Improved stability and validated outcomes

The Evolution® medial-pivot knee system is built upon a legacy of 95% patient satisfaction with 98.8% survivorship at 17 years1, and features a design that enhances quadriceps efficiency, allowing for improved proprioception.

Evolution® Medial-Pivot Knee Systems

Natural kinematics

To achieve postoperative satisfaction, patients want their implant to deliver high functionality and a more natural feeling. The single-radius design of the Evolution® knee system provides stability through all phases of flexion. AP translation is also decreased to help achieve a more normal feel. This represents a dramatic advance over traditional knee replacements, which have been shown to exhibit anterior-posterior translation that can decrease stability and cause early revisions.2,3

Surgeon insight

“The return of range of motion is much faster, they get much 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

Evolution® NitrX™ Medial-Pivot Knee System

Evolution® NitrX™ Knee System

The Evolution® NitrX™ medial-pivot knee features a titanium niobium nitride (TiNbN) coating that has been shown to reduce the release of cobalt (Co), chromium (Cr), nickel (Ni), and molybdenum (Mb) ions common in standard CoCr implants.7  The Evolution® NitrX™ knee maintains the kinematic benefits of the medial-pivot design8, resulting in optimal stability.9

medial compartment

Stable range of motion

It is routine for patients to complain of instability following a traditional knee replacement. Studies also clearly show instability to be the leading cause of early revisions.4-6 By delivering a more secure, highly conforming articulation, the Evolution® medial-pivot knee system provides the kind of stability throughout the range of motion that patients seek.


Every patient is different, and individual results will vary. There are risks and recovery times associated with surgery.

Not all products and options are available in all countries.

  • References
    1. Macheras GA et al A long term clinical outcome of the Medial Pivot Knee Arthroplasty System. Knee. 2017 Mar;24(2):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.
    4. Walker PS. Factors affecting the impingement angle of fixed- and mobile bearing total knee replacement, a laboratory study. J Arthroplasty.2007;22(5):745-52.
    5. Bindleglass DF. Current principles of design for cemented and cementless knees. Tech Orthop. 1991;6:80.
    6. Banks S. Knee motions during maximum flexion in fixed and mobile-bearing arthroplasties. Clin Orthop Relat Res. 2003;410:131-8.
    7. MPO Data on file
    8. Dennis DA, Komistek RD, Mahfouz MR, Haas BD, Stiehl JB. Multicenter determination of in vivo kinematics after total kneearthroplasty. Clin Orthop Relat Res. 2003
    9. Freeman MA, Pinskerova V. The movement of the knee studied by magnetic resonance imaging. Clin Orthop Relat Res. 2003;410:35-43