June 11th, 2003

Carpal Tunnel Not the Keyboard’s Fault

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Researchers in Denmark have once again raised doubts that keyboard usage has an impact on developing Carpal Tunnel Syndrome (CTS), stating that, in their opinion, keyboards are not an “occupational risk for developing carpal tunnel syndrome.”

Their findings are the result of a one year follow-up study of nearly 6000 Danish workers who had been surveyed previously regarding the symptom distribution and frequency of CTS.

According to a report in the Journal of American Medicine (JAMA), the researchers found “a prevalence of possible carpal tunnel syndrome between 1.4 percent and 4.8 percent based on a screening questionnaire and a clinical interview, and an incidence of new or aggravated symptoms of possible carpal tunnel syndrome of 5.5 percent.” This, concluded the researchers, “does not pose a severe occupational hazard for developing (the) symptoms” of CTS.

The goal of the study was to determine whether or not work-related keyboard and mouse use could contribute to the development of CTS. While the researchers indicated that keyboard usage probably is not linked to CTS, they did find an association between using a mouse for more than 20 hours each week and a slightly elevated risk of developing CTS. They also noted that evidence existed that linked “forceful industrial work” to the development of CTS.

These findings will come as no surprise to readers of The Ergonomics Report

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