Glenoid Stress Distribution in Baseball Players Using Computed Tomography Osteoabsorptiometry: A Pilot Study
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- 作者：Tomohiro Shimizu MD (1)
Norimasa Iwasaki MD ; PhD (1)
Kinya Nishida MD ; PhD (1)
Akio Minami MD ; PhD (1)
Tadanao Funakoshi MD ; PhD (1) - 刊名：Clinical Orthopaedics and Related Research?
- 出版年：2012
- 出版时间：June 2012
- 年：2012
- 卷：470
- 期：6
- 页码：1534-1539
- 全文大小：352KB
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Norimasa Iwasaki MD, PhD (1)
Kinya Nishida MD, PhD (1)
Akio Minami MD, PhD (1)
Tadanao Funakoshi MD, PhD (1)
1. Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Kita 15 Nishi 5 Kita-ku Sapporo, Hokkaido, 0608368, Japan
文摘
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 and methods to directly determine stress distribution are complex, direct measurement of the stress distribution across the glenohumeral joint has not been attempted. 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 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 19-4?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. We quantitatively analyzed the location and percentages of high-density regions on the articular surface. 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 between pitchers and fielders. Conclusions The bicentric density patterns indicated that the cumulative force of pitching activity affected the long-term stress distribution across the glenoid cavity. Clinical Relevance Our data should be useful for analyzing pitching activity and clarifying the pathology of shoulder disorders associated with throwing.