Common Kneecap (Patella) Problems
If the kneecap is “off track” even slightly (a tracking problem), it can cause uneven pressure on the back of the kneecap. This can cause pain and difficulty with movements, such as walking and going down stairs. Below are some common causes of kneecap pain.
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Cartilage Damage
Sometimes the cartilage on the back of the kneecap or in the groove of the thighbone is damaged. Damaged cartilage can’t spread pressure evenly. Uneven pressure wears down the cartilage even further.
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Dislocation
Sometimes a muscle or ligament in the knee is pulled the wrong way. Or the kneecap may be pushed too hard. Then the kneecap may move partly out of the groove (subluxation). It may even move completely out (dislocation).
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Patellar Tendinitis
Patellar tendinitis (“jumper’s knee”) occurs when the quadriceps muscles are overused or tight. During movement, the patellar tendon absorbs more shock than usual. The tendon becomes irritated or damaged.
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Plica Band Syndrome
Plica bands are tissue fibers that some people have near the kneecap. They usually cause no problems. But sometimes they can become irritated or inflamed.
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Publication Source:
Hyman J, Rodeo SA, Wickiewicz T, DeLee and Drez's Orthopaedic Sports Medicine, 2nd ed., 8.Patellofemoral tendinopathy, 2003, pp 1840-1843
Publication Source:
Miller III RH, Campbell's Operative Orthopaedics, 10th ed., Chapter 43 - Knee injuries, 2003, pp 2303-2318
Publication Source:
Phillips BB, Campbell's Operative Orthopaedics, 10th ed., Chapter 45 - Recurrent dislocations, 2003, pp 1249-1250
Online Medical Reviewer:
Spencer, Samantha A. MD
Date Last Reviewed:
1/15/2007
Date Last Modified:
9/27/2002