Retroversion of the humerus in the throwing shoulder of college baseball pitchers.

Journal Article

Increased external rotation and decreased internal rotation have been noted to occur progressively in the throwing shoulder of baseball pitchers.Proximal remodeling of the humerus contributes to the rotational asymmetry between shoulders in pitchers.Descriptive anatomic study.Both shoulders of 19 male college baseball pitchers were evaluated and retroversion of the humerus calculated by using the technique of Söderlund et al. Measurements were taken of passive glenohumeral external rotation at 0 degrees and 90 degrees of abduction and internal rotation at 90 degrees of abduction under a 3.5-kg load. Subjects completed a questionnaire on the amount and duration of overhead throwing performed during the ages 8 through 16 years.All of the subjects had greater external rotation at 0 degrees and 90 degrees of abduction, decreased internal rotation at 90 degrees of abduction, and greater retroversion of the humerus in their dominant compared with nondominant shoulders. A significant difference was found between dominant and nondominant external rotation at 0 degrees and 90 degrees of abduction, internal rotation at 90 degrees of abduction, and retroversion of the humerus. In the dominant arm, there was a significant correlation between retroversion of the humerus and external rotation at 0 degrees and 90 degrees of abduction. There was also a significant correlation between the side-to-side difference in retroversion of the humerus compared with the side-to-side difference in external rotation at 90 degrees of abduction.Rotational changes in the throwing shoulder are due to bony as well as soft tissue adaptations.

Full Text

Duke Authors

Cited Authors

  • Osbahr, DC; Cannon, DL; Speer, KP

Published Date

  • May 2002

Published In

Volume / Issue

  • 30 / 3

Start / End Page

  • 347 - 353

PubMed ID

  • 12016074

Electronic International Standard Serial Number (EISSN)

  • 1552-3365

International Standard Serial Number (ISSN)

  • 0363-5465

Digital Object Identifier (DOI)

  • 10.1177/03635465020300030801

Language

  • eng