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Oblique picture of right ulnar nerve release demonstrating medial translation of the nerve. Purple dot near the tip of the ruler is the most medial aspect of the medial epicondyle. Ulnar nerve is just below the ruler and shows it breaking the sagittal plane of the most medial aspect of the medial epicondyle, that is, the nerve is subluxing medial to the epicondyle. As the subluxation is <2 mm, this is Grade 1 instability.
