Evidence-based clinical practice guidelines (CPGs) have the potential to bring the best-quality evidence to orthopaedic surgeons and their patients. CPGs can improve quality by decreasing the variability in orthopaedic care, but they can also be misused through inappropriate development or application. The quality of a CPG is dependent on the strength of its evidence base, which is often deficient in orthopaedic publications. In addition, many surgeons express concern about legal liability associated with CPGs. Specific processes in CPG development and implementation can counter these potential problems. Other evidence tools, such as appropriate use criteria, also can help in the application of the proper treatment of patients by identifying those who are appropriate for specific procedures. Because payers, patients, and surgeons need access to the best evidence, CPGs will continue to be developed, and orthopaedic surgeons have the opportunity to ensure their proper development and implementation by understanding and participating in the process.