With the patient's shoulder relaxed, place your fingers on the superiolateral part of the axillary border of the scapula, lateral to the infraspinatus muscle belly and inferior to the tendon of the infraspinatus tendon. Position the patientís arm in neutral with the elbow flexed to 90∞ and elbow tucked to the side of the patientís body. Ask the patient to move his/her hand across his/her body and back, which medially and laterally rotates the shoulder joint, respectively. Palpate the muscle bulge during the movement of lateral rotation. With unclear muscle activity, provide slightly more resistance by having the patient hold or push against a push on the forearm in the direction of shoulder medial rotation to resist a shoulder lateral rotation effort.