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Common sporting associations with extensor carpi ulnaris tendinopathy include tennis and golf Patients complain of pain on passive supination.The extensor carpii ulnaris tendon is held in a bony groove on the distal ulna by a fibrous retinaculum. On occasion, patients may complain of pain with or without a clicking sensation which is due to subluxation of extensor carpii ulnaris from its fibro osseous tunnel. Static MR imaging may demonstrate the displaced tendon, although the diagnosis is more easily reached by using dynamic ultrasound where, on successive pronation and supernation the tendon can be seen to sublux. Tenosynovitis is best appreciated on MR or ultrasound images. Increased fluid in the tendon sheath associated with signal or ultrasound changes within the tendon itself allow easy diagnosis of the stages of the disease. A prominent or previous injury to the ulnar styloid predisposes to extensor carpii ulnaris tendinopathy. Rarely infective or supporative tenosynovitis may occur. In these instances, the degree of synovial thickening on MR or ultrasound in association with marked enhancement of the tenosynovium or increased doppler signal are prominent. Aspiration will yield purulent material though it should be appreciated that chronic calcific tendinopathy may mimic all of these findings.
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Ulnar Nerve
TFCC
Tendons
Pisiform Triq Joint
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