ulnar nerve subluxation
Abnormal movement of the ulnar nerve over the medial epicondyle during elbow flexion, causing symptoms in throwing athletes.
Full Definition
Ulnar nerve subluxation occurs when the ulnar nerve abnormally displaces over the medial epicondyle of the humerus during elbow flexion, rather than remaining in its normal groove. This condition is particularly problematic in overhead throwing athletes, such as baseball pitchers and tennis players, who repetitively flex and extend their elbows under load. The subluxation can lead to nerve irritation, inflammation, and eventual neuropathy. Symptoms include medial elbow pain, numbness and tingling in the ulnar nerve distribution (fourth and fifth fingers), and potential weakness in grip strength. Clinical examination may reveal a palpable snapping sensation over the medial epicondyle during elbow motion. Treatment options range from conservative management with activity modification to surgical transposition of the nerve.
Usage
Usage note: Distinguished from ulnar collateral ligament injuries by neurological symptoms.
In Context
- "The pitcher experienced ulnar nerve subluxation with associated tingling in the ring and little fingers." — Sports medicine consultation
- "Electromyography confirmed ulnar nerve subluxation with mild conduction delay across the elbow." — Neurophysiology report