1/30/2024 0 Comments Abduction of arm![]() ![]() It is hence produced by co-ordination of all the muscles that produce these individual movements but also relies on other joints of the pectoral girdle such and the acromioclavicular joint and scapulothoracic joint. However, as the arm is abducted, this increases towards 70°.Ĭircumduction is the orderly combination of shoulder flexion, abduction, extension and abduction (or the reverse) to trace a cone with the arm. Shoulder abduction involves lifting the arms out to the side (as with a lateral dumbbell raise), while shoulder adduction means lowering the arms back to the side (as with a banded lateral pull-down exercise). When the arm is adducted, medial rotation of 40-55° is possible. Arm abduction is the movement of your arms out and away from your body’s center, and arm adduction is moving them back toward your center. As with medial (internal) rotation, the degree of rotation is dependant on the degree of abduction. As the arm is abducted this increases towards 95°.Įxternal (lateral) rotation describes external rotation of the humeral around its longitudinal axis. In adduction internal rotation can be up to 70°. The degree of rotation is dependant on the degree of abduction at the shoulder. Compensation for lost arm strength if you have an injury, such as a rotator cuff tear. Internal (medial) rotation represents the movement of the humerus when an arm flexed to 90° at the elbow is rotated around the longitudinal plane of the humerus such that the hand moves towards the midline of the body. Arm abduction, which means raising your arm out to the side of your body. Is represents raising the arm and isolated flexion can achieve approximately 150-170° of movement.Īrm extension represents the opposite movement to arm flexion and can only achieve about 40° of movement in most individuals.Īrm abduction represents movement of the arm away from the midline of the body and, in most cases isolate abduction can be achieved to 160-180°.Īrm adduction represents movement of the arm towards the midline and most individuals can manage 40° of isolated adduction. Arm flexionĪrm flexion represents rotation in the anatomic plane such that the distal humerus moves ventrally. The glenohumeral joint is highly mobile resulting in a wide range of movements of the arm.
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