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A prospective study to assess the outcome of steroid injections and wrist splinting for the treatment of carpal tunnel syndrome.

Surgery is the definitive treatment for carpal tunnel syndrome. Conservative treatments, such as wrist splinting and steroid injections, are also effective for the relief of carpal tunnel symptoms, but their use remains controversial because they only offer long-term relief in a minority of patients. A prospective study was performed to assess the role of steroid injections combined with wrist splinting for the management of carpal tunnel syndrome. A total of 73 patients with 99 affected hands were studied. Patients presenting with known medical causes or muscle wasting were excluded. Diagnosis was made clinically and electrodiagnostic studies were performed only when equivocal clinical signs were present. Each patient received up to three betamethasone injections into the carpal tunnel and wore a neutral-position wrist splint continuously for 9 weeks. After that period, symptomatic patients received an open carpal tunnel release, and those who remained asymptomatic were followed up regularly for at least 1 year. Patients who relapsed were scheduled for surgery. At a minimum follow-up of 1 year, seven patients (9.6 percent) with 10 affected hands (10.1 percent) remained asymptomatic. This group had a significantly shorter duration of symptoms (2.9 months versus 8.35 months; p = 0.039, Mann-Whitney test) and significantly less sensory change (40 percent versus 72 percent; p = 0.048, Fisher's exact test) at presentation when compared with the group who had surgery. It is concluded that steroid injections and wrist splinting are effective for relief of carpal tunnel syndrome symptoms but have a long-term effect in only 10 percent of patients. Symptom duration of less than 3 months and absence of sensory impairment at presentation were predictive of a lasting response to conservative treatment. It is suggested that selected patients (i.e., with no thenar wasting or obvious underlying cause) presenting with mild to moderate carpal tunnel syndrome receive either a single steroid injection or wear a wrist splint for 3 weeks. This will allow identification of the 10 percent of patients who respond well to conservative therapy and do not need surgery.

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