Occupational mechanical exposures and reoperation after first-time XXXX : a prognosis study in a male cohort.

@entity1 @entity169 @entity547
PURPOSE: The aim of this study was to evaluate exposure-response relationships between occupational mechanical exposures and risk of reoperation after @entity169 . METHODS: Using register information, we identified all @entity1 born in Denmark 1938-1988, who had their first @entity169 1998-2008, and who were 18-65  years old and active in the labour market at the time of surgery. The Danish @entity547 Database provided information on repairs and reoperations. We used registered occupational codes and a job exposure matrix based on experts' ratings to estimate total load lifted per day, frequency of heavy lifting, and number of hours per day spent standing/walking. We also obtained register information on sickness absence. Multivariable Cox regression analysis was used. RESULTS: The cohort comprised 34,822 @entity1 . We did not reveal exposure-response relationships between occupational mechanical exposures and the hazard ratio (HR) of reoperation. The percentage of @entity1 with >2  weeks of sickness absence within 8  weeks after surgery increased with total load lifted per day from 15 to 53  %. Longer sickness absence was associated with an increased HR of reoperation, but within strata of sickness absence, we found no increase in the HR of reoperation with increasing exposures. CONCLUSION: We did not find indications that the HR of reoperation was related to occupational mechanical exposures, even after accounting for a potential protective effect of sickness absence. Hence, the exposure-related prolonged duration of sickness absence could not be explained by exposure-related complications that led to reoperation.
