Ulnar nerve entrapment

Ulnar nerve entrapment is a condition where pressure on the ulnar nerve as it passes through the cubital tunnel causes nerve dysfunction (neuropathy). The symptoms of neuropathy are paresthesia (tingling) and numbness (loss of sensibility) primarily affecting the little finger and ring finger of the hand. Ulnar neuropathy can progress to weakness and atrophy of the muscles in the hand (interossei and small and ring finger lumbricals). Symptoms can be alleviated by attempts to keep the elbow from flexing while sleeping, such as sticking one's arm in the pillow case, so the pillow restricts flexion.