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How Does It Work?
Natural Knee
EVOLUTION® Medial-Pivot Knee
A normal knee is more complex than a simple hinge; it pivots on its inner (medial) side. When the knee bends, the outer (lateral) side rolls back while the inner (medial) side pivots in one place. The EVOLUTION® Medial-Pivot Knee System was designed to replicate this motion.
Why a Ball-in-Socket?
Recent studies of the knee show that the medial side remains stable like a ball-in-socket joint, while the lateral side moves front to back.1 Only medial-pivot knees feature ball-in-socket technology.
The natural knee has a number of stabilizing structures, most of which are removed during total knee replacement. Wright’s ball-in-socket knees imitate these natural structures which makes them more similar to the normal knee than traditional total knee implants.12 Refer to the videos on the right to see how Wright's Medial-Pivot Knees imitate the natural motion of the knee.
As shown in the videos, the spherical shape of the Wright Medial-Pivot femur imitates the spherical femur found in the natural knee. The ball-in-socket in Wright Medial-Pivot Knees provides the ability to rotate your knee like a natural knee. This motion is important for activities such as kneeling, descending stairs, and golfing.
