Acute changes in glenohumeral range-of-motion following in-season minor league pitching starts

作者：Jordan M. Case, Sandeep Mannava, Joshua H. Fallin, Austin V. Stone, Michael T. Freehill · 发表于：The Physician and Sportsmedicine · 年份：2015 · DOI：10.1080/00913847.2015.1059249 · 被引用次数：19 · 研究领域：Shoulder Injury and Treatment、Elbow and Forearm Trauma Treatment、Shoulder and Clavicle Injuries

BACKGROUND: Asymmetric glenohumeral range-of-motion (ROM) between the throwing and non-throwing arms of overhead athletes has been well described in the literature. Thresholds of internal rotation (IR) loss have been associated with throwing arm injury in baseball players. Acute changes in shoulder ROM following an individual pitching appearance remain poorly understood. OBJECTIVES: To determine the acute change of external rotation (ER), IR, and total arc-of-motion (TAM) in minor league starting pitchers immediately following an in-season starting pitching appearance. METHODS: Nine minor league starting pitchers participated in the study with data collected for 22 individual starts. IR, ER and TAM were measured in the throwing shoulder and non-throwing shoulder at three time points for each appearance: before, immediately following, and at 24 hours following the pitching appearance. RESULTS: In the throwing arm, IR significantly decreased (49.4 vs 46.0, p = 0.037) immediately after pitching, and ER significantly increased immediately following an appearance (150.7 vs 153.6, p = 0.030) and at 24 hours (150.7 vs 154.0, p = 0.028). No difference was detected in throwing arm TAM and IR at 24 hours, or TAM immediately following an appearance. CONCLUSIONS: Minor league pitchers demonstrate the dynamic glenohumeral ROM changes after starting appearances of increased ER and diminished IR with maintenance of TAM. At 24 hours, the observed loss of IR had resolved, whereas the gains in...