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The Four Points of Leverage combine to successfully apply
a net differential posterior force, or constant force
to the tibia, which reduces the instability in the ACL.
This Four Points of Leverage design is used on the Defiance
III, Defiance, Armor, Female Fource, 4TITUDE and Legend
braces.
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Point 1 Anterior: The first point
of leverage is the anterior thigh cuff. It acts as
a point for rotating the femur anteriorly.
Point 2 Posterior: The second point
of leverage is the posterior calf cuff. It acts as
a point for rotating the tibia posteriorly.
Point 3 Posterior: The third point
of leverage is a posterior thigh strap, which is applied
while drawing the hinge bars posteriorly on the knee.
Point 4 Anterior: Incorporating
the fourth point generates the crucial opposing force.
By tightening and affixing the anterior tibial strap,
the hinge is drawn into proper position, and the tibia
is rotated posteriorly. |
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