Disable ads (and more) with a membership for a one time $2.99 payment
Lateral epicondylitis most commonly affects which muscle?
Flexor carpi radialis
Extensor carpi radialis brevis
Brachioradialis
Triceps brachii
The correct answer is: Extensor carpi radialis brevis
Lateral epicondylitis, commonly known as "tennis elbow," primarily affects the extensor carpi radialis brevis muscle. This muscle is responsible for the extension and stabilization of the wrist during activities that involve gripping or wrist movements. In lateral epicondylitis, repetitive motions, such as those found in tennis or other racquet sports, can lead to microscopic tears and inflammation in the tendons where this muscle connects to the lateral epicondyle of the humerus. As a result, individuals often experience pain and discomfort in that region, especially when performing actions that require wrist extension or gripping. Understanding the specific involvement of the extensor carpi radialis brevis in this condition helps in both diagnosis and treatment, as focusing on this muscle through targeted therapy may aid in recovery. The other options listed, while they are muscles of the forearm, are not primarily involved in lateral epicondylitis, thus highlighting the significance of the extensor carpi radialis brevis in this condition.