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中骨盆横径（坐骨棘间径）是骨盆腔最窄平面最小径，目前尚无准确的测量和计算方法．我们经历7年多临床摸索，总结出坐骨林间径简易计算公式：坐骨棘间径=2．9cm十坐骨结节间径（cm）-坐骨棘内突程度（cm）。经85例X片与临床对比例量和统计学分析，证明该公式能较准确地推算坐骨棘间径．帮助医师估计中骨盆平面头盆关系，减少中骨盆平面头益不称所致胎头受压，减少产妇痛苦，新生儿并发症，提高人类素质起到积极的作用．
In the pelvic diameter (ischial spine diameter) is the narrowest pelvic minimum diameter, there is no accurate measurement and calculation methods. We experienced more than 7 years of clinical exploration, summed up the simple formula for calculating the diameter of the sciatic forest: sciatic spine diameter = 2.9cm ten sciatic nodules (cm) - sciatic spine degree (cm). The 85 cases of X-ray and clinical comparative quantitative and statistical analysis showed that the formula can more accurately calculate the ischial spine diameter. Help physicians to assess the relationship between the pelvis in the basin, reducing the head and neck in the pelvis caused by head pressure, reduce the pain of maternal, neonatal complications, improve human quality play a positive role.