The patella is the knee cap and it is not uncommon, particularly in teenagers, to have soreness around the knee cap. This is usually felt more when using stairs or during prolonged sitting. Physiotherapy can help by assessing the cause of the pain and providing treatment options which are likely to include stretching and strengthening exercises and taping.

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American Academy of Orthopaedic Surgeons OrthoInfo Patellofemoral pain Syndrome

http://orthoinfo.aaos.org/topic.cfm?topic=A00680

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RCH Orthopaedic Fact Sheet 17