Original articleLoss of total arc of motion in collegiate baseball players
Section snippets
Materials and methods
Dominant and nondominant shoulders of collegiate-level baseball players were examined for shoulder range of motion, including external and internal rotation at 90° of abduction. Also recorded were age, arm dominance, position, prior history of pain in the shoulder, and prior history of shoulder surgery. All players with a prior history of shoulder surgery were excluded from the study. Pain in the shoulder at the time of the examination was categorized as none, mild (no loss in strength or
Results
A total of 67 college-level baseball players were examined. The mean player age was 19.5 years, with an age range of 17 to 25 years. Of the players, 59 (88%) were right-handed and 8 (12%) were left-handed. Of the overhand throwers, 37 (55%) had no history of shoulder pain, 10 (15%) had mild pain, 12 (18%) had moderate pain, and 8 (12%) had severe pain. There were 26 pitchers (39%) and 41 fielders (61%) in the study group. Of the 41 fielders, 7 were catchers, 16 were infielders, and 18 were
Discussion
Several theories have been proposed to explain the change in total arc of motion in the overhand thrower. These include posterior capsular contracture, anterior capsular plastic deformation, and increased humeral retroversion.7, 8, 12, 13, 15, 16, 17, 18, 19 This study was designed to evaluate the shoulder motion in collegiate-level baseball players, comparing the difference between dominant and nondominant shoulders. Specifically, attention was directed toward internal rotation deficit and
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