Loudoun County, Va. — Patellofemoral pain is a condition in which the cartilage under the kneecap is damaged due to injury or overuse. But how do you know if you have it?

NOTE FROM OUR SPONSOR: At Loudoun Sports Therapy Center, we want to work with coaches, parents and athletes themselves and help them get ahead of the injuries so they’re not losing playing time, having to rework line-ups because of injuries and keep athletes healthy all season long.