![]() ![]() However, its diagnosis and treatment are notable for some controversy among providers. Radial tunnel syndrome can coexist with tendinitis, which occurs at the outer elbow and is also called lateral epicondylitis (tennis elbow). Pain and weakness can occur if the nerve is compressed by swelling or tightness in the tunnel. ![]() Within the tunnel, the radial nerve divides into two branches: One branch provides sensation, and the other powers the forearm muscles. The area where the muscles overlap on the top of the forearm is called the radial tunnel. Finally, it gives feeling or sensation to the back of the arm, forearm, and hand. It also powers the muscles that rotate the forearm so the palm is facing up or down. 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. 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).
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