According to the 2002 Major League Baseball Disability Analysis, almost 70% of players on the disabled list are pitchers and throwing arm related injuries account for 53% of all disabled list placements. To reach a high ball speed, pitchers cock, or excessively externally rotate their pitching arm to or near an extreme ROM of 180° . The shoulder is then immediately internally rotated to an astonishing 7000°/s after the leading foot contact. The excessive external rotation ROM and astonishing internal rotation velocity are thought to contribute to injury . Repeated exposure to the excessive ROM and large shoulder loads may cause excessive laxity to the anterior shoulder and/or damage the soft tissue . This can lead to shoulder instability and excessive humeral head translation that may cause impingement . Therefore, the mobility and stability of the thrower’s shoulder are extremely relevant to performance and injury prevention.
- Bioengineering Division
Shoulder Rotation Laxity is Related to Pitching Mechanics
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Wang, H, Eaton, K, & Zheng, N. "Shoulder Rotation Laxity is Related to Pitching Mechanics." Proceedings of the ASME 2011 Summer Bioengineering Conference. ASME 2011 Summer Bioengineering Conference, Parts A and B. Farmington, Pennsylvania, USA. June 22–25, 2011. pp. 631-632. ASME. https://doi.org/10.1115/SBC2011-53307
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