What is Osteoarthritis, and Why is It So Hard to Diagnose?

Nearly 33 million Americans have osteoarthritis. Experts explain how it affects the body, and why it’s so hard to diagnose. https://static01.nyt.com/images/2024/04/24/multimedia/WELL-OSTEOARTHRITIS1-jmlk/WELL-OSTEOARTHRITIS1-jmlk-mediumSquareAt3X.jpg