Examination of the acromioclavicular joint is best carried out bilaterally from behind the patient. The clavicle is palpated laterally along its lateral third until the mass of the joint is felt as a disruption of the smooth contour. Often, it is best appreciated by palpating medially from the acromion as the lateral tip of the clavicle tends to slightly override the acromion.
To further aid palpation, ask the patient to flex and extend their arms. Scapulothoracic motion is transmitted via the joint and it may be felt to move during this procedure.
Pathology such as osteoarthritis may produce audible and palpable crepitation in the joint. Alternatively, its outline may be accentuated by dislocation of the lateral end of the clavicle.
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