Obturator internus syndrome
Left hip pain. MRI requested to rule out avascular necrosis.
Plain MRI of pelvis and left hip joint
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PD and STIR hyperintense signals are seen along the tendinous fibres of left obturator internus with a small T1/T2 hypointense lesion within the obturator internus bursa, favoring calcific tendinitis.
The study of the hip joint is unremarkable with no features of septic arthritis or avascular necrosis.
Hip pain can be attributed to a number of causes in and around the hip joint and understanding the anatomy of the hip joint and it's associated bursae will help solve some less common causes of hip pain.
Obturator internus bursa is one of the less commonly visualized bursa among the 20 odd bursae around the hip joint. It is typified by it's classical 'boomerang' appearance on axial images and appears on MRI only when it is inflamed.
- Swezey, R. L. "Obturator internus bursitis: a common factor in low back pain." Orthopedics 16.7 (1993): 783-5.
- Cox, James M., and Barclay W. Bakkum. "Possible generators of retrotrochanteric gluteal and thigh pain: the gemelli–obturator internus complex." Journal of manipulative and physiological therapeutics 28.7 (2005): 534-538.
- Hwang, Ji Young, Sun Wha Lee, and Jong Oh Kim. "MR imaging features of obturator internus bursa of the hip." Korean Journal of Radiology 9.4 (2008): 375-378.