Triathlon® Knee System

Knee Implants That Promote Easier Motion1,2,3

Stryker knee replacements are different than traditional knee replacements because they are designed to work with the body to promote easier motion,1,2,3 and a study has shown a more rapid return to functional activities after surgery.2 This is due to the single radius design of the knee implant. Single radius means that as your knee flexes, the radius is the same, similar to a circle, requiring less effort from your quadriceps muscle.1,4,7

Because the thigh muscle (the quadriceps) is attached to your knee, it is unavoidably involved in the surgery. Therefore, the quadriceps muscle can become a source of discomfort or pain during your recovery period. The quadriceps muscle plays an important role in your ability to move your legs so it also has a major impact on your recovery and how quickly you can get back to living your life.2

Knee Implants Designed to Last Longer5

Several factors influence how long an implant will continue to perform. Stryker knees are designed to resist wear in many ways — they use advanced bearing surfaces; they're balanced to help avoid excessive stress in any one spot; and, they're sized to better fit your personal anatomy.

The durability of knee implants depends on many things including patient weight and activity level, as well as the implant's bearing surface technology. The bearing surface is defined as the two parts of the knee that glide together throughout motion. Stryker developed the Triathlon Knee System with X3 Advanced Bearing technology. Based on laboratory testing, Stryker's Triathlon Knee with X3 technology has demonstrated a lower wear rate which may result in a longer lasting implant.5 X3 is a patented technology only offered by Stryker.

Better Results in Knee Replacement6

The Triathlon Knee has Better Results than other knee implants when measuring revision rates on the National Joint Registry of England and Wales.6 Let's take a look at how Stryker's Triathlon Knee with X3 technology compares to other knee implants.

Stryker Corporation or its divisions or other corporate affiliated entities own, use or have applied for the following trademarks or service marks: Stryker, Triathlon, X3. All other trademarks are trademarks of their respective owners or holders.


1. Ostermeier, S; Stukenborg-Colsman, C, Hannover Medical School (MHH) Hannover, Germany "Quadriceps force after TKA – a comparison between single and multiple radius designs", Poster No. 2060 • 56th Annual Meeting of the Orthopaedic Research Society.
2. Harwin, S.F., Hitt, K, Greene, K.A. Early Experience with a New Total Knee Implant: Maximizing Range of Motion and Function with Gender-Specific Sizing Orthopedic Surgery, Surgical Technology International, XVI. pgs 1-7.
3. Greene, K.A. Range of Motion: Early Results from the Triathlon® Knee System, Stryker Literature Ref #LSA56., 2005.
4.Wang, H., Simpson, K.J., Ferrary M.S., Chamnongkich, S., Kinsey, T, Mahoney, O.M., Biomechanical Differences Exhibited During Sit-To-Stand Between Total Knee Arthroplasty Designs of Varying Radii, JOA, Vol. 21, No. 8, 2006.
5. Stryker Orthopaedics Test Report: 06-013.
6. The National Joint Registry of England and Wales. Annual Report 2010. Table 3.11 Based on mean Revision Rates at three years according to brands for knee replacement procedures undertaken between 1st April 2003 and 31st December 2009, which were linked to a HES/PEDW episode.
7. The effect of total knee arthroplasty design on extensor mechanism function, JOA, Vol. 17, Issue 4, June 2002, pp. 416-421.