Patellar Tracking Disorder (cont.)
IN THIS ARTICLE
Symptoms of patellar tracking disorder can include:
Knee pain has many causes. If you have knee pain when you are squatting, standing up from a sitting position, going down stairs, or sitting, you may have patellar tracking disorder. But other conditions cause symptoms similar to those of patellar tracking disorder. For more information on other causes of knee symptoms, see the topic Knee Problems and Injuries.
Patellar tracking disorder is a condition that disrupts the normal function of the knee.
Normal kneecap function
As your knee straightens and bends, the kneecap (patella) glides up and down the femoral groove at the front end of the thighbone (femur). At the same time, the patella tilts and rotates slightly, held in check by ligaments on the sides and tendons on the top and bottom.
See a picture of the knee joint.
The kneecap can shift, tilt, or rotate off track (sublux) if:
And as you bend your knee to a 90-degree angle, a misaligned kneecap will have increasing abnormal contact with the thighbone, creating painful pressure.
In extreme cases, the kneecap can dislocate. After a kneecap has been dislocated once, it may dislocate more easily in the future. Any resulting damage to the kneecap or supportive tissue can lead to ongoing patellar tracking problems.
Untreated patellar tracking disorder can lead to:
A blow to the middle or inside of a structurally sound kneecap can also dislocate the kneecap.
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