Computer Design is utilized to advance Total Knee Replacement Surgery. Patient specific anatomic data derived from MRI scans and long standing knee xrays are used to fabricate custom surgical instruments (cutting blocks). The custom blocks (see photo) are applied to the patient's bones for Patient Matched Total Knee Replacement, which precisely sizes and positions the knee components. This represents an improvement on Computer Navigated Surgery because the computer is now being used prior to surgery to pre plan the bone resection using a three dimensional model. This results in placement and sizing of the total knee specifically for each patient. The surgery is customized and the placement of the knee components are precise. This Patient Matched technology is only available at limited locations in the U.S. (Dr. Tarlow is authorized to use this technology at Scottsdale Thompson Peak).
This Smith and Nephew technology may be superior to the Otis Med technique because the Patient Matched Total Knee Replacement restores the knee to the "gold standard" neutral mechanical axis (straightens deformed legs).
Patient benefits with the Patient Matched Total Knee Replacement include MIS (minimally invasive surgery) techniques, reduced operative and anesthesia time, shorter hospitalization, and speedier recovery.
The Journey Knee design is the first and only of it's kind. Designed from the ground up from a clean slate by a team of engineers, knee rotation, translation and flexion are restored to near normal parameters. Modern design tools created a knee with unique design features resulting in superior stability, strength and flexion. Patients remark the Journey knee provides better knee motion and feels more like a normal knee compared to other knee designs.
The use of Oxinium as the metal for the Journey knee further improves the Patient Matched Total Knee, making this ideal for the younger and more active patient. Oxinium is a metal with a ceramic surface that has outstanding wear resistance. Oxinium, with it's superior wear characteristics, may be a superior material for Total Knee Replacement in the younger, active patient.
Wednesday, October 8, 2008
Patient Matched Total Knee Replacement - The Next Great Thing for Knee Replacement Surgery
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4 comments:
My mother had a total knee on her left leg using regular technology and 2 years later had an Otisknee on her right leg 3 months ago, and she said it was night and day. She didn't need a cane for more than a week, and was gardening in 2 months. Not sure what the smith nephew thing is, but the Otisknee was the best thing that ever happened to her.
Norah,
The Smith and Nephew "thing" is an updated version of the Otis Med concept. In my opinion the Smith and Nephew Patient Matched technique improves on the Otis Med by precisely straightening the arthritic knee. The Patient Matched technique can also be used with the Oxinium Journey Knee which may be a longer lasting component specifically for younger, active patients.
My wife had both of her knees replaced in Scottsdale and they were replaced with the rotating platform knee and a computer was used on both knees. She is back to skiing, golf and hiking and she claims her new knees are better than her old knees. Now I need to have my knee replaced and I, also, would like the rotating platform knee. Can you use the Patient Matched Total Knee Replacement you speak of with the rotating platform knee? My doctor says that ceramic surfaces "squeek" inside the body.
Blogger Stefan D. Tarlow MD said...
MNSnowbird,
Rotating platform model is not an option with Patient Matched knees. There are no squeak issues associated with knee replacements. I believe the issue was with ceramic on ceramic hips only, with a low frequency of 0.4 % in models with a poor design leading to metal contamination of the bearing area. The Smith and Nephew Journey knee is a ceramic on polyethylene, squeaking is impossible. This knee flexes, rotates and translates without having to use the rotating bearing design.
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