Chondromalacia is the degeneration of the hyaline cartilage on the under surface of the kneecap. Its causes include patella maltracking (the kneecap does not glide properly over the joint), posttraumatic condition, and chronic overuse. The treatment can be a controlled rehabilitation program, various bracing techniques, foot orthoses, or, in severe cases, surgery. If the knee hurts, the activity responsible for the pain should be discontinued. If the condition persists, the advice of a physician should be sought. (DC)