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Carpal Tunnel Syndrome Health Center

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Injection of Steroid Improves Symptoms of Carpal Tunnel Syndrome for at Least a Year


WebMD Health News

Oct. 15, 1999 (New York) -- Injecting steroid drugs near -- but not in -- the carpal tunnel of the wrist can lead to a long-term improvement of symptoms in people with carpal tunnel syndrome, according to Dutch researchers. They conclude that the therapy should be considered as an option before surgery in people with the repetitive motion injury. Among patients with carpal tunnel syndrome who received a single injection of steroids, 77% had improvement in symptoms at one month and 50% continued to benefit one year later. The report is published in a recent issue of the British Medical Journal.

Injection of the steroid drug methylprednisolone into the carpal tunnel is one recommended treatment for carpal tunnel syndrome. However, this method is associated with complications such as infection and nerve damage. In some studies, this method also has been associated with a short duration of benefit. The authors of the new study say injecting the drug near the carpal tunnel reduces the risk of complications and is technically easier to perform than injection into the narrow carpal tunnel itself.

Carpal tunnel syndrome is caused by compression of the median nerve that runs through the carpal tunnel in the wrist. People with carpal tunnel syndrome typically have pain, weakness, and numbness or tingling in the hand and arm. The syndrome is generally thought to be caused by repetitive motion such as typing, operating equipment, or any type of work that requires chronic repetitive motion of the fingers, wrist, and arm.

J.W.H.H. Dammers, MD, and colleagues from the Academic Medical Center at the University of Amsterdam studied 60 patients who each had a three-month or longer history of carpal tunnel syndrome. Patients were divided into two groups: control and intervention. People in the control group received an injection of the anesthetic lidocaine and people in the invention group received lidocaine plus methylprednisolone. The injections were given in the forearm about 4 cm from the wrist crease. Following the injection, the fluid was gently massaged toward the carpal tunnel area.

At one month, 77% of patients in the intervention group had few or no symptoms, compared with only 20% of patients in the control group. Twenty-eight patients in the control group were subsequently offered the steroid injection and of these, 86% responded to treatment. However, half of those who responded to treatment did eventually require carpal tunnel surgery.

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