1. Hospital for Special Surgery/Weill Cornell Medicine; New York New York
2. OrthoCarolina Hip and Knee Center; Charlotte North Carolina
3. McMaster University; Hamilton Ontario Canada
4. Mayo Clinic; Rochester Minnesota
5. Louisiana State University; New Orleans
6. University of Pennsylvania; Philadelphia
7. University of Michigan; Ann Arbor
8. Columbia University; New York New York
9. Albert Einstein College of Medicine; Bronx New York
10. Kaiser Permanente; Fontana California
11. Cleveland Clinic; Cleveland Ohio
12. Midwest Orthopaedics at Rush; Chicago Illinois
13. University of Texas Medical Branch; Galveston
14. American College of Rheumatology; Atlanta Georgia
15. Rothman Institute, Thomas Jefferson University Hospital; Philadelphia Pennsylvania
16. University of Utah; Salt Lake City
17. University of Pittsburgh; Pittsburgh Pennsylvania
18. Rockefeller University; New York New York
19. Brigham and Women's Hospital; Boston Massachusetts
20. National Data Bank for Rheumatic Diseases, Wichita, Kansas, and University of Nebraska Medical Center; Omaha
21. University of Nebraska Medical Center; Omaha
22. Dearborn-Sah Institute for Joint Restoration; Fremont California
23. University of Alabama at Birmingham