Referred pain is pain that is experienced in one part of the body but which is really arising from a different part.
Referred pain in the knee
Pain in the knee quite frequently arises from the hip.
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CLINICAL PUBLICATIONS
Don't forget the hip! Hip arthritis masquerading as knee pain. Dibra FF, Prieto HA, Gray CF and Parvataneni HK. Arthroplast Today. 2018 Mar; 4(1): 118–124.