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Fig. 1 | Arthritis Research & Therapy

Fig. 1

From: Opioid users show worse baseline knee osteoarthritis and faster progression of degenerative changes: a retrospective case-control study based on data from the Osteoarthritis Initiative (OAI)

Fig. 1

Flow chart depicting inclusion and exclusion criteria for opioid user cohorts. Cross-sectional opioid use was defined by the MIFUSE variable (MIFUSE = 1). Longitudinal opioid use was defined as opioid use at baseline and 4-year follow-up (MIFUSE = 1, respectively) and opioid use duration of at least 1 year at follow-up (MIFDUR ≥ 3)

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