Ulnar Compression

The ulnar nerve extends down the arm, across the elbow and into the hand. It controls many small muscles in the hand and provides sensation to the ring and little fingers. When you hit your “funny bone,” you actually bump the ulnar nerve. If the nerve becomes inflamed from a more severe injury, such as an elbow fracture or dislocation, it can become trapped between bones and other tissues in the cubital tunnel at the inside of the elbow. Inflammation can also occur if the ulnar nerve undergoes prolonged pressure. Every time the elbow bends, pressure is put on the ulnar nerve. Over time, the nerve may lose its ability to conduct signals from the brain. The muscles of the hand may gradually weaken. Diabetics, alcoholics and people with arthritis are at increased risk for the condition.

Symptoms of ulnar nerve entrapment include numbness in the ring and little fingers, particularly at night, numbness in the hand, particularly when the elbow is bent, muscle weakness, decreased coordination, or tenderness on the inside of the elbow. Diagnosis may involve an electrical nerve conduction test or X-rays or other imaging procedures.

Treatment may include wearing a splint at night, keeping the elbow as straight as possible, medications to treat inflammation and pain, or surgery, which may involve moving the nerve to the front of the elbow.