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Ulnar Nerve Dislocation and Snapping Triceps Syndrome: Diagnosis with Dynamic Sonography—Report of Three Cases¹

¹ From the Departments of Radiology (J.A.J., D.P.F., C.W.H.) and Orthopedic Surgery (P.J.L.J., A.W.J.), University of Michigan Medical Center, 1500 E Medical Center Dr, TC-2910G, Ann Arbor, MI 48109-0326. Received October 27, 2000; revision requested December 18; revision received January 31, 2001; accepted February 26. Address correspondence to J.A.J. (e-mail: jjacobsn@umich.edu).

Initial experience with the use of dynamic sonography of the elbow for diagnosing ulnar nerve dislocation and snapping triceps syndrome is reported. Cases of three consecutive patients who underwent sonographic evaluation of the elbow and subsequent open elbow surgery for symptomatic ulnar nerve dislocation were reviewed. Dynamic sonography of the elbow was used to aid in the accurate diagnosis of and differentiation between ulnar nerve dislocation and snapping of the medial triceps muscle.

Index terms: Elbow, 422.482 • Muscles, US, 422.482 • Nerves, 422.42 • Ultrasound (US), 422.12989

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