Discriminating between individuals with and without musculoskeletal disorders of the upper extremity by means of items related to computer keyboard use.
Baker-NA; Sussman-NB; Redfern-MS
J Occup Rehabil 2008 Jun; 18(2):157-165
Introduction: identifying postures and behaviors during keyboard use that can discriminate between individuals with and without musculoskeletal disorders of the upper extremity (MSD-UE) is important for developing intervention strategies. This study explores the ability of models built from items of the Keyboard-Personal Computer Style instrument (K-PeCS) to discriminate between subjects who have MSD-UE and those who do not. Methods: forty-two subjects, 21 with diagnosed MSD-UE (cases) and 21 without MSD-UE (controls), were videotaped while using their keyboards at their onsite computer workstations. These video clips were rated using the K-PeCS. The K-PeCS items were used to generate models to discriminate between cases and controls using Classification and Regression Tree (CART) methods. Results: two CART models were generated; one that could accurately discriminate between cases and controls when the cases had any diagnosis of MSD-UE (69% accuracy) and one that could accurately discriminate between cases and controls when the cases had neck-related MSD-UE (93% accuracy). Both models had the same single item, "neck flexion angle greater than 20°". In both models, subjects who did not have a neck flexion angle of greater than 20° were accurately identified as controls. Conclusions: the K-PeCS item "neck flexion greater than 20°" can discriminate between subjects with and without MSD-UE. Further research with a larger sample is needed to develop models that have greater accuracy.
Posture; Risk-analysis; Safety-monitoring; Musculoskeletal-system-disorders; Risk-factors; Safety-practices; Ergonomics; Biomechanics; Models; Biomechanics; Biomechanical-modeling; Skeletal-movement; Statistical-analysis; Mathematical-models
Nancy A. Baker, Department of Occupational Therapy, University of Pittsburgh, 5012 Forbes Tower, Pittsburgh, PA 15260
Journal of Occupational Rehabilitation
University of Pittsburgh