• Kristen L Kucera, Hester J Lipscomb, and Barbara Silverstein.
• Division of Occupational & Environmental Medicine, Duke University, 2200 W.Main St., Durham, NC 27705, USA. kristen.kucera@duke.edu
• Work. 2011 Jan 1; 39 (3): 321-30.

ObjectiveWe describe medical care received through workers' compensation (WC) and union-provided insurance surrounding work-related back injuries and examine relationships between care provided and time off work among a large cohort of carpenters.Methods And ParticipantsUnion records identified a cohort of 20,642 carpenters working in Washington State from 1989-2003 and their private health insurance claims. These data were linked to workers' compensation files from this state-run program including records of medical care.ResultsOver 74,000 WC medical encounters resulted from 2959 work-related back injuries. Eleven percent received private care for musculoskeletal back pain within 90 days of work-related injury; this proportion increased with increasing lost days. Delay to physical therapy was more prevalent among those out of work longest. The proportion of claimants with care from both systems and from private utilization only increased after the first 90 days and, for the subset with at least one paid lost work day, after return to work.ConclusionsExamination of medical care through both systems versus solely in workers' compensation provides a more complete understanding of back injury care while also demonstrating complexity. Differences in outcomes based upon treatment shortly after injury are worthy of further exploration.

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