BMJ Group Medical Reference
Your doctor may suggest that you wear a splint to keep your wrist from bending. This is often suggested as a first treatment.
One study (a randomised controlled trial) found that wearing a splint at night improved symptoms after two weeks.  And the benefits continued for four weeks. A summary of the research (called a systematic review) found that wearing a wrist splint at night can make it easier for you to move your hand or wrist. 
Research shows that splints do not work as well as surgery.  
We don't know whether some splint designs work better than others, or whether wrist splints work better if they are worn all the time, just during the day, or just at night.  You might find it easiest to wear your splints at night and only during the day when you're relaxing, in front of the television, for example.
You can buy wrist splints that support your wrist at a natural, slight angle. Or you can ask your doctor to have a splint custom-made to keep your wrist in a straight, neutral position.
Some people feel pins and needles in their hand for a short while when they take off their splint. 
randomised controlled trials
Randomised controlled trials are medical studies designed to test whether a treatment works. Patients are split into groups. One group is given the treatment being tested (for example, an antidepressant drug) while another group (called the comparison or control group) is given an alternative treatment. This could be a different type of drug or a dummy treatment (a placebo). Researchers then compare the effects of the different treatments.
A systematic review is a thorough look through published research on a particular topic. Only studies that have been carried out to a high standard are included. A systematic review may or may not include a meta-analysis, which is when the results from individual studies are put together.
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