You've Heard of Carpal Tunnel. Cubital Tunnel Is Less Known — and Just as Important to Treat Before It Becomes Irreversible.
Most people have heard of carpal tunnel syndrome — the pinched nerve at the wrist that causes numbness and tingling in the hand. Far fewer have heard of cubital tunnel syndrome, the second most common nerve compression in the upper extremity. But for the millions of people who spend hours a day typing, resting their elbows on hard surfaces, or bending their elbows for prolonged periods, cubital tunnel syndrome is the explanation for symptoms they may have been living with for years without a name.
Cubital tunnel syndrome is compression of the ulnar nerve — the nerve that runs behind the bony prominence on the inside of the elbow that most people call the funny bone. When this nerve is compressed or irritated, it causes numbness and tingling in the pinky finger and the outer half of the ring finger, weakness in the hand, and in advanced stages, irreversible muscle wasting that no surgery can fully reverse.
The key word is early. Caught early, cubital tunnel syndrome responds well to conservative treatment and most patients never need surgery. In advanced stages, the window for full recovery narrows — and in some cases closes. If you have been living with pinky and ring finger numbness, hand weakness, or elbow pain that radiates into the forearm, do not wait.
Call (310) 746-5918 to schedule a consultation. Virtual consultations are available.
Understanding the Problem: The Ulnar Nerve and the Cubital Tunnel
The ulnar nerve travels from the neck down the arm and passes through a narrow passageway behind the medial epicondyle — the bony prominence on the inside of the elbow commonly known as the funny bone. This passageway is the cubital tunnel, formed by bone, ligament, and muscle. When the structures of the cubital tunnel thicken, when the elbow is held in prolonged flexion, or when the nerve is subjected to repetitive stretching, the nerve becomes compressed and its function deteriorates.
Unlike most nerves in the body, the ulnar nerve is particularly vulnerable at the elbow because it must stretch significantly every time the elbow bends. In patients who spend long hours typing, talking on the phone with the elbow bent, or sleeping with the elbow flexed, this repetitive tension accumulates over time — gradually damaging the nerve's ability to conduct signals to the hand.
The ulnar nerve controls sensation in the pinky finger and the outer half of the ring finger, and provides motor function to many of the small intrinsic muscles of the hand — the muscles responsible for grip strength, finger coordination, and the fine motor control required for typing, playing an instrument, or performing detailed work with the hands.
Symptoms and Stages
Cubital tunnel syndrome progresses through stages, and the stage at which treatment is initiated largely determines the outcome.
In early stages, patients notice intermittent numbness and tingling in the pinky and ring fingers — often worse when the elbow is bent, during phone calls, or upon waking in the morning. Hand function is preserved and symptoms resolve with position changes. In intermediate stages, symptoms become more persistent. Numbness may be present throughout the day, grip strength begins to decline, and patients notice difficulty with fine motor tasks. In advanced stages, muscle wasting becomes visible. The small muscles between the bones of the hand — the interossei — begin to atrophy, creating visible hollowing between the fingers and a characteristic clawing deformity of the ring and pinky fingers. These changes can be irreversible. Surgery at this stage can halt progression and improve function, but full recovery of muscle mass is not guaranteed.
This is why the EMG and nerve conduction study — the electrical test that measures how well the ulnar nerve is conducting signals — is the critical first step in every cubital tunnel evaluation. It confirms the diagnosis, localizes the compression, and determines the severity of nerve damage. It guides the treatment decision and sets realistic expectations for recovery.
Non-Operative Treatment
For patients with mild to moderate cubital tunnel syndrome — particularly those diagnosed early — conservative treatment is the appropriate first step and most patients do well without surgery.
Non-operative management includes activity modification to avoid prolonged elbow flexion, night splinting to keep the elbow in a straightened position during sleep, ergonomic adjustments to the workstation, anti-inflammatory medications, and a targeted physical therapy program focused on nerve gliding and elbow flexibility. Many patients experience significant improvement with these measures alone, particularly when the nerve damage has not yet progressed to the intermediate or advanced stage.
When Surgery Is Needed: Three Approaches — and Why the Choice Matters
When conservative treatment fails, or when a patient presents with intermediate to advanced nerve compression, surgery is indicated. There are three primary surgical options for cubital tunnel syndrome, and the right choice depends on the individual patient's anatomy, the severity of compression, and whether any associated conditions are present.
Ulnar Nerve Transposition
Transposition moves the ulnar nerve from its position behind the medial epicondyle to the front of it — eliminating the stretch and compression it experiences in its original location. Once moved, the nerve can be placed in one of two positions: subcutaneous transposition places the nerve just beneath the skin, on top of the muscle. This is a simpler procedure but leaves the nerve in a relatively superficial position. Submuscular transposition places the nerve beneath the flexor muscle group, providing a better vascular bed and more protection — but requiring a more involved dissection and a longer rehabilitation. Both have appropriate indications, and the choice between them depends on the individual patient's anatomy, body habitus, and the severity of the compression.
Ulnar Nerve Decompression In Situ
Decompression releases the roof of the cubital tunnel — the ligamentous structure that forms the top of the passageway — without moving the nerve from its anatomic position. By cutting this structure, the pressure on the nerve is relieved and it is allowed to function without compression. This is a less invasive procedure appropriate for patients with mild to moderate compression in whom the nerve does not sublux — slide out of position — during elbow flexion. Recovery is faster than transposition and the results in appropriately selected patients are excellent.
Partial Medial Epicondylectomy
Partial medial epicondylectomy removes a portion of the bony medial epicondyle — the funny bone itself — to decompress the nerve and eliminate the bony prominence around which it curves. Dr. Mirzayan reserves this option specifically for patients who have both cubital tunnel syndrome and medial epicondylitis — golfer's elbow — simultaneously. In that setting, removing the medial epicondyle addresses both problems in a single procedure: it decompresses the nerve and eliminates the tendinous insertion that is the source of golfer's elbow pain. For the right patient, it is an elegant solution that avoids two separate surgeries.
What Dr. Mirzayan Does Differently: Amnion Wrapping to Prevent Recurrence
Here is a problem that most patients are never told about before cubital tunnel surgery: approximately 20% of patients who undergo ulnar nerve surgery experience initial improvement followed by a return of symptoms months or years later. The reason is scar tissue. After surgery, the body's natural healing response deposits new scar tissue around the nerve. As that scar matures and contracts, it compresses the nerve again — recreating the same problem the surgery was designed to solve.
This is not a rare complication. It is a well-recognized failure mode of cubital tunnel surgery, and it is the reason many patients require revision procedures.
Dr. Mirzayan addresses this problem directly by wrapping the ulnar nerve with amnion — a biological membrane derived from the innermost layer of the placenta — at the time of the original surgery. Amnion has well-documented anti-inflammatory, anti-fibrotic, and anti-adhesion properties. By creating a biological barrier around the nerve, it inhibits the formation of new scar tissue during the healing process — protecting the nerve from the very mechanism that causes recurrence.
Dr. Mirzayan demonstrated this technique in a surgical video produced by Arthrex: Using Arthrex Amnion Matrix to Prevent Adhesion in Ulnar Nerve Transposition
The Published Evidence
The clinical proof comes from a Level 3 comparative study showing a significant reduction in recurrence rates in patients who received amnion wrapping compared to those who did not: Amnion Wrapping for Ulnar Nerve Transposition — Comparative Study
For surgeons and patients who want to understand the broader science behind amnion application in orthopedic surgery: Amnion in Orthopedics — Clinical Primer
A series of three patients with second-look evaluations after amnion application — providing direct visual confirmation of reduced scar tissue formation around the nerve: Second-Look Series After Amnion Application
This is not an experimental add-on. It is a biologically sound, published, evidence-backed technique that directly addresses the most common reason cubital tunnel surgery fails — and it is available to Dr. Mirzayan's patients as a standard part of his surgical approach.
What to Expect: Diagnosis, Surgery, and Recovery
Diagnosis
Every cubital tunnel evaluation begins with a detailed history and physical examination. Dr. Mirzayan will assess sensation in the pinky and ring fingers, grip and pinch strength, the presence of intrinsic muscle wasting, and whether the nerve subluxes during elbow flexion. An EMG and nerve conduction study is obtained in every case to confirm the diagnosis, localize the compression, and grade the severity of nerve damage. This test is essential — it guides the surgical decision and sets realistic expectations for recovery.
Surgery
Cubital tunnel surgery is performed as an outpatient procedure under general anesthesia or regional nerve block. The procedure takes approximately 45 to 60 minutes depending on the technique selected. Amnion wrapping is incorporated into the procedure at the time of nerve decompression or transposition. Patients go home the same day.
Recovery
Recovery varies depending on the procedure performed. After decompression in situ, most patients are back to light activity within one to two weeks. After transposition, the arm is protected for a longer period and physical therapy is initiated to restore elbow motion and strength. Nerve recovery follows its own timeline — sensation typically improves before motor function, and full recovery can take months depending on the severity and duration of compression prior to surgery. Dr. Mirzayan will give you a personalized recovery timeline based on your specific nerve study results and the procedure performed.
Coming from Las Vegas, Phoenix, or Out of State?
Cubital tunnel syndrome is a condition where surgical technique and the prevention of recurrence matter enormously. The 20% recurrence rate from scar tissue formation is not an inevitable outcome — it is a problem that can be addressed at the time of the original surgery, before it ever becomes an issue. For patients who want the best possible chance of a durable result from a single procedure, Dr. Mirzayan's amnion wrapping technique offers something that most cubital tunnel surgeries do not.
Dr. Mirzayan regularly treats patients from Las Vegas, Henderson, Phoenix, Scottsdale, and across the country. If you carry a commercial insurance plan — Blue Cross Blue Shield PPO, Aetna, Cigna, United Healthcare, or a self-funded employer plan — you likely have out-of-network benefits that cover a substantial portion of the cost of surgery. His office will verify your coverage before you commit to anything.
Virtual consultations are available. You can submit your EMG results and imaging in advance, meet Dr. Mirzayan on video, and determine whether making the trip to Los Angeles is the right next step.
Call (310) 746-5918 or contact us online to schedule your consultation.
Frequently Asked Questions
What is cubital tunnel syndrome?
Cubital tunnel syndrome is compression of the ulnar nerve at the elbow — the nerve that passes behind the bony prominence on the inside of the elbow known as the funny bone. It causes numbness and tingling in the pinky finger and outer half of the ring finger, hand weakness, and in advanced cases, irreversible muscle wasting in the hand. It is the second most common nerve compression syndrome in the upper extremity after carpal tunnel syndrome.
How is cubital tunnel syndrome different from carpal tunnel syndrome?
Both are nerve compression syndromes but they involve different nerves at different locations. Carpal tunnel syndrome involves the median nerve at the wrist and causes numbness in the thumb, index, and middle fingers. Cubital tunnel syndrome involves the ulnar nerve at the elbow and causes numbness in the pinky and ring fingers. The treatment approaches are also different. Dr. Mirzayan treats both conditions.
Do I need surgery for cubital tunnel syndrome?
Not necessarily — and not immediately. Mild to moderate cubital tunnel syndrome diagnosed early responds well to conservative treatment including activity modification, night splinting, and physical therapy. Surgery is reserved for patients who fail conservative management or who present with intermediate to advanced nerve compression on EMG testing. The earlier treatment begins, the more likely it is that surgery can be avoided.
What happens if cubital tunnel syndrome goes untreated?
The nerve damage progresses. In advanced stages, the intrinsic muscles of the hand begin to atrophy — a change that can be permanent. Visible hollowing between the fingers, clawing of the ring and pinky fingers, and permanent loss of grip and pinch strength can result. Surgery at this stage can halt progression but cannot guarantee full recovery of muscle function. Early evaluation and treatment is essential.
Why do some patients have recurrence after cubital tunnel surgery?
Approximately 20% of patients who undergo cubital tunnel surgery experience initial improvement followed by a return of symptoms. The cause is scar tissue — the body's natural healing response deposits new collagen around the nerve after surgery, and as that scar matures and contracts, it compresses the nerve again. Dr. Mirzayan addresses this directly by wrapping the ulnar nerve with amnion at the time of surgery — a biological membrane with documented anti-fibrotic and anti-adhesion properties that inhibits new scar tissue formation and protects against recurrence.
What is amnion and is it safe?
Amnion is the innermost membrane of the placenta. It has been used in medicine for over a century and has well-documented biological properties including anti-inflammatory, anti-fibrotic, and anti-adhesion effects. It is processed and sterilized for surgical use and has an excellent safety record. Its application in nerve surgery is supported by published clinical and basic science evidence. Dr. Mirzayan has published on its use in ulnar nerve surgery specifically and incorporates it as a standard component of his cubital tunnel surgical technique.
What is the difference between transposition and decompression?
Decompression releases the roof of the cubital tunnel to relieve pressure on the nerve without moving it from its anatomic position. It is appropriate for patients with mild to moderate compression whose nerve does not sublux during elbow motion. Transposition moves the nerve from behind the medial epicondyle to the front of it, eliminating the stretch and compression it experiences in its original location. It is used for patients with more significant compression, nerve subluxation, or failed prior decompression. Both procedures are performed with amnion wrapping in Dr. Mirzayan's hands.
Do you offer virtual consultations for out-of-state patients?
Yes. Dr. Mirzayan offers virtual consultations for patients traveling from out of state. You can submit your EMG and nerve conduction study results in advance, meet Dr. Mirzayan on video, and determine whether making the trip to Los Angeles is the right next step. Call (310) 746-5918 to schedule.
Does being out-of-network mean I will pay full price out of pocket?
Not necessarily. Many patients with commercial insurance — especially PPO plans and self-funded employer plans — have strong out-of-network benefits. Dr. Mirzayan's office will verify your coverage before your consultation so you have a clear picture of what to expect before making any decisions.
About Dr. Raffy Mirzayan
Dr. Raffy Mirzayan, MD is a double-board certified orthopedic sports medicine surgeon with 25 years of experience treating nerve conditions of the upper extremity, including cubital tunnel syndrome at every stage of severity. He is one of a small number of surgeons who incorporates amnion wrapping as a standard component of ulnar nerve surgery — a technique supported by published peer-reviewed evidence and demonstrated in a surgical video produced by Arthrex. With 88 peer-reviewed publications, proficiency in the full spectrum of cubital tunnel surgical options, and a specific focus on preventing the scar tissue recurrence that causes one in five cubital tunnel surgeries to fail, Dr. Mirzayan brings both the expertise and the innovation to give his patients the best possible chance of a durable, lasting result. He practices at DOCS Health in Los Angeles, serves as a Clinical Professor of Orthopaedic Surgery at USC, and welcomes patients from across the United States, including Las Vegas, Phoenix, and Scottsdale, for virtual consultations and in-person care.
DOCS Health | 8436 W 3rd St #800, Los Angeles, CA 90048 | (310) 746-5918 | raffymirzayan.com
