The posterior band of the UCL runs from the medial epicondyle to the medial olecranon, forming the posterior component of the medial ligamentous complex. It provides secondary valgus resistance in elbow extension.
Resists valgus stress in elbow extension (0-60 degrees), contributes to posterior medial elbow stability, and participates in the valgus extension overload syndrome seen in throwers who develop posteromedial osteophytes.
Posterior UCL band involvement in valgus extension overload produces posteromedial olecranon osteophytes from repetitive abutment. Olecranon tip osteophyte resection combined with posterior band UCL assessment addresses valgus extension overload syndrome in throwers.
Posterior UCL band laxity combined with repetitive valgus loading producing posteromedial olecranon osteophyte formation, pain at terminal extension, and loose bodies in throwing athletes.
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