Obturator Externus Bursa

bursa m. obturatorii externi

A bursa between the obturator externus tendon and the posterior hip capsule, where the tendon passes inferior to the joint to insert on the trochanteric fossa. It reduces friction as the tendon wraps around the posterior ischium during hip external rotation.

Region: Thigh

Clinical Relevance

Clinical Notes

Obturator externus bursitis produces deep posterior groin pain reproduced by resisted external hip rotation, particularly in the flexed hip. It lies adjacent to the ischiofemoral space and the posterior hip capsule, creating potential confusion with ischiofemoral impingement. MRI demonstrates peritendinous signal change at the obturator externus trochanteric fossa insertion. Ultrasound-guided injection targeting the bursa confirms the diagnosis and provides temporary relief in athletes with posterior hip pain.

Pathology

Common Injuries & Conditions

Obturator Externus Tendinobursitis

Bursal and tendinous inflammation at the obturator externus insertion producing deep posterior groin pain with external hip rotation, managed with targeted injection and hip external rotator strengthening.