This study used 3D high-speed motion analysis to quantify shoulder and elbow forces and torques in 26 elite, healthy adult pitchers. It identifies the specific instants in the pitching motion when peak loads occur. The authors then map those loads onto established mechanisms of overuse injury at the elbow and shoulder.
When you see a pitcher with medial elbow pain, this paper tells you why: peak varus torque loads the UCL to roughly its failure threshold with every pitch. That single number reframes UCL injury as a fatigue phenomenon rather than a freak event, and it underlies why volume and pitch-count limits matter for prevention.
The paper also gives you a mental map of the throwing motion. Elbow and shoulder internal rotation torque peak in late cocking. Compressive and distraction loads peak in deceleration after release. Most overuse injuries cluster at these two instants.
Use this framework to reason through pathology by phase: late cocking implicates the UCL and anterior labrum, while deceleration implicates the posterosuperior cuff, biceps, and superior labrum.
Finally, the recurring theme is the flexibility-stability tradeoff. Throwers need extreme external rotation, but the same laxity increases translation and tissue loading, which is why rehab targets dynamic stability rather than simply stretching.
This study used 3D high-speed motion analysis to quantify shoulder and elbow forces and torques in 26 elite, healthy adult pitchers. It identifies the specific instants in the pitching motion when peak loads occur. The authors then map those loads onto established mechanisms of overuse injury at the elbow and shoulder.
When you see a pitcher with medial elbow pain, this paper tells you why: peak varus torque loads the UCL to roughly its failure threshold with every pitch. That single number reframes UCL injury as a fatigue phenomenon rather than a freak event, and it underlies why volume and pitch-count limits matter for prevention.
The paper also gives you a mental map of the throwing motion. Elbow and shoulder internal rotation torque peak in late cocking. Compressive and distraction loads peak in deceleration after release. Most overuse injuries cluster at these two instants.
Use this framework to reason through pathology by phase: late cocking implicates the UCL and anterior labrum, while deceleration implicates the posterosuperior cuff, biceps, and superior labrum.
Finally, the recurring theme is the flexibility-stability tradeoff. Throwers need extreme external rotation, but the same laxity increases translation and tissue loading, which is why rehab targets dynamic stability rather than simply stretching.