.Tennis elbow is a tendinopathy of the common extensor origin of the lateral elbow. In former times the condition was usually named 'lateral epicondylitis'. However, the pathology is no longer thought to be inflammatory. Nowadays the accurate description wound be 'partially reversible but degenerative overuse-underuse tendinopathy'. Because of the complexity of this description, usually the term 'tennis elbow' is used.
The main clinical symptoms are pain on resisted movements (particularly resisted third finger extension) and tenderness at the lateral epicondyle, with normal elbow range of motion. Diagnosis is based on the clinical features of the disease. Diagnostic imaging should be considered to rule out other causes of elbow pain or to establish the diagnosis of tennis elbow when in doubt.