Dynamic capabilities of the wrist joint in industrial workers.
Int J Ind Ergon 1993 Jun; 11(3):207-224
A study of the dynamic capabilities of the wrist joint in industrial workers was conducted. The study group consisted of 39 industrial workers, 22 males, average age 41.73 years, whose jobs required highly repetitive hand and wrist motions. The wrists of both hands were instrumented with specially designed goniometers and their wrist motions were monitored while they performed their jobs. Changes in the range of motion and peak velocity and acceleration in the radial/ulnar, flexion/extension, and pronation/supination planes were determined from the data. Attempts were made to correlate the data with height, weight, shoulder height, arm length, trunk depth, shoulder to elbow length, and 12 specific hand and wrist anthropometric variables. The mean maximum radial and ulnar deviations were approximately 24 and 28 degrees (deg), respectively. The mean maximum flexion and extension angles were approximately 62 and 57deg, respectively. The mean maximum pronation and supination angles were 80 and 100deg, respectively. The peak velocity and accelerations were similar for both the dominant and nondominant hands. Peak velocity and acceleration in the radial/ulnar plane averaged 450deg per second (sec) and 7,500deg/sec2. Peak velocity and acceleration in the flexion/extension plane averaged 1,000deg/sec and 16,000deg/sec2. The mean peak velocity and acceleration in the pronation/supination plane were 2,200deg/sec and 45,000deg/sec2. The peak velocity and acceleration data were poorly correlated with the anthropometric data. The authors conclude that these data should be useful for determining whether jobs that require repeated rapid wrist motions can be performed without increasing the risk of a cumulative trauma disorder.
NIOSH-Grant; Musculoskeletal-system-disorders; Ergonomics; Cumulative-trauma-disorders; Hand-injuries; Injury-prevention; Biomechanics; Industrial-factory-workers
Industrial and Systems Engr Ohio State University 1971 Neil Avenue Columbus, Ohio 43210
International Journal of Industrial Ergonomics
Ohio State University, Columbus, Ohio