Anatomy:
Fibro-osseous tunnel
Posterior to medial epicondyle
Floor by posterior bundle of UCL
Roof by arcuate lig (may be absent in 25%)
Contains ulnar N and posterior recurrent ulnar A
MR:
Best seen on axials
Predominantly fat signal
Ulnar N shows int signal
Etiology:
Occupation like carpentery, painting, sewing, musical intruments
Anconeus epitrochlearis
