The Relationship between the Step Side Knee Joint Movement and Elbow Valgus Torque

Abstract

Purpose: The purpose of this study was to investigate that the characteristic of the step leg motion that increase elbow valgus torque.

Method: Twenty-seven youth baseball pitchers participated in this study. Elbow valgus torque measurement and video analysis were performed on outdoor mound. The participants divided by the qualitative assessment of stride knee motion, then compared elbow valgus torque and flexion angle of step knee joint between both groups.

Result: There was significant greater flexion knee joint angle at maximum external rotation and ball release and greater joint torque of elbow and less ball speed for the forward movement group.

Conclusion: This group showed inadequate bracing the knee of step leg. It caused increasing elbow torque. To evaluate the stride leg motion is important for assessment of risk on elbow injury.