Epicondylitis of the elbow is a misnomer because it is neither primarily a disease of the epicondyle, nor is it exclusively inflammatory (as the suffix “itis” would suggest).
Instead, epicondylitis is a condition of degenerative tendinopathy within the wrist extensor tendon (as in lateral epicondylitis) or flexor tendon (as in medial epicondylitis), tendons which originate at the elbow.
The common term “tennis elbow” refers to lateral epicondylitis which affects the origin of the wrist extensor muscles, while the term “golfer’s elbow” refers to medial epicondylitis which affects the origin of the flexor/pronator muscles.
Epicondylitis is an overuse injury in which the rate of tendon damage exceeds the rate of tendon repair. This disequilibrium causes pain at the elbow and, ultimately, leads to impaired function - primarily in tasks that involve a power grip and require a stable wrist joint.
Full Article - https://www.orthopaedia.com/lateral-and-medial-epicondylitis-of-the-elbow/
