Obturator internus bursa
Citation, DOI & article data
The obturator internus bursa is a narrow, elongated fluid pocket situated between the obturator internus tendon and the posterior surface of the ischium 1 which is usually only visible when distended with fluid. Its shape has been likened to that of a “boomerang” 1, particularly when viewed in the transverse plane.
The obturator internus bursa is normally collapsed and not visible.When distended secondary to infection or inflammation 1 it may be visible. Reports suggest that most patients with obturator internus muscle abscesses or bursitis respond well to antibiotics without surgical drainage 2,3. Understanding of the imaging features of obturator internus bursitis can therefore avoid unnecessary surgery.
- 1. Hwang JY, Lee SW, Kim JO. MR imaging features of obturator internus bursa of the hip. (2008) Korean journal of radiology. 9 (4): 375-8. doi:10.3348/kjr.2008.9.4.375 - Pubmed
- 2. Swezey RL. Obturator internus bursitis: a common factor in low back pain. (1993) Orthopedics. 16 (7): 783-5; discussion 785-6. Pubmed
- 3. Viani RM, Bromberg K, Bradley JS. Obturator internus muscle abscess in children: report of seven cases and review. (1999) Clinical infectious diseases : an official publication of the Infectious Diseases Society of America. 28 (1): 117-22. doi:10.1086/515080 - Pubmed