What is carpal tunnel syndrome? Carpal tunnel syndrome is a common, painful disorder of
the wrist and the hand. The condition occurs mostly in women, but
may also affect men. Carpal tunnel syndrome becomes worse with
excessive use of the wrist, as with repetitive movements in some
occupations or athletic activities.
The carpal tunnel is a passageway in the wrist formed by eight
carpal (wrist) bones, which make up the floor and sides of the
tunnel, and the transverse carpal ligament, a strong ligament
stretching across the roof of the tunnel. Within the carpal tunnel
are nine tendons, which are each about the size of a pencil. These
tendons join the muscles of the forearm to the fingers and thumb.
As the forearm muscles contract, these tendons move toward the
elbow and bend the fingers toward the palm.
One other structure within the carpal tunnel is the median nerve,
about the size of a pencil, which contains thousands of nerve
fibres carrying sensation from the thumb, index and middle
fingers, and half of the ring finger. In a healthy wrist, the
tendons, median nerve, and transverse ligament work in harmony,
but in the case where the carpal tunnel contents may be swollen,
the patient can experience a sensation of ‘pins and needles,’
numbness and aching in the fingers, wrist and arm due to increased
pressure on the median nerve.
What is the cause? Carpal tunnel syndrome is caused by pressure on the
median nerve in the wrist. People who use their hands and wrists
repeatedly in the same way, e.g. carpenters, tend to develop
carpal tunnel syndrome. Pressure on the nerve may also be caused
by a fracture or other injury, which may cause inflammation and
swelling. In addition, pressure may be caused by inflammation and
swelling associated with arthritis, diabetes, and hypothyroidism.
Carpal tunnel syndrome can also occur during pregnancy.
What are the symptoms? The symptoms include:
* pain, numbness, or tingling in the hand and wrist, especially in
the thumb, index and middle fingers
* increased pain with increased use of the hand, such as while
driving or reading the newspaper
* increased pain at night
* weak grip and tendency to drop objects held in the hand
* sensitivity to cold
* muscle weakness
What is the diagnosis? The doctor reviews the symptoms and does a physical
examination:
* he may tap the inside middle of the wrist over the median nerve
which may cause pain or a sensation like an electric shock
* he may bend the wrist down for one minute to see if this causes
the symptoms
* the doctor may arrange to test the response of the nerves and
muscles to electrical stimulation
What is the treatment?
If a disease is causing carpal tunnel syndrome (such as rheumatoid
arthritis), treatment of the disease may relieve the symptoms.
Other treatment focuses on relieving irritation and pressure on
the nerve in the wrist. To relieve pressure the following is
suggested:
* restricting use of the hand or changing the way of using it
* wearing a wrist splint
* exercises
The doctor may prescribe an oral cortisone like medicine or a
nonsteroidal anti-inflammatory medicine, such as ibuprofen. He may
recommend an injection of cortisone like medicine into the carpal
tunnel area. In some cases surgery may be necessary.
How long the symptoms of carpal tunnel syndrome last depend on the
cause and the response to treatment. The symptoms may disappear
without any treatment or may need nonsurgical treatment for
relief. Surgery may be necessary to relieve the symptoms if they
do not respond to treatment or if they get worse. Surgery usually
relieves the symptoms, especially if there is no permanent damage
to the nerve.
Symptoms of carpal tunnel syndrome that occur during pregnancy
usually disappear following delivery.
What is the prevention?
The following can be done:
* elevate the arm with pillows while lying down
* avoid activities that overuse the hand
* find a different way to use the hand by using another tool or
try to
* use the other hand
* avoid bending the wrists
While doing some kind of repetitive work with the hands, make sure
that hands and wrists are comfortable. Take regular breaks from
the repetitive motion. Avoid resting the wrists on hard or ridged
surfaces for prolonged periods. If one has a disease that is
associated with carpal tunnel syndrome, effective treatment of the
disease might help prevent this condition. In some cases the cause
is not known and carpal tunnel syndrome cannot be prevented.
Causes For Carpal Tunnel Syndrome
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Exercises for carpal
tunnel syndrome
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