Björklund K, Lindgren P G, Bergström S, Ulmsten U
Department of Obstetrics and Gynecology, Akademiska Hospital, Uppsala University, Sweden.
Acta Obstet Gynecol Scand. 1997 Mar;76(3):227-32.
To elucidate whether there is a distention of the symphysis pubis intra partum and whether a history of pelvic pain during pregnancy is associated with increased distention during delivery.
Using ultrasonography, the width of the symphysis pubis was measured on two occasions during delivery; firstly, upon engagement of the fetal head in the pelvic inlet, secondly, when the largest diameter of the fetal head was at the level of the ischiadic spines. The first measurement was conducted in 24 patients, the second measurement was obtained in 16 of these patients.
The average width of the symphysis pubis at onset of labor was 5.8 mm. The average distention of the symphysis during labor was 1.1 mm for those without pelvic pain and 0.2 mm for those with a history of pelvic pain during pregnancy (p = 0.02). Parity and ensuing birth weight had no statistically significant influence on degree of distention.
The symphyseal distention during labor is minimal regardless of parity and size of the child. No added symphyseal distensibility was found in patients with a history of pelvic pain.
阐明分娩时耻骨联合是否会扩张，以及孕期盆腔疼痛史是否与分娩时扩张增加有关。
采用超声检查，在分娩期间两次测量耻骨联合的宽度；首先，在胎头入盆时测量，其次，当胎头最大径线位于坐骨棘水平时测量。第一次测量了24例患者，其中16例患者进行了第二次测量。
临产时耻骨联合的平均宽度为5.8毫米。无盆腔疼痛者分娩期间耻骨联合的平均扩张为1.1毫米，有孕期盆腔疼痛史者为0.2毫米（p = 0.02）。产次和出生体重对扩张程度无统计学上的显著影响。
无论产次和胎儿大小如何，分娩时耻骨联合的扩张都很小。有盆腔疼痛史的患者未发现额外的耻骨联合扩张性。
