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Abduction is a movement of a body part away from the median plane of the body (think someone raising their leg or arm away from their side). Adduction is just the opposite, meaning movement of a body part toward the median plane of the body.
As with medial (internal) rotation, the degree of rotation is dependant on the degree of abduction. When the arm is adducted, medial rotation of 40-55Â° is possible. However, as the arm is abducted, this increases towards 70Â°. infraspinatus; teres minor; deltoid (posterior fibres)