Background: Despite strong evidence supporting the efficacy of total knee arthroplasty (TKA), studies have shown significant socioeconomic disparities regarding who ultimately undergoes TKA. The purpose of the current study is to evaluate socioeconomic factors affecting whether a patient undergoes TKA after a diagnosis of osteoarthritis.
Methods: From 2011 to 2018, claims for adult patients diagnosed with knee osteoarthritis in the New York Statewide Planning and Research Cooperative System (SPARCS) database were analyzed. International Classification of Diseases (ICD), 9/10 CM codes were used to identify the initial diagnosis for each patient. ICD 9/10 PCS codes were used to identify subsequent TKA. Logistic regression analysis was performed to determine the effect of patient factors on the likelihood of having TKA.
Results: Of 313,794 osteoarthritis diagnoses, 33.3% proceeded to undergo TKA. Increased age (OR 1.007, P < .0001) and workers' compensation relative to commercial insurance (OR 1.865, P < .0001) had increased odds of TKA. Compared to White race, Asian (OR 0.705, P < .0001), Black (OR 0.497, P < .0001), and "other" race (OR 0.563, P < .0001) had lower odds of TKA. Hispanic ethnicity (OR 0.597, P < .0001) had lower odds of surgery. Compared to commercial insurance, Medicare (OR 0.876, P < .0001), Medicaid (OR 0.452, P < .0001), self-pay (OR 0.523, P < .0001), and "other" insurance (OR 0.819, P < .0001) had lower odds of TKA. Increased social deprivation (OR 0.987, P < .0001) had lower odds of TKA.
Conclusion: TKA is associated with disparities among race, ethnicity, primary insurance, and social deprivation. Additional research is necessary to identify the cause of these disparities to improve equity in orthopedic care.
Keywords: TKA; disparities; osteoarthritis; socioeconomic factors; total knee arthroplasty; utilization.
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