The lateral ulnar collateral ligament (LUCL) of the elbow has been illustrated variably in anatomy texts. The purpose of this investigations was to determine the percentage of specimens in which this structure is present, and to describe its anatomy and function. The LUCL was identified as part of the lateral capsulo‐ligamentous complex in 17 of 17 fresh frozen cadaver elbows (P <.0001). The LUCL originates on the lateral epicondyle, blends with the fibers of the annular ligament as it arches superficial to it, then curves to insert on the tubercle of the supinator crest of the ulna. It is distinct at its insertion, but not at its origin where its fibers blend with those of the common extensor origin. The insertion is exposed in the interval created between (the deep surface of) the fascia of the supinator and its muscle fibers. The insertion can be palpated by applying a varus stress to the elbow. Cutting the ulnar fibers permitted posterolateral rotatory subluxation of the ulno‐humeral joint and varus subluxation of the elbow. © 1992 Wiley‐Liss, Inc.
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