What results from the repetitive actions causing lateral epicondylitis?

Lateral epicondylitis, commonly referred to as tennis elbow, is characterized by pain and tenderness on the outer part of the elbow. This condition primarily arises from repetitive use or overuse of the forearm muscles, particularly those involved in extending the wrist and fingers. The primary tendon affected in lateral epicondylitis is the extensor carpi radialis brevis.

When repetitive actions, such as gripping or lifting, are performed, they create excessive tension and stress on the extensor carpi radialis brevis tendon. This results in microtears within the tendon structure, leading to pain and inflammation. Over time, the microtearing can provoke a degenerative process, which is a central feature of this condition.

While other tendons are located nearby, the specific microtears and associated symptoms of lateral epicondylitis are predominantly attributed to the extensor carpi radialis brevis tendon due to its anatomical position and function. Thus, the focus on this tendon highlights the specific pathology involved in lateral epicondylitis caused by repetitive strain.