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Work-Related Carpal Tunnel Syndrome-Reply FREE

Neil Maizlish, PhD; Kate Cummings, MPH; Lawrence J. Fine, MD, DrPh; Thomas D. Matte, MD, MPH; Edward L. Baker, MD, MPH
JAMA. 1990;263(2):237-237. doi:10.1001/jama.1990.03440020070029
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In Reply.—  We believe Dr Nathan may have misunderstood the purpose of the Santa Clara physician survey. The survey was not intended to assess whether repetitive, forceful, or awkward hand movements increase the risk of CTS. That association has been firmly established in numerous studies.1-3Dr Nathan cites a single survey4 as evidence against an association between occupational factors and CTS, even though workers in jobs requiring both forceful and highly repetitive hand movements did have a higher prevalence (61%) of slowed median nerve conduction than did workers in the lowest-risk jobs (28%). Reasons why an even stronger effect of ergonomic factors was not observed may include the following: the small number of subjects (23) in the highest-risk group; the exclusion of subjects with previous surgery for CTS; exposure misclassification (objective measurements of force and repetitiveness were not made); survivor bias (symptomatic workers tend to leave high-risk jobs);

REFERENCES

National Institute for Occupational Safety and Health. Cumulative Trauma Disorders: A Manual for Musculoskeletal Diseases of the Upper Limbs . London, England: Taylor & Francis Ltd; 1988;:25-28.
Armstrong TS, Silverstein BA.  Upper-extremity pain in the workplace: role of usage in causality . In: Hadler NM, ed. Clinical Concepts in Regional Musculoskeletal Illness . New York, NY: Grune & Stratton; 1987;:333-354.
Carpal Tunnel Syndrome, Selected References . Cincinnati, Ohio: National Institute for Occupational Safety and Health; 1989;.
Nathan PA, Meadows KD, Doyle LS.  Occupation as a risk factor for impaired sensory conduction of the median nerve at the carpal tunnel . J Hand Surg Br. 1988;;13B:167-170.

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National Institute for Occupational Safety and Health. Cumulative Trauma Disorders: A Manual for Musculoskeletal Diseases of the Upper Limbs . London, England: Taylor & Francis Ltd; 1988;:25-28.
Armstrong TS, Silverstein BA.  Upper-extremity pain in the workplace: role of usage in causality . In: Hadler NM, ed. Clinical Concepts in Regional Musculoskeletal Illness . New York, NY: Grune & Stratton; 1987;:333-354.
Carpal Tunnel Syndrome, Selected References . Cincinnati, Ohio: National Institute for Occupational Safety and Health; 1989;.
Nathan PA, Meadows KD, Doyle LS.  Occupation as a risk factor for impaired sensory conduction of the median nerve at the carpal tunnel . J Hand Surg Br. 1988;;13B:167-170.
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