What makes the Evolution® medial-pivot knee implant different?

Traditional implants with a rotating hinge design only swing back and forth, and also are shown to decrease stability by sliding forward during everyday activities.2-3 But a normal knee pivots on its inner (medial) side. And when the knee bends, the outer (lateral) side rolls back, while the medial side rotates in one place. This is precisely how the Evolution

Knee implant was designed to move, and how it received its name – by replicating the bending, rotating and twisting of a healthy knee. This ball-in-socket design maximizes stability throughout range of motion, and allows patients to walk down stairs, and complete other daily activities with confidence.

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Survivorship at 17 years


95% 1

Patient satisfaction

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Implanted to date

Surgeon insight

“The return of range of motion is much faster, they get better motion, and they get it quicker. They're out of the hospital sooner, their pain is better, and they seem to get back to the activities that they want to do at a much quicker rate.”

- Dr. Joseph Assini MD, Englewood, CO

Promotes natural knee movement

“All the designs today are very good. Why is this design better than another designs? The reason why I think this design is better is because I think it truly reproduces the normal kinematics of a knee, with having the stability of the Medial-Pivot design.”

- Dr. Andrew Ajluni MD, Detroit, MI

What surgeons are saying about the Evolution® medial-pivot knee

“There's no question that the knee just feels more stable to them. The activities that they do, when they're hiking and going up and down stairs and steps, those day-to-day functions tend to be more stable and feel more natural when using the medial pivot knee.”

- Dr. Joseph Assini MD, Englewood, CO

“What I'm finding is that, early on, the patients seem to recover quicker, and they seem to have a more normal knee in terms of their kinematics, they walk more normally.”

- Dr. David Backstein MD, Toronto, ON

“The 25 year anniversary for the Medial-Pivot Knee is basically a validation that this new technology is actually effective, and has longevity. It's proven itself over 25 years.”

- Dr. David Backstein MD, Toronto, ON

“The Medial-Pivot design really replicates the normal knee when compared to all other designs on the market, and this really gives us that greater stability.”

- Dr. Joost Lagast, Gent, Belgium

"The advantage of the Medial-Pivot Knee lies in its ability to mimic the kinematics of a healthy knee. It’s as simple as this! All of the surrounding soft tissue of the knee is adapted to a specific sequence of movements. If you keep it that way, the knee works well.”

- Dr. Matthias Schmied MD, Switzerland

“The Medial-Pivot Knee is such a unique knee by design.”

- Dr. Russell Nevins, Las Vegas, NV

Surgeon resources

Five Things You should Ask your hip surgeon

Five things to ask your knee surgeon

Five Things You should Ask your hip surgeon

Knee replacement FAQ


Every patient is different, and individual results will vary. There are risks and recovery times associated with surgery. Consult your doctor to determine if joint replacement surgery is right for you.

Individual results and activity levels after surgery vary and depend on many factors including age, weight and prior activity level. There are risks and recovery times associated with surgery and there are certain individuals who should not undergo surgery. Please click here to read about risks associated with surgery. Only a physician can tell you if this product and associated procedure are right for you and your unique circumstances. Please consult with a physician for complete information regarding benefits, risks and possible outcomes.

These surgeons are paid consultants for MicroPort Orthopedics. The opinions expressed are theirs alone and do not necessarily reflect the opinions of MicroPort Orthopedics Inc.

  • References
    1. Macheras, G.A.; Galanakos, S.P.; Leptsos, P.; Anastasopoulos, P.P.; Papadakis, S. A. A long term clinical outcome of the Medial Pivot Knee Arthroplasty System. The Knee 24 (2017): 447-453
    2. Dennis DA, Komistek RD, Mahfouz MR, Haas BD, Stiehl JB. Multicenter determination of in vivo kinematics after total knee arthroplasty. Clin Orthop Relat Res. 2003
    3. Schmidt R, Komistek RD, Blaha JD, Penenberg BL, Maloney WJ. Fluoroscopic analyses of cruciate-retaining and medial pivot knee implants. Nov;(416):37-57.