Ultrasound
The static image with complete elbow extension shows the normal position of the ulnar nerve and the triceps muscle. With 90-degree elbow flexion, both nerve, and muscle are located closer to the humeral medial epicondyle. An image with complete elbow flexion shows dislocated nerve and the muscle lying anterior to the medial epicondyle.
1st cine-loop is during gradual elbow flexion. Ulnar nerve dislocation is followed by triceps muscle dislocation over the humeral medial epicondyle.
2nd cine-loop is during gradual elbow extension. Triceps muscle relocation is followed by ulnar nerve relocation.