Ultrasound (US) image of a dynamic subacromial impingement test. Fluid can be seen being milked from under the acromion into the subacromial-subdeltoid bursa during shoulder abduction.
A: acromion; D: deltoid muscle; Asterisk: fluid within the subacromial-subdeltoid bursa; SS: supraspinatus; MED: medial; GT: greater tuberosity of the humerus bone. Left: medial; Right: lateral; Bottom of screen: deep; Top of screen: superficial.
Courtesy of Jonathan Finnoff, DO. Used with permission of Mayo Foundation for Medical Education and Research. All rights reserved.
