Wrist Injuries Incurred from Repetitive Motion

Abstract

Between 1978 and 1980, the number of reported wrist injuries increased from a rate of two cases per one hundred employees to sixteen cases per one hundred employees in one department of a paper products manufacturing company; costs of $158,000 were incurred by the company. These injuries included carpal tunrel syndrome and disorders including pain, numbness, tingling, aching, and weakness. In 1982, a retrospective epidemiological study was conducted to analyze this problem within the department population of forty-eight female employees classified as “flyers”. “Flying” involves sustained, repetitive movements of the upper extremities to accomplish the tasks of lifting, inspecting, and packing of flattened cartons. Data regarding relevant agent, host and environmental variables were collected by means of a self-administered questionnaire. Specific techniques ensured confidentiality and validation of information. Data analyses including a variety of statistical techniques were conducted through computer application. The mean age, height, and length of time on the job were significantly less in workers with injuries/symptoms than in those without (p<0.05). Injured workers identified more frequently the fact that large carcons and increased machine speed made a difference as to how their forearms, wrists or hands felt (p<0.05). The results of this study indicate that the younger, shorter, lees experienced worker is most susceptible to wrist injuries/problems associated with repetitive motion tasks. Applications of ergonomic principles and formal training are considered as results of these findings.