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Journal of the Korean Academy of Rehabilitation Medicine 2010;34(3):316-324.
The Activities of Trapezius and Deltoid in Rotator Cuff Tear Patients Injected Local Anesthetics in Subacromial Space.
Jun, Ah Young , Choi, Eun Hi , Yoo, Yon Sik , Park, Dong Sik , Nam, Hee Seung
1Department of Rehabilitation Medicine, Hallym University College of Medicine, Korea. ceh@hallym.or.kr
2Department of Orthopedic Medicine, Hallym University College of Medicine, Korea.
견봉하 마취제를 투여한 회전근개 파열 환자의 승모근과 삼각근의 활성도
전아영, 최은희, 유연식1, 박동식, 남희승
한림대학교 의과대학 재활의학교실, 1정형외과학교실
To investigate the activities of upper trapezius and deltoid muscles in shoulder abduction in full can and empty can position in rotator cuff tear patients.
Twelve subjects with right rotator cuff tear patients participated in this study. Each subject performed scapular plane abduction with humeral external rotation (full can position) and with humeral internal rotation (empty can position). Electromyography (EMG) was recorded with surface electrodes at the both upper trapezius, anterior, lateral, and posterior deltoid muscles during shoulder abduction. The EMG activity of each muscle was normalized according to the highest EMG activity during a maximum manual muscle test for the corresponding muscle.
Muscle activities of the lesion side's upper trapezius and lateral deltoid were significantly greater than those of the normal side in full can position. In empty can position, the activities of upper trapezius, anterior, and lateral deltoid increased in lesion side. In comparison between full can and empty can exercises, over 30o abduction arcs, empty can exercise showed increased muscle activities of upper trapezius and all deltoid muscle in lesion side. In contrast, anterior and lateral deltoid only showed increased in the muscle activities under empty can exercise in sound side.
Rotator cuff tear is involved in changed the activities of upper trapezius and deltoid muscles. And these results suggested that in rotator cuff tear patients, the changed pattern of muscle contraction should be considered in shoulder exercise. (J Korean Acad Rehab Med 2010; 34: 316-324)
Key Words: Shoulder, Rotator cuff, Electromyography, Lidocaine
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