The ischial bursa of obturator internus lies between the obturator internus tendon and the cartilage-covered lesser sciatic notch, where the tendon turns almost at a right angle to pass out of the pelvis. It is separate from the subtendinous bursa of obturator internus, which lies near the tendon's insertion on the greater trochanter.
| Location | Between the obturator internus tendon and the lesser sciatic notch of the ischium, where the tendon turns sharply to leave the pelvis |
|---|---|
| Nearby |
|
Reduces friction as the obturator internus tendon bends around the lesser sciatic notch during hip rotation
Inflammation of this bursa is an uncommon cause of deep buttock pain and may be confused with piriformis syndrome or pudendal nerve irritation because of its position near the lesser sciatic foramen. It can be identified on MRI or targeted under image guidance for injection.
Inflammation of the bursa at the lesser sciatic notch producing deep buttock pain worsened by sitting and resisted external rotation of the hip.
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