Structural deformities affect typing styles of touch typists with rheumatoid arthritis

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Structural deformities affect typing styles of touch typists with rheumatoid

arthritis

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8. November 2010 07:55

Joint damage caused by rheumatoid arthritis can lead to difficulties in

typing and can force people to seek alternative-but potentially more

destructive-ways of putting their fingers to the keyboard, according to

research presented this week at the American College of RheumatologyAnnual

Scientific Meeting in Atlanta.

Rheumatoid arthritis is a chronic disease that causes pain, stiffness,

swelling, and limitation in the motion and function of multiple joints.

Though joints are the principal body parts affected by RA, inflammation can

develop in other organs as well. An estimated 1.3 million Americans have RA,

and the disease typically affects women twice as often as men.

People who suffer from RA often experience work limitations. In fact,

without adequate treatment, 60 percent of people with RA are unable to work

10 years after the onset of their disease. The U.S. Census Bureau reports

that nearly 215,000 professionals are employed as typists. For those with RA

whose work depends on touch typing -typing based on knowing the location of

keys on a keyboard, rather than using sight to find the keys-understanding

the mechanism of hand motions during touch typing may provide insight into

how people with RA can safely and efficiently type.

In a study funded in part by the ACR Research and Education Foundation,

researchers recently set out to determine the effects of structural

deformities on the postures and motions of the hands and wrists during touch

typing. They hypothesized that touch typists with structural deformities

caused by RA would have significantly different typing postures, motions and

speeds than those without structural deformities. They studied 33

participants with RA to determine if their hypothesis would hold true.

Researchers videotaped each participant and studied their postures and

motions while typing. Additionally, each participant's video was rated by a

certified hand therapist for the presence of visual structural deformities -

damage to varying joints, which causes a visible change in the shape of the

hand. Finally, typing postures and motions were rated by two raters trained

in the use of the Keyboard-Personal Computer Style Instrument - an

observational instrument that documents postures and actions of keyboard

users.

The 22 participants with structural deformities were compared to those

without. Researchers found that participants with structural deformities due

to RA showed more whole hand and wrist motions-commonly called the

'hunt-and-peck' method of typing-than those without (64 percent) structural

deformities. These participants used this style of typing to activate the

keys rather than individual finger motions. Finally, researchers found that

significantly fewer participants with structural deformities used a wrist

support, and there was no significant difference in typing speed between the

two groups of participants.

Based on these findings, researchers concluded that structural deformities

can affect the typing styles of touch typists with RA. Moreover,

biomechanical research that examines the degree to which different postures

and actions increase or reduce mechanical stress on joints suggests that

alternative typing strategies-such as the hunt-and-peck style, floating the

wrists, using fewer fingers, and keeping fingers straight rather than

curved-may increase existing problems by putting additional stress on

already affected joints.

" This research suggests that as people develop changes in the structures of

their joints, they may find alternative ways to accomplish tasks, " says

Baker, ScD, MPH, OTR/L; associate professor at the University of

Pittsburgh and lead investigator in the study. " The alternative methods are

often to change their physical performance; for example they may slow down,

change their postures, or move differently. While changing their performance

may allow the continuance of doing the task, it may place them at risk for

other problems. Thus, touch typists with joint damage may shift to

techniques that place biomechanical stress on their already weakened

joints. "

For touch typists with RA, researchers offer alternative suggestions to

ensure proper working hand and wrist posture including using an ergonomic

keyboard and moveable wrist support and/or redesigning your computer

workstation to better suit your individual typing needs.

" While altering tasks is almost certainly necessary in any disease or injury

that causes physical changes, there are ways to make changes that are less

likely to place a person at risk, " says Dr. Baker. " It is often better to

change the environment to support the person doing the task than it is to

change the performance itself.

Occupational therapists are experts in the identification of safe and

effective alternative methods to perform daily tasks and can help people

with limitations to develop the method that best suits their needs.

Providing access to occupational therapists may allow people with diseases

like RA to identify and implement strategies that can keep them at work and

at play and living life to the fullest. "

SOURCE American College of Rheumatology