Computer World. Матросова Т.А. - 82 стр.

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inflammatories, or physical therapy, or with surgery to loosen the transverse carpal
ligament. Recovery of wrist and hand function is often, but not always, complete.
Causes
Like many skeletomuscular disorders, CTS has a variety of causes. It is most often
the result of a combination of factors. Among these are:
Genetic predisposition. Certain people are more likely than others to get CTS.
The amount of natural lubrication of the flexor tendons varies from person to person.
The less lubrication, the more likely is CTS. One study has related the cross-sectional
shape of the wrist, and the associated geometry of the carpal tunnel, to CTS. Certain
tunnel geometries are more susceptible to tendon irritation.
Health and lifestyle. People with diabetes, gout, and rheumatoid arthritis are
more prone than others to develop CTS, as, are those experiencing the hormonal
changes. Job stress has also been linked to an increased likelihood of CTS. And CTS
seems to be more frequent among alcoholics.
Repetitive motion. The most common cause of CTS that’s been attributed to the
workplace is repetitive motion. When you flex your hand or fingers the flexor
tendons rub against the walls of the carpal tunnel. If you allow your hand time to
recover, this rubbing is not likely to lead to irritation. The amount of recovery time
you need varies from fractions of a second to minutes, depending on many
circumstances, including the genetic and health factors mentioned above, as well as
the intensity of the flexing, the weight of any objects in your hand, and the extent to
which you bend your wrist during flexing.
Trauma. A blow to the wrist or forearm can make the tendons swell and cause or
encourage the onset of CTS.
Prevention
Computer keyboard users can take several steps to lower their chances of
developing CTS. Some of these center around the configuration of the workplace, or
«ergonomics.» Others have to do with human factors.
Ergonomics. Proper seating is crucial to good ergonomics. The height of your
seat and the position of your backrest should be adjustable. The chair should be on
wheels so you can move it easily. Arm rests on the chair, though optional, are often
helpfu l.
Table height. To adjust the chair properly, look first at the height of the table or
desk surface on which your keyboard rests. On the average, a height of 27-29 inches
above the floor is recommended. Taller people will prefer slightly higher tables than
do shorter people. If you can adjust your table, set your waist angle at 90 degree, then
adjust your table so that your elbow makes a 90 degree angle when your hands are on
the keyboard.

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