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Dan Smith: To perform the Lachman's test,
flex the knee to 20 to 30 degrees, encourage the
patient to relax their hamstring musculature. Firmly
grasp the femur with one hand, and with the other hand
behind the proximal tibia, firmly pull displacing the
tibia upon the femur looking for the amount of
anterior displacement and the firmness of the end
point. It's always nice to compare it to the opposite
knee and if you get increased displacement or a soft
end point, this usually indicates an ACL injury.