The Work Ratio – modeling the likelihood of return to work for workers with musculoskeletal disorders: A fuzzy logic approach

Article type: Research Article

Authors: Apalit, Nathan

Affiliations: Worker's Compensation Board of Manitoba, 333 Broadway, Winnipeg MB R3C 4W3, Canada Tel.: +1 204 954 4085; Fax: +1 204 954 4766; E-mail: [email protected]

Abstract: The world of musculoskeletal disorders (MSDs) is complicated and fuzzy. Fuzzy logic provides a precise framework for complex problems characterized by uncertainty, vagueness and imprecision. Although fuzzy logic would appear to be an ideal modeling language to help address the complexity of MSDs, little research has been done in this regard. The Work Ratio is a novel mathematical model that uses fuzzy logic to provide a numerical and linguistic valuation of the likelihood of return to work and remaining at work. It can be used for a worker with any MSD at any point in time. Basic mathematical concepts from set theory and fuzzy logic are reviewed. A case study is then used to illustrate the use of the Work Ratio. Its potential strengths and limitations are discussed. Further research of its use with a variety of MSDs, settings and multidisciplinary teams is needed to confirm its universal value.

Keywords: Fuzzy logic, mathematical model, musculoskeletal disorders, return to work, Work Ratio

DOI: 10.3233/WOR-2010-1009

Journal: Work, vol. 36, no. 1, pp. 77-87, 2010