Neutral position, mainly at night
For carpal tunnel syndrome, a wrist splint is one of the first conservative treatments. The correct instruction is to wear it with the wrist in neutral, straight in line with the forearm, and mainly at night. Pressure inside the carpal tunnel is lowest when the wrist is neutral and rises when the wrist bends either down (flexion) or up (extension). Holding the wrist straight therefore gives the compressed median nerve the most room.
Why night use is the main purpose
Many people sleep with their wrists curled into flexion, sometimes for hours. That posture squeezes the median nerve and explains why carpal tunnel symptoms are typically worst at night and wake people with numbness, tingling, or a need to shake the hand. A splint worn during sleep prevents the flexed posture and is often enough to relieve night symptoms. Daytime use may be added during aggravating tasks if it does not interfere with safe work.
| Wrist position | Carpal tunnel pressure | Use in splinting |
|---|
| Neutral | Lowest | Correct |
| Flexed (bent down) | Raised | Avoid |
| Extended (bent up) | Raised | Avoid |
Why the other instructions are wrong
A splint that holds the wrist bent downward places it in flexion, the position that compresses the nerve most, which is the reverse of the goal. A splint holding the wrist bent upward during sewing only is wrong twice: extension also raises pressure, and limiting use to work hours misses the night, when symptoms are worst. Wearing the splint during work only and removing it before sleep discards its main benefit.
Other teaching for the worker
The nurse also teaches the worker to take regular breaks from repetitive tasks, to keep the wrists straight while sewing by adjusting chair and table height, to avoid prolonged forceful gripping, and to report weakness, dropping objects, or wasting at the base of the thumb, which suggest worsening nerve compression. If splinting and activity changes do not help, the physician may consider a corticosteroid injection or surgical release.
Exam takeaway
Key point Carpal tunnel splint: neutral wrist, worn especially at night. Any option with a flexed or extended wrist, or with removal at night, is wrong.