Anconeus epitrochlearis muscle
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The anconeus epitrochlearis muscle is an accessory muscle of the upper limb at the medial aspect of the elbow. It is also known as the accessory anconeus muscle or epitrochleoanconeus muscle and should not be confused with the anconeus muscle which is present at the lateral aspect of the elbow.
The muscle may be unilateral but has been found to be bilateral in one of four patients with cubital tunnel syndrome 2. It is present in ~15% (range 3-28%) of the population 3.
- medial epicondyle (inferior surface)
- olecranon (medial cortex)
Axial MR images may demonstrate a mass superficial to the cubital tunnel, where there should normally only be fat.
- 1. Stoller DW. Magnetic Resonance Imaging in Orthopaedics and Sports Medicine, 3e. Lippincott Williams & Wilkins. (2007) ISBN:0781773571. Read it at Google Books - Find it at Amazon
- 2. Sookur PA, Naraghi AM, Bleakney RR et-al. Accessory muscles: anatomy, symptoms, and radiologic evaluation. Radiographics. 2008;28 (2): 481-99. Radiographics (full text) - doi:10.1148/rg.282075064 - Pubmed citation
- 3. Stein JM, Cook TS, Simonson S et-al. Normal and variant anatomy of the elbow on magnetic resonance imaging. Magn Reson Imaging Clin N Am. 2011;19 (3): 609-19. doi:10.1016/j.mric.2011.05.002 - Pubmed citation
- 4. Okamoto M, Abe M, Shirai H, Ueda N. Diagnostic ultrasonography of the ulnar nerve in cubital tunnel syndrome. (2000) Journal of hand surgery (Edinburgh, Scotland). 25 (5): 499-502. doi:10.1054/jhsb.1999.0350 - Pubmed