Cubital Tunnel Syndrome and Ulnar Nerve Entrapment
The ulnar nerve passes behind the inner side of the elbow through a narrow passage with bone on one side and a fascial roof on the other, and it is the reason a knock there produces the sensation people call hitting the funny bone. When that nerve is compressed persistently rather than momentarily, the result is cubital tunnel syndrome, the second most common nerve compression in the body after carpal tunnel.
Steven Struhl, MD is board certified in orthopedic surgery and holds separate board certification in sports medicine and arthroscopic surgery, serves on the faculty of NYU School of Medicine, and has practiced in New York since 1991. Nerve compression is one of the few conditions where waiting has a genuine cost, because prolonged compression produces changes in the muscle that do not fully reverse.
Cubital Tunnel Syndrome Symptoms
- Numbness in the Ring and Little Fingers: the hallmark, since those are the fingers the ulnar nerve supplies.
- Tingling That Wakes You: worse at night, because most people sleep with the elbow bent.
- Symptoms With the Elbow Bent: driving, holding a phone, or leaning on an armrest.
- Aching on the Inside of the Elbow: which frequently gets mistaken for golfer’s elbow.
- Weak Grip and Pinch: particularly difficulty holding a key or pinching a page.
- Clumsiness: dropping things, difficulty with buttons, and crossing the fingers becoming hard.
- Visible Muscle Wasting: hollowing between the thumb and index finger, which is a late sign and a serious one.
Symptoms usually begin intermittently and become constant over months. Muscle wasting means the compression has been present long enough to cause damage, and recovery after surgery at that stage is incomplete.
Why the Ulnar Nerve Gets Compressed
Bending the elbow stretches the nerve and narrows the tunnel it runs through, which is why position matters so much in this condition.
- Prolonged Elbow Flexion: sleeping with the arm curled, phone use, or a job held in that position.
- Leaning on the Elbow: direct pressure on the nerve where it is least protected.
- Repetitive Bending: occupational or athletic.
- Prior Elbow Fracture or Dislocation: changing the anatomy of the tunnel.
- Elbow Arthritis and Bone Spurs: narrowing the space directly.
- Nerve Subluxation: in some people the nerve slips forward over the bony prominence with bending, irritating it repeatedly.
- Ganglion or Swelling: occupying space within the tunnel.
Diagnosis
Examination reproduces the symptoms by holding the elbow fully bent for a minute, taps over the nerve to provoke tingling, and checks strength in the specific muscles the nerve supplies, along with sensation in the ring and little fingers. Whether the nerve subluxes with elbow motion is checked directly, since it changes the surgical plan. Nerve conduction studies and electromyography measure how much the nerve is slowed and whether the muscle has been affected, and they help distinguish elbow compression from a neck problem producing similar symptoms. Radiographs assess for arthritis, spurs, and old fracture.
Non Surgical Treatment
Mild and intermittent symptoms frequently respond to changing what the elbow does, and this is the right first step in most patients.
- Night Splinting: holding the elbow relatively straight overnight, which is the single most effective non surgical measure.
- Activity Modification: avoiding sustained bending and leaning on the elbow.
- Elbow Padding: protecting the nerve during work.
- Nerve Gliding Exercises: encouraging the nerve to move freely within its tunnel.
- Anti Inflammatory Medication: for associated aching.
Corticosteroid injection is generally avoided in the cubital tunnel, unlike the carpal tunnel, because the evidence does not support it and the nerve sits superficially.
Cubital Tunnel Surgery
Surgery is indicated for symptoms that persist despite non surgical treatment, for constant numbness, and for any weakness or muscle wasting, where it should not be delayed. Dr. Struhl performs cubital tunnel surgery as an outpatient procedure.
- In Situ Decompression: releasing the fascial roof of the tunnel to give the nerve more room, leaving it in place. The smaller procedure, appropriate when the nerve is stable.
- Anterior Transposition: moving the nerve to the front of the elbow so it is no longer stretched with bending. Used when the nerve subluxes, when the anatomy has been altered by prior injury, and in revision cases.
- Medial Epicondylectomy: removing part of the bony prominence, used selectively.
Recovery After Cubital Tunnel Release
- Weeks One to Two: a soft dressing or light splint, with hand and finger motion encouraged immediately.
- Weeks Two to Six: elbow motion restored, light activity resumed.
- Weeks Six to Twelve: strengthening progressed and return to most work.
- Months Three to Twelve: nerve recovery continuing, which is the slow part.
Being honest about the timeline helps. Pain and night symptoms usually improve quickly. Numbness improves over months as the nerve recovers, and nerves regenerate slowly. Where muscle wasting was present before surgery, some deficit frequently remains permanently, which is the argument for treating this before it reaches that stage.
Schedule an Ulnar Nerve Consultation in New York City
Numbness in the ring and little fingers that has become constant, or any weakness in the hand, should be evaluated promptly rather than watched, because the recovery available depends on how long the nerve has been compressed. Dr. Struhl evaluates elbow conditions at his Manhattan and Westchester offices. Contact our orthopedic practice to schedule an appointment.
