The sacral promontory is the anterior projecting edge of the superior surface of the first sacral vertebra at the L5-S1 lumbosacral junction, forming the most prominent posterior boundary of the pelvic inlet. It is palpable on vaginal examination and is the posterior point used in obstetric measurement of the obstetric conjugate (anteroposterior pelvic inlet diameter).
The sacral promontory is the landmark for anterior lumbar interbody fusion (ALIF) at L5-S1, laparoscopic lumbar disc surgery, and sacral colpopexy for vaginal vault prolapse. The L5 nerve roots and iliac vessels are closely related at the promontory level. In laparoscopic sacrocolpopexy, a polypropylene mesh is sutured to the anterior longitudinal ligament at the sacral promontory to suspend the vaginal vault. In obstetrics, the obstetric conjugate is estimated by subtracting 1.5 cm from the measured diagonal conjugate, with a conjugate under 10 cm indicating contracted pelvis.
The approach to the L5-S1 disc through the retroperitoneal space requires retraction of the iliac vessels and identification of the median sacral artery at the sacral promontory; inadvertent injury to the left iliac vein or presacral venous plexus during this approach causes significant haemorrhage managed by direct pressure and vessel repair.
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