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A member asked:
Pain behind the knee, if sitting down when straightening the knee it's very painful. what can this be . ?
2 doctors weighed in across 2 answers
Baker's Cyst: Oftentimes you can have an outpouching of the synovial membrane that lines the joint.
Answered 4/4/2013
5.2k views
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A number of things: Could be a baker's cyst (as dr. Fisher said), torn cartilage, bursitis, arthritis, popliteal vein entrapment, etc. Impossible to say online without an examination. As a start, see your doctor.
Answered 5/13/2015
5.2k views
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