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The symptoms of carpal tunnel syndrome

The symptoms of carpal tunnel syndrome

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Posted by Jin-Suk Yang on June 30, 2000 at 21:13:28:

Carpal tunnel syndrome results from compression of the median nerve inside the wrist. The median nerve and nine flexor tendons lie in a small "tunnel" formed by the carpal bones on the top of the wrist and by a ligament called the "transverse ligament" on the bottom of the wrist. Pressure on the median nerve may be caused by tendonitis or tenosynovitis of these tendons. The symptoms of carpal tunnel syndrome are pain, tingling, and numbness in the thumb and first three fingers of the hand. Clumsiness or a tendency to drop things may also result. The symptoms often manifest themselves during non-working hours.

Carpal tunnel syndrome is caused by occupational activities which involve repetitive flexing of the wrist, particularly when performed with high finger forces or grip forces; this leads to irritation and swelling of the synovial membrane inside the carpal tunnel, which causes nerve compression. Nerve compression is also caused by direct contact with the tendons inside the carpal tunnel when the wrist is flexed.

Carpal tunnel syndrome is the most prevalent nerve disorder in the category of cumulative trauma disorders (CTD) or repetitive-motion injuries. CTD occurs when nerves, muscles, tendons, and bones are aggravated by repeated exertion or movements of the body. Many risk factors have been associated with the increase of work-related CTD: they include force, posture, frequency or repetition, and inadequate rest periods or lack of recovery times between cycles.




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