The Aggregation of Marginal Gains in Total Joint Arthroplasty: A Practical Framework for Scalable, High-Quality Care.

Demand for total hip and knee arthroplasties continues to increase faster than many programs can expand operating room capacity, clinic access, and workforce. Although major technological investments may improve care, small recurring inefficiencies throughout the episode of care can also produce substantial cumulative losses. The aggregation of marginal gains offers a disciplined approach: identify a defined constraint, establish a baseline, introduce a targeted change, measure process, outcome, and balancing measures, and retain only changes that improve the system. This perspective applies that approach across the preoperative, intraoperative, and postoperative phases of care, using operative efficiency, wound management, blood management, discharge, follow-up, and workforce design as illustrative domains. A practice-level example demonstrates how reductions in closure time and routine postoperative visits can be translated into theoretical annual capacity. These calculations are arithmetic estimates rather than causal or product-specific effects. The framework emphasizes sequential implementation, explicit ownership, standardized definitions, prospective exposure capture, and predetermined decision criteria. Marginal gains should not be viewed as a collection of preferred products or isolated efficiency measures, but as a learning system designed to improve access while preserving clinical outcomes, patient experience, and workforce sustainability. When used with appropriate safeguards, this approach may provide a practical and scalable model for total joint arthroplasty programs.