P-150 What Are Work-Related Physical and Psychological Prognostic Factors for Disability in Construction Workers With Knee Osteoarthritis: A Prospective Cohort Study Based on Worker Health Surveillance Data

Introduction To select effective interventions to enhance work ability in construction workers with knee osteoarthritis (KO), knowledge of prognostic factors is needed given that occupational physicians see differences in sick leave episodes despite similar degrees of KO. This study assesses work-related physical and psychological prognostic factors over time in a cohort of construction workers with KO. Methods Based on worker health surveillance (WHS), 277 male construction workers diagnosed with KO and having at least two completed WHS over the time period 2000 – 2020 were selected. 80% of these workers had three or more completed WHS. The dependent variable was the Work (Dis)Ability Indicator showing the risk of work disability in the upcoming four years. This indicator was specifically developed for the Dutch construction industry and based on age, sickness absence, work ability index and musculoskeletal complaints. The score varies between 2%-79%. A score >38% indicates that interventions are needed to prevent work disability. Generalized estimating equation was used for multivariable analyses after selecting relevant variables based on univariable analyses. Results Workers (mean age 54 years, BMI 28 kg/m2) worked mainly as bricklayers, carpenters or tilers. Clinically relevant prognostic factors were: personal (better self-rated health, lower BMI and younger age), physical (less kneeling/squatting during work) and psychological (sufficient payment, having supervisor support and less time pressure). Discussion and conclusion To support the work ability of workers with KO, modifiable work-related physical and psychological prognostic factors are reducing kneeling/squatting during work and securing sufficient payment, having supervisor support and reducing time pressure.