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Cubital Tunnel Syndrome

All Neurological Surgery physicians at the University of Florida treat patients with Cubital Tunnel Syndrome.


cubital tunnel syndrome diagramAbout Cubital Tunnel Syndrome

The hand has several nerves that supply sensation and movement. The two main nerves of the hand are the median and ulnar nerves. Nerve roots from the spinal cord come together in the axilla to make the brachial plexus, which then splits into many nerves, one of which is the ulnar nerve. The ulnar nerve innervates muscles in the forearm and hand, and gives sensation to parts of the hand. As the ulnar nerve travels to the hand from the arm, it passes through the elbow. The ulnar nerve rests in the condylar groove of the cubital tunnel (the elbow joint) and can be compressed for several reasons.

It is subject to external compression and repetitive minor impacts. The nerve can be compressed from scarring of the ligament over the cubital tunnel. Flexion of the elbow stretches the nerve, which also increases pressure. If the nerve gets entrapped in this area, it can cause numbness and tingling in the palm, ring finger, and small finger. This is called an cubital tunnel syndrome syndrome, or ulnar neuropathy.


dorsal ulnar location of initial symptoms along the ring and little fingerSymptoms

Early symptoms include intermittent tingling and pins and needles sensation along the ring and little finger and discomfort along the medial aspect of the forearm. As the disease process progresses patients may complain of pain around the elbow that is exacerbated by any kind of contact. Later symptoms include numbness and weakness of the hand muscles. There often is significant wasting of the intrinsic hand muscles. The last two fingers can assume a classic claw hand posture from ulnar neuropathy.


Diagnosis

Patients may complain of tingling or “pins and needles” in their fingers and hand, most significantly in the middle, ring, and little finger. Sensory loss and a burning sensation are commonly reported. Pain may radiate up into the arm.

Physical exam findings include electric shocks or tingling sensation in the ring and little fingers by tapping the nerve at the cubital tunnel (elbow). Sensory exam may show diminished sensation to pinprick and light touch along the little and ring fingers. Weakness of spreading the fingers apart may also appear later in the disease process. Patients may have trouble holding on to a sheet of paper with their thumb and index finger (Froment’s sign).

Electromyography (EMG) and nerve conduction studies (NCS) are done to confirm electrical changes in the ulnar nerve indicative of significant compression.


Treatment

elbow splintConservative management involves using an elbow splint at night, using elbow pads for “elbow resters” and modification of work-related repetitive elbow flexion. Over-the-counter pain relievers can also provide temporary relief. Many people will have significant relief of their symptoms with conservative treatment.

cubital nerve surgery sitePatients who fail conservative therapy or having severe symptoms with neurological deficit may undergo surgery to relieve the pressure on the nerve.

Ulnar decompression involves making a 3-4 inch incision over the elbow joint and incising one of the ligaments of the tunnel. This opens the tunnel and reduces the pressure on the nerve. This is performed under local anesthesia and is usually an outpatient procedure. No immobilization is necessary after the surgery and patients recover quickly.