Why does rapid elbow extension during a baseball pitch increase risk of ulnar collateral ligament (UCL) tears more than slower extension?

💡 Explanation

Rapid elbow extension generates high valgus stress due to momentum and lever arm biomechanics. The UCL experiences tensile forces during this motion, and a tear occurs when valgus stress exceeds the tissue's yield strength, because the tissue cannot withstand the applied load. Therefore, UCL rupture is more likely with rapid extension, rather than with slower movements that allow for better force distribution.

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