Wrist motions and CTD risk in industrial and service environments.
Marras WS; Schoenmarklin RW
Designing for Everyone, Proceedings of the Eleventh Congress of the International Ergonomics Association, Paris, 1991. Queinnec Y, Daniellou F, Chapon A, eds., London: Taylor and Francis, 1991 Sep; 1:36-38
A study of the association between wrist motions in highly repetitive work and the risk of cumulative trauma disorder was conducted. The study group consisted of 40 industrial workers who worked on assembly lines in eight factories. Half were employed in jobs associated with a high risk of carpal tunnel syndrome (CTS). A previous study of these jobs found a CTS prevalence of 8 cases per 200,000 hours. The remaining workers were employed in jobs having a low risk of CTS. The subjects were instrumented with wrist monitors that measured angular position, velocity, and acceleration of the wrist for at least ten work cycles. The motion components were measured in the flexion and extension, radial and ulnar, and pronation and supination planes of the wrist. All measured wrist motion parameters were significantly higher in the high CTS risk group than in the low risk group. Logistic regression analysis indicated that velocity and acceleration in the flexion and extension plane of the wrist were associated with the greatest risk of CTS, odds ratios 3.80 and 6.50, respectively. Wrist angle and range of motion were not significantly associated with an elevated risk for CTS. The authors conclude that wrist accelerations in the flexion and extension plane are most closely associated with the risk for developing CTS.
NIOSH-Grant; Musculoskeletal-system-disorders; Hand-injuries; Carpal-tunnel-syndrome; Repetitive-work; Risk-analysis; Biomechanics; Assembly-line-workers; Cumulative-trauma-disorders
Industrial and Systems Engr Ohio State University 1971 Neil Avenue Columbus, Ohio 43210
Queinnec Y; Daniellou F; Chapon A
Designing for Everyone, Proceedings of the Eleventh Congress of the International Ergonomics Association, Paris, 1991, Vol. 1
Ohio State University, Columbus, Ohio