American Orthopedic Society for Sports Medicine
The American College of Sports Medicine
Information provided by the American Association of Hip and Knee Surgeons for patients contemplating joint replacement surgery.
http://www.aahks.org/care-for-hips-and-knees/
Orthoinfo.org : Useful patient information published by the American Academy of Orthopedic Surgeons on a variety of orthopedic topics
AAOS.org : The American Academy of Orthopedic Surgeons Website.