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Ischiopubic Ramus

ramus ossis ischiopubicus

The ischiopubic ramus is the inferior portion of the pelvic ring where the inferior pubic ramus merges with the ischial ramus to form the floor and medial boundary of the obturator foramen. It provides attachment for the gracilis, adductor longus and brevis, obturator externus, and the muscles of the perineum. Stress fractures of the ischiopubic ramus occur in distance runners and military recruits from repetitive loading.

Anatomical Data

Structure & Landmarks

Articulations	Integral part of the pelvic ring, continuous bone between the pubic symphysis and ischial tuberosity
Landmarks	Not directly palpable due to perineal and medial thigh soft tissue coverage The junction of the inferior pubic and ischial rami is identifiable on pelvic radiograph at the medial obturator foramen boundary
Ossification	The ischium and pubis fuse at their rami between ages 4 and 7, completing the inferior pelvic ring as a single bone rather than maintaining the separate apophyses of infancy.

Clinical Relevance

Clinical Notes

Ischiopubic ramus stress fractures produce groin and medial thigh pain in runners and military recruits that is reproduced by single-leg stance and may be missed on plain radiographs but identified on MRI or bone scan. The ischiopubic ramus junction (synchondrosis) in children between ages 4 and 12 has an irregular, widened appearance that is a normal variant (Van Neck disease) sometimes confused with osteomyelitis or tumour on radiograph.

Pathology

Common Injuries & Conditions

Pubic Ramus Fracture

Fractures of the inferior ramus often accompany superior ramus fractures in low-energy falls or pelvic ring injuries.

Ischiopubic Synchondrosis (van Neck Odelberg Disease)

Asymmetric enlargement at the fusing junction of the ischium and pubis in children can cause pain and mimic a tumour or fracture.

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