Posterior Obturator Tubercle Of The Hip, Inferior View

Description

Posterior obturator tubercle projects from the bony margin of the obturator foramen on the ischial side of the hip bone, seen from an inferior perspective that brings the lower rim of the foramen into profile. The tubercle sits posterolateral to the pubic contributions to the obturator ring and inferior to the acetabular region, where the ischium curves toward the ischial ramus. Nearby contours of the obturator foramen outline the attachment line for the obturator membrane, with the roughened surface transitioning medially toward the pelvic brim and laterally toward the acetabulum. Small, sharp excrescences stand out. They matter. Understanding this tubercle and the adjacent obturator foramen margin helps when orienting fracture lines through the anterior column and inferior pubic ramus, where disruption of the obturator ring can alter the relationship of the obturator membrane to the obturator canal. Surgeons and radiologists track this bony rim when considering entrapment or traction on the obturator nerve and vessels, which course along the superior aspect of the foramen but can be secondarily affected by displaced fragments or postoperative hardware near the pelvic brim. The inferior viewpoint emphasizes the three-dimensional relief of the foramen edge, making subtle projections easier to distinguish from smooth cortical arcs that can be mistaken for normal variants on oblique pelvic imaging. Orthopedic and pelvic anatomy teaching sessions can pair this illustration with acetabular approach discussions (including intrapelvic and anterior column work) to reinforce landmarks on the ischium and pubis that guide safe screw trajectories around the obturator region. Medical publishers often use this type of focused bony detail in chapters on pelvic ring injury classification, obturator hernia anatomy, and regional anesthesia planning for obturator nerve block. Anatomical accuracy verified by SciePro's Medical Advisory Board.