RESUMEN
The term posterolateral rotatory instability (PLRI) was coined in 1991 by O'Driscoll to describe the instability of the elbow caused by injury to the lateral ulnar collateral ligament (LUCL). This condition, which is usually preceded by a traumatic dislocation of the elbow, is the most common type of chronic instability of the elbow. In this type of instability, the radius and ulna rotate externally in relation to the distal humerus, leading to posterior displacement of the radial head relative to the capitellum. lateral elbow pain, clicking, popping and snapping are possible symptoms. The diagnosis of PLRI relies on a high index of suspicion and on a detailed physical examination. Several tests have been described including apprehension tests and examination under anesthesia. Surgical treatment with reconstruction of the lateral collateral ligament complex yields successful results. In this review we summarize the current knowledge of the pathoanatomy, presentation, physical examination, diagnostic tests and management of chronic posterolateral rotatory instability of the elbow.