Has anybody out there had their knee give out? I'm sure at least once we all have experienced this. You know why this happens? Besides it being some ligament tear in the knee, it's the popliteus muscle behind the knee cap. This muscle originates from the conduce of the femur to the proximal tibia (posterior portion). It helps unlock the knee when it's locked or extended out. So it could be weak or just decide to unlock your knee too quickly.
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