![]() ![]() Before superior transposition (dotted line), the subscapularis. Weakening, inflammation, or tears to the tendons or muscles of the shoulder will impair shoulder abduction.Įmployees engaged in tasks that require frequent shoulder abduction should be encouraged to perform exercises that strengthen the shoulder muscles and allowed sufficient recovery breaks to prevent the occurrence of injuries. The supraspinatus abduction moment arm (thin line) was maximal (26 mm) at 30 of abduction. The prime abductors of the arm are the supraspinatus and deltoid muscles. The glenohumeral joint connecting the scapula to the humerus is the point of articulation for shoulder abduction.Ī healthy shoulder allows for a 150-degree range of motion during shoulder abduction this range of motion will be significantly reduced if the primary musculoskeletal support of the shoulder, the rotator cuff, is damaged. passively externally rotate and abduct the patients arm while having the patient turn their neck away from the tested extremity. Shoulder abduction is a movement of the arm away from the body and should not be confused with shoulder adduction, which involves movement toward the center of the body.ĭuring shoulder abduction, the middle deltoid and supraspinatus muscles of the shoulder operate to lift the arm away from the side of the body. The abduction of the arm begins with the arm in a position parallel to the. Provide support, stabilization and abduction control to injured or postoperative shoulder and arm. In the Jobe position, the supraspinatus abduction moment arm is. ![]() ![]() In the case of arm abduction, it is the movement of the arms away from the body within the plane of the torso (sagittal plane). has a greater mechanical advantage vs the other tested muscles in the neutral arm position. Intrinsic muscles of shoulder girdle: (1) Pectoralis major I (clavicular) (2) deltoid: Severe: 40: 30 Moderately Severe: 30: 20 Moderate: 20: 20 Slight: 0: 0 5304 Group IV. WorkplaceTesting Explains Shoulder Abduction In general terms, abduction, in the anatomical sense, is classified as the motion of a limb or appendage away from the midline of the body. Function: Elevation and abduction of arm to level of shoulder act with 1 and 2 of Group II in forward and backward swing of arm. ![]()
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