The Knee Replacement Procedure
Total knee replacement, also called total knee arthroplasty, uses metal
alloy and polyethylene (plastic) components to resurface the bones in
the joint. The implants are designed to re-create the shape of the
bones in a healthy joint.
The end of the thighbone (femur) can be compared to a rocking chair. It
has two distinct surfaces, or rockers, that contact the top of the
shinbone (tiba). Each rocker is called a condyle, and there are two
condyles at the end of the thighbone. The femoral component re-creates
each rocker at the end of the thighbone. The top of the tibia is
covered with a metal tray that is used to support a polyethylene
plastic bearing. The polyethylene acts as the joint's cartilage,
absorbing stress and providing smooth movement. The Patellar articular
surface may or may not be replaced. If replaced the polyethylene on the
back of the kneecap also provides smooth movement against the femoral
component.
Healthy Knee
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Arthritic Knee
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After Surgery
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Knee Implant
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