A bursa between the abdominal portion of obturator internus and the lateral pelvic wall, reducing friction as the muscle passes from its broad pelvic origin over the lesser sciatic notch. It is distinct from the ischiorectal fossa bursa associated with the tendon below the lesser sciatic notch.
Obturator internus abdominal bursitis contributes to deep pelvic pain and posterior hip pain, often confused with sciatic nerve irritation or piriformis syndrome. It may be compressed by an obturator hernia or pelvic haematoma. MRI of the pelvis identifies the bursal fluid collection within the obturator canal region. It is encountered in athletes with repetitive hip external rotation loading.
Deep pelvic or posterior hip pain from bursal inflammation at the obturator internus origin, reproduced by resisted hip external rotation and distinguished from piriformis syndrome by its more anterior pelvic location.
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