Influence of shoulder abduction and lateral trunk tilt on peak elbow varus torque for college baseball pitchers during simulated pitching

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Bibliographic Details
Title translated into German:Einfluss der Schulterabduktion und der lateralen Rumpfneigung auf den Höhepunkt des Drehmoments bei Varusstellung des Ellenbogengelenks bei College Baseballpitchern während simuliertem Pitchen
Author:Matsuo, Tomoyuki; Fleisig, Glenn S.; Zheng, Naiquan; Andrews, James R.
Published in:Journal of applied biomechanics
Published:22 (2006), 2, S. 93-102, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
ISSN:1065-8483, 1543-2688
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Identification number:PU200708002166


Elbow varus torque is a primary factor in the risk of elbow injury during pitching. To examine the effects of shoulder abduction and lateral trunk tilt angles on elbow varus torque, we conducted simulation and regression analyses on 33 college baseball pitchers. Motion data were used for computer simulations in which two angles—shoulder abduction and lateral trunk tilt—were systematically altered. Forty-two simulated motions were generated for each pitcher, and the peak elbow varus torque for each simulated motion was calculated. A two-way analysis of variance was performed to analyze the effects of shoulder abduction and trunk tilt on elbow varus torque. Regression analyses of a simple regression model, second-order regression model, and multiple regression model were also performed. Although regression analyses did not show any significant relationship, computer simulation indicated that the peak elbow varus torque was affected by both angles, and the interaction of those angles was also significant. As trunk tilt to the contralateral side increased, the shoulder abduction angle producing the minimum peak elbow varus torque decreased. It is suggested that shoulder abduction and lateral trunk tilt may be only two of several determinants of peak elbow varus torque. Verf.-Referat