Chondromalacia patella occurs when the cartilage of a person’s kneecap softens. It is common in athletes of high impact sports or those who have arthritis in their knees. Chondromalacia patella is ...

Subluxation is another word for partial dislocation of a bone. Patellar subluxation is a partial dislocation of the kneecap (patella). It’s also known as patellar instability or kneecap instability.

Patellar tendonitis — also called jumper’s knee — is a type of knee tendon pain. It happens when the tendons connecting the kneecap to the shinbone become inflamed from overuse. Repetitive motions, ...