Subacromial impingement due to RC calcification

Figure 1. Lateral view, frontal plane, resting position.

Calcific deposit within the supraspinatus tendon of the rotator cuff, located in the subacromial space beneath the acromion. In the resting position, no significant mechanical conflict is evident.

Figure 2. Lateral view, frontal plane, abduction.

Dynamic abduction demonstrates subacromial impingement caused by the calcific deposit within the supraspinatus tendon. During elevation of the arm, the calcification approaches and impinges beneath the acromion, resulting in mechanical compression of the supraspinatus tendon within the narrowed subacromial space.