This study will assess the efficacy of products, implants, and procedures for knee and hip replacement.

This registry will prospectively collect a core set of data on patients undergoing knee or hip replacement. This registry will include a variety of different products, implants, technologies and procedures. The registry will also collect any adverse events/complications that occur during or following these surgeries. This database can also be utilized in the future to answer research questions, by retrospectively going back through the data. This information also may go to insurance companies or hospitals for quality measurement and metrics reporting. The data will be utilized to develop strategic treatment pathways that will improve patient care. Ultimately, the goal of the registry is to enhance the understanding of treatment associated with knee and hip replacement and the resulting patient outcomes. The registry will also be used to provide quality measurement and metrics reporting.

Inclusion Criteria:

• At least 18 years of age
• Undergoing knee or hip replacement
• Subject is likely to follow standard of care post-operative follow up for at least 1 year

Exclusion Criteria:

• Inability to complete follow-up visits or required questionnaires
• Inability to provide informed consent without a legally authorized representative

The study population will come from cohorts of patients undergoing either knee or hip replacement in accordance with a nationwide multicenter observational study design. Eligibility criteria require only that patients are undergoing knee or hip replacement, are able to sign informed consent and are 18 years of age or older. Approximately 10,000 patients will be enrolled