Relationship between humeral torsion and injury in professional baseball pitchers
Overhead throwing athletes can develop several morphological adaptations in order to lengthen the throwing arc, and to achieve the highest possible angular velocity towards humeral internal rotation during the throwing motion. Apart from soft tissue changes, the degree of humeral torsion can contribute to a shift in rotational ROM of the glenohumeral joint.
Greater humeral torsion requires less external rotation of the humeral head during late cocking and thus puts less stress on soft tissue structures surrounding the shoulder joint. This study examined the relationship between humeral torsion and injury incidence and severity in baseball pitchers.
No association was present between the degree of humeral torsion and overall injury incidence, but a strong inverse relationship was found between the degree of humeral torsion and the incidence of severe injuries. Among injured players, a strong inverse association was present between the degree of humeral torsion and severity of the injury.
Pitchers with lower degrees of humeral torsion and smaller side-to-side difference tended to have more severe injuries. These findings are consistent with the proposed pathophysiology of throwing injuries. > From: Polster et al., Am J Sports Med 41 (2013) 2015-2021. All rights reserved to The Author(s).
Visit the Pubmed summary for more information or your article access. Want to read more into humeral torsion? See this earlier post!