Watch this video (http://openstaxcollege.org/l/flexext) to learn more about the flexion and extension ofthe knee, as the femur both rolls and glides on the tibiato maintain stable contact between the bones in all kneepositions. The patella glides along a groove on the anteriorside of the distal femur. The collateral ligaments on thesides of the knee become tight in the fully extendedposition to help stabilize the knee. The posterior cruciateligament supports the knee when flexed and the anteriorcruciate ligament becomes tight when the knee comes intofull extension to resist hyperextension. What are theligaments that support the knee joint?

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