Deltoid Anterior And Posterior Sitting

ANTERIOR DELTOID

Patient: Sitting.

Fixation: If scapular fixation muscles are weak, the scapula must be stabilized by the examiner. As pressure is applied on the arm, counterpressure is applied posteriorly to the shoulder girdle.

Test: Shoulder abduction in slight flexion, with the humerus in slight lateral rotation. In the erect sitting position, it is necessary to place the humerus in slight lateral rotation to increase the effect of gravity on the anterior fibers. (The anatomical action of the anterior deltoid, which entails slight medial rotation, is part of the test of the anterior deltoid in the supine position. See facing page.)

Pressure: Against the anteromedial surface of the arm, in the direction of adduction and slight extension.

POSTERIOR DELTOID

Patient: Sitting.

Fixation: If scapular fixation muscles are weak, the scapula must be stabilized by the examiner. As pressure is applied on the arm, counterpressure is applied anteriorly on the shoulder girdle.

Test: Shoulder abduction in slight extension, with the humerus in slight medial rotation. In the erect sitting position, it is necessary to place the humerus in slight medial rotation to have the posterior fibers in an anti-gravity position. (The anatomical action of the posterior deltoid, which entails slight lateral rotation, is pari of the test of the posterior deltoid in the prone position. See facing page.)

Pressure: Against the posterolateral surface of the arm, above the elbow, in the direction of adduction and slight flexion.

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