They diagnosed ulnar palsy, or “claw hand”, by analyzing the depiction of his right hand in two artworks. It had been suggested that Leonardo's hand impairment was caused by a stroke.
Figures 8A-8D show a patient with paralysis of the ulnar nerve and claw-finger deformity. One year after surgery, the patient had full extension and flexion of the fingers and sensory recovery to S3+.
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