With elbow extension, the ulnar nerve is anterior to the medial epicondyle of the humerus. Nerve shows normal caliber and echopattern. With elbow flexion, ulnar nerve moves more anteriorly to the medial epicondyle. There is also triceps muscle dislocation anterior to the medial epicondyle of the humerus with the elbow flexion. Snapping could be felt due to triceps dislocation with elbow flexion.
There is no elbow effusion. Common flexure tendon, common extensor tendon, biceps distal tendon, medial ( ulnar ) collateral ligament show normal echopattern.