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As the leg moves, the kneecap moves, too. It slides up and down its track on the thighbone. But if the kneecap slides “off track”—even a little—pain and damage can result.
The kneecap is controlled by muscles and ligaments that work like a system of pulleys. This system includes the quadriceps muscles, retinacula, and patellar tendon. If all these parts pull in just the right way, the kneecap stays in place and glides easily in its track. Pressure is spread evenly on the back of the kneecap.
An injury can cause some muscles or ligaments to pull too hard or not hard enough. When that happens, the kneecap no longer glides easily against the thighbone. Pressure may be spread unevenly on the back of the kneecap, causing wear and tear on the cartilage.