Schwartz AM, Farley KX, Nazzal E, et al. - Querying the Nationwide Readmission Database from 2011-2016, they assessed data from patients undergoing revision hip arthroplasty in order to define the evidence-based institutional volume-outcome relationship in revision hip arthroplasty. Per their hypothesis, high-volume centers would be correlated with better outcomes, and stratum-specific likelihood ratio (SSLR) analysis would describe concrete volume thresholds for optimizing outcomes. For all outcomes, distinct hospital volume cut-offs were produced by SSLR analysis. Patients' risk for adverse outcomes reduced with each subsequent volume threshold. Findings revealed tertiles for 90-day infection (≤ 6, 7-51, ≥ 52 cases/year) and revealed quartiles for 90-day readmission (≤ 5, 6-15, 16-79, ≥ 80), 90-day prosthesis-related complication (≤ 5, 6-16, 17-65, ≥ 66), 90-day dislocation (≤ 5, 6-19, 20-79, ≥ 80), and non-home discharge (≤ 5, 6-15, 16-40, and ≥ 41). They generated quintiles for extended length of stay > 2 days (≤ 2, 3-10, 11-20, 21-30, ≥ 31) and produced heptiles for medical complication within 90 days (≤ 2, 3-8, 9-16, 17-51, 52-89, ≥ 90). Researchers identified this work to be the first known study defining evidence-based thresholds for the impact of hospital volume on revision joint arthroplasty. They support the value of institutional volume as a surrogate for protocolized interdisciplinary coordination of care and surgical experience and identified that high-volume centers offer enhanced outcomes for complex cases.