Presentation
Ulnar-sided wrist pain of several months' duration
Patient Data
The extensor carpi ulnaris (ECU) tendon demonstrates medial palmar subluxation from its fibro-osseous tunnel. The tendon is subluxed into the pouch formed by stripping of the subsheath at its palmar attachment. Associated patchy area of bone marrow edema is seen involving the ulnar styloid process evoking a high STIR signal. Negative ulnar variance.
The extensor carpi ulnaris (ECU) tendon (red arrow) demonstrates medial palmar subluxation from its fibro-osseous tunnel (blue arrow).
Case Discussion
MR picture of extensor carpi ulnaris subluxation.
Subluxation or dislocation of the ECU tendon is associated with an injury to the ECU subsheath which may remain intact but stripped at its palmar/ulnar attachment, forming a false pouch into which the ECU tendon can sublux.
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