You know how much that hurts? Make it hurt 100 times more. Apparently, ulnar nerve entrapment occurs when the ulnar nerve in the arm becomes irritated, in KML’s case, compressed by trauma.

Patrick Radecki, Variability in the Median and Ulnar Nerve Latencies: Implications for Diagnosing Entrapment, Journal of Occupational and Environmental Medicine, Vol. 37, No. 11 (November 1995), pp.