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Infraspinatus – longitudinal

Patient Positioning

Patient seated on a revolving stool, arm in slight internal rotation. Elbow flexed (90°), palm up (hand can be placed on the thigh).

Probe Positioning

The posterior glenohumeral joint is found by placing the transducer medially from the humeral head on a horizontal plane (long axis of infraspinatus tendon). Check the posterior labrum capsular complex (effusion? calcifications? lesion?) and the infraspinatus and teres minor tendons during external and internal rotation.

Sonogram: Shoulder posterior infraspinatus longitudinal
Sonogram: Shoulder posterior infraspinatus longitudinal

Note: Check the muscle belly for fatty atrophy (increased echogenicity in comparison to the deltoid muscle, visibility of muscle contour, pennate pattern - the architecture of the muscle fibers in relationship to the central tendon).

Increase the depth to visualize the spinoglenoid notch (paralabral cysts - mostly associated with labral lesions).