PARTIAL SQUAT -
Contrary to popular belief, squatting to just above the parallel
position - knees at approximately 90 degrees flexion - can be more
dangerous than going to parallel or below. For one thing, at about
90 degrees flexion, the tibia's sloped shape allows it to shear
upward and over the femur.
This causes compressive forces against
the patella and pulls forcefully against the posterior cruciate
ligament when performing the partial squat workout. These forces decrease as you descend farther into the
squat position, largely because the tibia's surface isn't as sloped posteriorly, where it articulates with the femur.
Second, because of
better leverage while doing partial squat, you are obliged to use a
heavier weight to gain any adaptive overload, which can be dangerous
to the shoulder girdle, neck, low back and knees.
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