| Project/Area Number |
09671468
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Orthopaedic surgery
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| Research Institution | Akita University |
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Principal Investigator |
ITOI Eiji Akita University School of Medicine, Department of Orthopedic Surgery, Lecturer, 医学部, 講師 (80193465)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Wataru Akita University School of Medicine, Department of Orthopedic Surgery, Assistant, 医学部, 助手 (50167186)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1998: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1997: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | rotator cuff tear / biceps brachii / shoulder stabilizer / 筋電図 / 肩関節筋力 |
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| Research Abstract |
We found that in some of the shoulders with rotator cuff tears, electromyographic activities of the biceps increased. The purpose of this study was to determine the stabilizing function of the biceps in shoulders with rotator cuff tears. We investigated 15 shoulders with rotator cuff tears and 19 normal shoulders. A custom-designed brace was used to apply 1.5-kg load to the biceps. Anteroposterior roentgenograms were taken at 0, 45, and 90 degrees of elevation with and without biceps loading. The center of the humeral head relative to the glenoid was obtained using an NIH image. Without biceps loading, the head shifted superiorly in cuff-tear shoulders : superior shift was significant at 0 and 45 degrees compared to the normal shoulders. With biceps loading, the superior migration of the head was suppressed in both groups. There were no significant differences in the head position between the groups. The results indicate that the biceps functions to stabilize the head superiorly in shoulders with rotator cuff tears.
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