Patellar tendinitis causes pain in the patellar tendon, which runs from the kneecap (patella) to the shinbone (tibia).
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Make a gift before July 31 and it can be doubled in impact thanks to a $100,000 Summer Challenge.