What is carpal tunnel syndrome?
Carpal tunnel syndrome (CTS) is the most common compression neuropathy in the upper extremity. It results from increased pressure on the median nerve at the wrist, within the carpal tunnel. Symptoms such as hand numbness, tingling, weakness, and hand pain can result if the nerve is compressed or “pinched.”
The word “carpus” is derived from the Greek word karpos, which means “wrist.” The carpal tunnel is a passageway in the wrist through which the median nerve and tendons of the hand travel (see picture). The carpal tunnel is a narrow, confined space: the floor of the tunnel is made up by the carpal bones of the wrist, and the roof is created by the transverse carpal ligament. The median nerve is at risk for compression within this tunnel. If there is abnormal swelling, altered wrist anatomy, or injury to this area, the function of the median nerve may be affected.
What causes carpal tunnel syndrome?
In most cases, the cause of CTS is unknown. Thyroid disorders, rheumatoid arthritis, pregnancy, vitamin deficiencies, diabetes, fluid retention, and trauma can be associated with CTS. Women are more commonly affected than men. Repetitive, forceful gripping and heavy use of vibratory tools may increase a person’s risk of CTS. To date, computer use or typing has not been a proven cause of carpal tunnel.
How do I know if I have carpal tunnel syndrome?
Patients with CTS commonly report “numbness” or “tingling” in the fingers. Some patients feel that the fingertips are “asleep” or report “poor circulation” in the hands. Symptoms are often worse at night and people tend to shake their hands for relief. Some patients report increased symptoms while gripping a steering wheel. Hand pain, dropping objects, clumsiness with the hands, or a weak grip are also common complaints. Some people also report pain in the forearm, wrist or fingers. In severe cases, the muscles at the base of the thumb (thenar muscles) can become weak and atrophy, sometimes permanently.
Often the diagnosis can be made on the basis of your symptoms, medical history, and physical examination. An electrodiagnostic study (nerve conduction study and/or electromyogram) can be ordered to confirm the diagnosis. If you ask the question “why is my hand numb?” please call the Raleigh Hand Center at 919-872-3171 to schedule a consultation with a hand specialist to learn more about carpal tunnel syndrome and other possible causes of hand pain and numbness.
What are the treatment options?
Not everyone with carpal tunnel syndrome needs surgery. Fortunately, many people with CTS improve with non-operative treatment. Wearing a wrist brace at night supports the wrist in neutral alignment and takes pressure off the median nerve. Avoiding prolonged wrist flexion and forceful or repetitive gripping may also help. Corticosteroid injections (cortisone shots) provide an anti-inflammatory effect and can be effective in many patients.
Should these measures fail to improve the condition, or if nerve compression is severe, surgery may be recommended by Raleigh Hand Center physicians. A carpal tunnel release (CTR) is performed to decrease pressure on the median nerve. During this procedure, the “roof” of the carpal tunnel (the transverse carpal ligament) is divided. Cutting the transverse carpal ligament increases the size of the carpal tunnel and provides more room for the median nerve.
The length and type of incision varies among surgeons; however, the common goal is to reduce pressure on the median nerve. The length of incision used for CTR has decreased in size since the procedure was invented decades ago due to advancement in surgical techniques. Open CTR and endoscopic CTR are two surgical options. The recommended procedure will be discussed with you in the clinic.
What is the recovery from surgery?
The surgery is performed as an outpatient under local anesthesia. Oral or intravenous sedation medication may also be used. Patients may use their hands for light activities soon after the surgery. Many people can return to light duty work in a few days. Patients should avoid heavy use of the hand for approximately 3-4 weeks after surgery. As the pain from surgery subsides, normal use of the hand is resumed.
What are the results from carpal tunnel surgery?
Most patients are very satisfied with their outcome after CTR surgery. Many patients report dramatic improvement in their symptoms in just a few days, but others may take longer. Some patients do not have complete relief of symptoms, especially in severe or long-standing cases. Temporary soreness or tenderness in the palm can occur. There is less than 5% recurrence rate after CTR surgery.
What are the complications from surgery?
Complications from carpal tunnel release surgery are uncommon. Possible complications include persistent symptoms, pain, bleeding, infection, stiffness, and damage to the median nerve.
The images are provided by the American Society for Surgery of the Hand.