Oliver Bee RMTRegistered Massage Therapist

Massage therapy · Kitchener–WaterlooRadial Tunnel Syndrome

Elbow, Wrist & Hand

What It Is

Radial tunnel syndrome isn't as well known as carpal tunnel syndrome, but it can cause a nagging pain on the outside of the elbow that stretches down into the forearm (Cleveland Clinic, n.d.). It happens when tightness and swelling in the radial tunnel put too much pressure on the radial nerve (Cleveland Clinic, n.d.). Over time, it can weaken the forearm muscles and wrist strength, making it harder to grip or lift things (Cleveland Clinic, n.d.). Treatment is usually non-surgical, and rest and medical treatment relieve symptoms within about six weeks for most people (Cleveland Clinic, n.d.). However, some people do not improve with non-surgical treatment, and surgery might then be needed to reduce the pressure on the nerve (Levina and Dantuluri, 2021).

Radial tunnel syndrome is sometimes confused with tennis elbow, as both cause pain in the same area, and the two conditions can occur together (Levina and Dantuluri, 2021; Engin et al., 2023). It should also not be confused with carpal tunnel syndrome, which is compression of the median nerve at the wrist. Radial tunnel syndrome typically does not cause numbness or tingling in the fingers (Engin et al., 2023).

In radial tunnel syndrome the nerve is compressed around the elbow and upper forearm, compared with the wrist in carpal tunnel syndrome.

Radial Tunnel Syndrome Anatomy

As the name suggests, the nerve that becomes trapped or compressed is the radial nerve. To be specific, it is a branch of the radial nerve called the posterior interosseous nerve (Levina and Dantuluri, 2021). Day to day activities that can contribute to this include repeating the same motions over and over (such as typing or using a screwdriver), push-and-pull movements such as throwing, excessive gripping, pinching or bending of the wrist, and a direct, hard blow to the outside of the elbow or forearm (Cleveland Clinic, n.d.). Poor posture when using a computer and keyboard may also play a part.

The radial tunnel is about 5 cm long. It starts at the elbow joint, where the radius meets the upper arm bone (humerus), and runs down to the supinator muscle in the upper forearm, where the nerve passes under a band of tissue known as the arcade of Frohse (Levina and Dantuluri, 2021). If there is thickening or tightness in this area, the nerve can become compressed. The radius is the forearm bone on the thumb side, and the part of it at the elbow is known as the radial head.

Not a diagnosis — for more information, contact me or another trusted healthcare provider.

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