A wider range of abnormalities can be observed on dynamic sonography in the presence of subacromial impingement. Using dynamic sonography, described pooling of fluid lateral to the subdeltoid bursa as signs of early-stage subacromial impingement. Dynamic sonography of the elbow was used to aid in the accurate diagnosis of, and differentiation between, ulnar nerve dislocation and snapping of the medial triceps muscle. Causes of medial elbow pain and/or ulnar neuropathy are many, and they include ulnar nerve compression within the cubital tunnel, ulnar nerve subluxation or dislocation, and snapping triceps syndrome. The dynamic imaging allows continual visualization of the ulnar nerve and triceps muscle throughout active elbow flexion and extension. Knowledge and accurate diagnosis of ulnar nerve and/or medial triceps muscle dislocation as causes for medial elbow snapping are important so that proper surgical treatment may be prescribed. This dynamic evaluation with sonography has more advantages, as opposed to static evaluation with routine MR imaging. In addition, any palpable snap can be directly correlated with the sonographic findings to confirm the diagnosis. This is also important because not all cases of ulnar nerve and medial triceps muscle dislocation are symptomatic.