Measurement of pelvis
①Interspinal diameter: normal value is 23~26cm 髂棘间径
supine position
anterior superior iliac spine
②Intercristal diameter: normal value is 25~28cm 髂嵴间径
supine position
crista iliaca
③External conjugate: normal value is 18~20cm 骶耻外径
The patients should lie left position, bent the left leg and straighten the right leg.
The fifth lumbar spinous process
The superior border of pubic symphysis
④Intertuberal diameter: average 9cm 坐骨结节间径
The patients should lie supine position, bent two legs and keep th e position of knee to chest.
ischial tuberosity
⑤angle of pubic arch 耻骨弓角度
Position: same to ④
The desecnding branch of pubic
The normal value is 90°＜80°is abnormal
