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报告了一种新的评价先天性髋脱位（ＣＤＨ）的Ｘ线片指标一ｃ／ｂ比率。具体测量方法：摄标准的骨盆ｘ线乎片，中心线垂直通过骶骨和耻骨联合中心。ｃ表示从股骨近端干髀端最内点至中心线的距离，ｂ表示从骨髋外缘（即Ｐｅｒｋｉｎ线）至中心线的距离。ｃ／ｂ比率表示股骨头向?
A new c-b ratio was reported for radiographic evaluation of congenital dislocation of the hip (CDH). Specific measurement methods: the standard pelvic x-ray film, the center line perpendicular through the sacrum and pubic symphysis center. c represents the distance from the innermost point of the proximal femur stem to the centerline, and b represents the distance from the outer edge of the hip bone (ie Perkin line) to the centerline. c / b ratio that the head of the femur?