Cementless Knee Replacements

Posted on Tuesday, June 25, 2019 in Videos

For younger knee replacement candidates, cementless knee replacements can provide longer-lasting joint relief. Dr. Berni of Signature Orthopedics St. Charles explains how this procedure could help you get back to an active lifestyle.

Transcript

The traditional way to fix knee replacements is to use bone cement and one of the downsides to that is the bone cement can loosen over time particularly if your activities have been very demanding or involved any sort of impact. The way that I have been doing knee replacements exclusively for over 15 years is in a non-cemented fashion where we do not fix the components to the bones with cement.

Knee replacement exploded diagramIn the case of the lower component, these are fixed down to the bone with screws and here you see a component that's cemented where is has a very smooth surface where it gets cemented to the tibia whereas we would use one with holes and a very porous looking material that would be screwed down to the bone and that would actually allow the bone to heal into the metal.

Cemented vs. Cementless replacement components

That metal-bone interface becomes a healed single unit like you would heal a fracture. So this component actually becomes part of you therefore it does not tend to loosen over time. On the femoral side, we would also use a component with a very porous ingrowth surface where your body would grow into that prosthesis.

Additionally the plastics that are used have been materially engineered to be much more durable so they don't wear out as quickly. We're thinking now that they are going to last people the rest of their life.