Healthcare Market-Level and Hospital-Level Disparities in Access to and Utilization of High-Quality Hip and Knee Replacement Hospitals Among Medicare Beneficiaries.

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This study aimed to determine whether healthcare markets with higher social vulnerability have lower access to high-quality hip and knee replacement hospitals and whether hospitals that serve a higher percentage of low-income patients are less likely to be designated as high-quality. This cross-sectional study used 2021 Centers for Medicare and Medicaid Services outcome measures and 2022 Joint Commission (JC) process-of-care measures to identify hospitals performing high-quality hip and knee replacement. A total of 2,682 hospitals and 304 healthcare markets were included. For the market-level analysis, we assessed the association of social vulnerability with the presence of a high-quality hip and knee replacement center. For the hospital-level analysis, we assessed the association of disproportionate share hospital (DSH) percentage with each high-quality designation. Healthcare markets were approximated by hospital referral regions. All associations were assessed with fractional regressions using generalized linear models with binomial family and logit links. We found that healthcare markets in the most vulnerable quartile were less likely to have a hip and knee replacement hospital that did better than the national average (odds ratio [OR] 0.22, P = 0.02) but not more or less likely to have a hospital certified as advanced by JC (OR 0.41, P = 0.16). We found that hip and knee replacement hospitals in the highest DSH quartile were less likely to be designated by the Centers for Medicare and Medicaid Services as better than the national average (OR 0.18, P = 0.001) but not more or less likely to be certified as advanced by JC (OR 1.40, P = 0.28). Geographic distribution of high-quality hospitals may contribute to socioeconomic disparities in patients' access to and utilization of high-quality hip and knee replacement. Equal access to and utilization of hospitals with high-quality surgical processes does not necessarily indicate equitable access to and utilization of hospitals with high-quality outcomes. Level III.