Chondromalacia patella (knee pain) is caused by the softening and breakdown of the cartilage on the underside of the kneecap (patella). When the knee and the thigh bone (femur) rub together, pain occurs. When the knee is flexed, you may experience dull, aching pain and/or a grinding sensation.
Causes and Risk Factors
Chondromalacia patella is a condition in which the undersurface of the kneecap collides with the thigh bone, causing swelling and pain. Abnormal knee cap positioning, tightness or weakness of the muscles surrounding the knee, excessive knee activity, and flat feet may all increase the risk of chondromalacia patella.