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Glenoid Stress Distribution in Baseball Players Using Computed Tomography Osteoabsorptiometry: A Pilot Study

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Title: Glenoid Stress Distribution in Baseball Players Using Computed Tomography Osteoabsorptiometry: A Pilot Study
Authors: Shimizu, Tomohiro Browse this author
Iwasaki, Norimasa Browse this author →KAKEN DB
Nishida, Kinya Browse this author
Minami, Akio Browse this author →KAKEN DB
Funakoshi, Tadanao Browse this author →KAKEN DB
Issue Date: Jun-2012
Publisher: Springer New York
Journal Title: Clinical Orthopaedics and Related Research
Volume: 470
Issue: 6
Start Page: 1534
End Page: 1539
Publisher DOI: 10.1007/s11999-012-2256-0
Abstract: Background: It is important to understand the loading conditions when considering the pathology of shoulder disorders in overhead athletes. However, because throwing is a complicated motion, direct measurement of the stress distribution across the glenohumeral joint is difficult. Subchondral bone density reportedly reflects the cumulative stress acting on a joint surface under actual loading conditions. Questions/Purposes: To assess alterations in stress distribution across the glenoid cavity caused by pitching, we investigated the distribution of subchondral bone density in nonathletic volunteers and asymptomatic baseball players, including fielders and pitchers. Methods: We collected computed tomography (CT) imaging data from the dominant-side shoulder of 10 nonathletic volunteers (controls), 10 fielders, and 10 pitchers in a competitive college baseball league (all men aged 19-24 years, mean 20.7 years). We measured the distribution of subchondral bone density of the glenoid cavity using CT osteoabsorptiometry. The obtained stress distribution map was divided into four segments: anterosuperior, anteroinferior, posteroinferior, and posterosuperior regions. The location and percentages of high-density regions on the articular surface were analyzed quantitatively. Results: The percentages of high-density regions, including the anteroinferior, and posterior segments, were greater in pitchers and fielders than in controls. The percentages of high-density regions did not differ significantly between pitchers and fielders. Conclusions: The bicentric density patterns indicate that the cumulative force of pitching activity affected the long-term stress distribution across the glenoid cavity. Clinical Relevance: The current results provide useful information for analyzing pitching activity and clarifying the pathology of shoulder disorders associated with throwing.
Rights: The original publication is available at
Type: article (author version)
Appears in Collections:北海道大学病院 (Hokkaido University Hospital) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 船越 忠直

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