Patellofemoral: Syndrome (pfs) would be my first guess. It sounds like you may have some arthritis in your knee and pfs which causes poor tracking in the femoral groove. This is often noticed after sitting for a while or and going up stairs. Recommend physical exam, xray, and physical therapy for quad strengthening and functional modification for long term benefit. Hope that helps!
Answered 3/28/2014
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A doctor has provided 1 answer
3 doctors weighed in across 2 answers
2 doctors weighed in across 2 answers
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