![]() It powers the muscles that straighten your elbow, wrist, and fingers. The radial nerve is one of the five major nerves of the upper extremity. Muscle Nerve 1999 22: 960–967.Radial tunnel syndrome is caused by a pinched nerve, called the radial nerve, that runs through the muscles on the top of the elbow and forearm (Figure 1). 16 Lister GD, Belsole RB, Kleinert HE.Abnormal signal intensity in skeletal muscle at MR imaging: patterns, pearls, and pitfalls. 15 May DA, Disler DG, Jones EA, Balkissoon AA, Manaster BJ.Pseudodefect of the capitellum: potential MR imaging pitfall. 14 Rosenberg ZS, Beltran J, Cheung YY.Radial nerve in the radial tunnel: anatomic sites of entrapment neuropathy. The anatomical relationship between the posterior interosseous nerve and the supinator muscle. 12 Thomas SJ, Yakin DE, Parry BR, Lubahn JD.The arcade of Frohse and its relationship to posterior interosseous nerve paralysis. Radial nerve entrapment at the elbow: surgical anatomy. Anatomy of the radial nerve motor branches in the forearm. 9 Abrams RA, Ziets RJ, Lieber RL, Botte MJ.A study of the PIN and the radial tunnel in 30 Thai cadavers. 8 Prasartritha T, Liupolvanish P, Rojanakit A.Radial tunnel syndrome: resistant tennis elbow as nerve entrapment. The utility of magnetic resonance imaging in evaluating peripheral nerve disorders. 6 Grant GA, Britz GW, Goodkin R, Jarvik JG, Maravilla K, Kliot M.Magn Reson Imaging Clin N Am 1997 5: 545–565. MR features of nerve disorders at the elbow. 5 Rosenberg ZS, Bencardino J, Beltran J.Lateral elbow pain and posterior interosseous nerve entrapment. 2 Barnum M, Mastey RD, Weiss AC, Akelman E.Surgical treatment of common entrapment neuropathies in the upper limbs. ![]() ![]() ![]() The rest of the patients had either normal MR imaging findings ( n = 4) or lateral epicondylitis ( n = 2).Ĭonclusion: Muscle denervation edema or atrophy along the distribution of the posterior interosseous nerve is the most common MR finding in radial tunnel syndrome. Seven (28%) patients had the following mass effects along the posterior interosseous nerve: thickened leading edge of the extensor carpi radialis brevis ( n = 4), prominent radial recurrent vessels ( n = 1), schwannoma ( n = 1), or bicipitoradial bursa ( n = 1). One patient had isolated pronator teres edema. ![]() Thirteen patients (52%) had denervation edema or atrophy within muscles (supinator and extensors) innervated by the posterior interosseous nerve. Two volunteers had borderline thickening of the leading edge of the extensor carpi radialis brevis. Results: All images of volunteers demonstrated normal morphology and signal intensity within the posterior interosseous nerve and adjacent soft tissues. MR images of the symptomatic patients were evaluated for the following: signal intensity alteration and morphologic alteration of the posterior interosseous nerve the presence of mass effect on the posterior interosseous nerve such as the presence of bursae, a thickened leading edge of the extensor carpi radialis brevis, or prominent radial recurrent vessels signal intensity alteration within the depicted forearm musculature such as edema or atrophy and signal intensity changes at the origin of the common extensor and common flexor tendons, which would suggest a diagnosis of epicondylitis. MR images of the asymptomatic volunteers were reviewed to establish the normal appearance of the radial tunnel. MR images of 10 asymptomatic volunteers (six men, four women mean age, 30 years) and 25 patients (11 men, 14 women mean age, 49 years) clinically suspected of having radial tunnel syndrome were reviewed for morphologic and signal intensity alterations of the posterior interosseous nerve and adjacent soft-tissue structures. Materials and Methods: Institutional review board approval was obtained, and informed consent was waived for the retrospective HIPAA-compliant study. Purpose: To retrospectively assess magnetic resonance (MR) imaging features of radial tunnel syndrome. ![]()
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