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Welcome to our health education library. The information shared below is provided to you as an educational and informational source only and is not intended to replace a medical examination or consultation, or medical advice given to you by a physician or medical professional.

The Kneecap (Patella) in ActionLa r³tula en acci³n

The Kneecap (Patella) in Action

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.

When the Kneecap is "On Track"

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.

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When the Kneecap Gets "Off Track"

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.

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Date Last Reviewed: 2007-01-15T00:00:00-07:00

Date Last Modified: 2002-07-09T08:39:58-06:00

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“It’s been a year since Mom’s surgery, and I wanted to send some pictures to show you how great she’s doing. In October, she went to Ft. Walton Beach, FL , with my brother and sister-in-law. She truly enjoyed herself. In December, she and I flew to Seattle, WA, to visit our cousins.

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