10. Separable Bones
The shinbone should not move away from the knee at any time. If you have an ACL tear, the Lachman test can determine whether the ligament is still attached. When lying down, a doctor or therapist places the injured knee at a 30-40 degree angle. Holding the femur with one hand, they take hold of the lower leg at the top of the calf muscle and pull slightly up and away from the knee. If the ACL is torn, there will be a sloppy movement of the bone coming away from the knee. If not, there should not be much movement at all within the knee joint. Please do not perform this test on someone who has freshly injured their ACL.
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