权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

A electromyographic study of the function of the biceps in patients with rotator cuff tears.

肩袖撕裂患者二头肌功能的肌电图研究。

基本信息

批准号：
07671565
负责人：
ITOI Eiji
金额：
$ 0.9万
依托单位：
AKITA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07671565/
关键词：
biceps brachii rotator cuff tear electromyography 肩関節肩不安定症

项目摘要

Eighteen shoulders of 16 patients who had full-thickness tears of the rotator cuff and who were able to elevate their arms more than 120ﾟ were enrolled in this study (cuff-tear group). The diagnosis of rotator-cuff tear was established either by arthrography or magnetic resonance imaging (MRI). As a control, 22 asymptomatic shoulders with normal MRI findings of the rotator cuff were studied. Electromyographic activities of the biceps were investigated to fetermine the role of the biceps in cuff-deficient shoulders. Using surface electrodes, biceps activities were recorded during arm elevation in the scapular plane with and without 1-kg load. The percentages of integrated electromyograms to those during maximum voluntary contraction (%MVC) were obtained at 30ﾟ, 60ﾟ, 90ﾟ, and 120ﾟ of elevation.In the normal shoulders, %MVC of the biceps was always less than 10% through the arc of elevation both with and without load. Among 18 shoulders with rotator-cuff tears, 6 shoulders showed increased activities of the biceps more than 10% in %MVC (p<less than or equal>0.0042), whereas the rest 12 showed activities similar to the normal shoulders. The biceps activities in these 6 shoulders increased with load application (p=0.0395) and in higher angles of elevation (p=0.0003). The muscle strength tended to be weaker in shoulders with increased biceps activities than in those without. Increased activities of the biceps suggest a potential supplemental function of this muscle in shoulders with rotator-cuff

16名肩袖全层撕裂患者的18个肩膀，能够将手臂抬高超过120瓣，被纳入这项研究（肩袖撕裂组）。肩袖撕裂的诊断是通过关节造影或磁共振成像（MRI）建立的。作为对照，22例肩袖MRI检查正常的无症状肩被研究。研究了肱二头肌的肌电图活动，以确定肱二头肌在袖带缺陷肩部中的作用。使用表面电极，在有和没有1公斤负荷的情况下，记录肩胛骨平面手臂抬高时肱二头肌的活动。在抬高30、60、90和120时，综合肌电图与最大自主收缩时的百分比（%MVC）。在正常肩部，无论是负重还是无负重，肱二头肌的%MVC始终小于10%。在18个肩袖撕裂的肩部中，有6个肩部在%MVC中肱二头肌活动增加超过10% (p<小于或等于>.0042)，而其余12个肩部的活动与正常肩部相似。这6个肩部的肱二头肌活动随着负荷的增加而增加（p=0.0395），随着仰角的增加而增加（p=0.0003）。肱二头肌活动增加时，肩部肌肉力量往往比没有肱二头肌活动的人弱。肱二头肌活动的增加提示肱二头肌与肩袖有潜在的补充功能