Learn more about the knee implants your surgeon may use

Ask your surgeon for more details

Your surgeon can provide you with information on the knee replacement they feel is best suited to your situation, should surgery be an option for you.
If your surgeon uses Stryker products, ask them for a login to the Stryker Online Patient Resources, where you can learn more about the knee implant you may receive, what to expect during surgery, and what rehabilitation exercises you can do during your recovery. 

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Knee implant designs

Triathlon® Knee System

The Triathlon® knee offered by Stryker is one of the most commonly implanted knee replacements in Australia (Table KT1).1 Over one million patients globally have already received a Triathlon knee system since 2004.

Triathlon lasts. Many joints last 10 to 20 years or more, but joints do wear over time and sometimes need to be replaced. Triathlon has a lower risk of replacement compared with standard joint replacements. 2

The Triathlon knee philosophy designed is to mimic natural knee motion, thereby enhancing stability and mobility in activities such as going up and down stairs and gardening. Triathlon’s single-radius design is intended to work with the body to promote natural circular-like motion. 3-5 A single -radius design means that as your knee flexes, the radius is circular and is similar to your natural knee, thereby potentially requiring less effort from your quadriceps muscle and improved function following your knee replacement. 6

The Triathlon knee femoral and tibia components are manufactured from Cobalt Chromium Alloy, a material that has over 70 year’s history of use in the manufacture of surgical implants for its high degree of compatibility and strength within the body.

The Triathlon knee is designed to resist wear by using advanced bearing surfaces. 7 The bearing surface is the place where the two parts of the knee glide together throughout motion. X3®, the bearing surface technology in the Triathlon has demonstrated a lower wear rate in laboratory testing, which may result in a longer-lasting implant. 7

  1. Australian Orthopaedic Association National Joint Replacement Registry. Annual Report. Adelaide; AOA; 2013
  2. English & Wales National Joint Registry, Swedish Knee Arthroplasty Register
  3. Wang H, Simpson KJ, Ferrara MS, Chamnongkich S, Kinsey T, Mahoney, OM. Biomechanical differences exhibited during sit-to-stand between total knee arthroplasty designs of varying radii. J Arthroplasty. 2006;21(8):1193-1199.
  4. Designed to maintain collateral ligament stability throughout the range of motion. Stryker-Initiated Dynamic Computer Simulations of Passive ROM and Oxford Rig Test, Stephen Piazza, 2003.
  5. Gómez-Barrena E, Fernandez-García C, Fernandez-Bravo A, Cutillas-Ruiz R, Bermejo-Fernandez G. Functional performance with a single-radius femoral design total knee arthroplasty. Clin Orthop Relat Res. 2010;468(5):1214-1220.
  6. Ostermeier S, Stukenborg-Colsman C. Quadriceps force after TKA with femoral single radius. Acta Orthop. 2011;82(3):339-343.
  7. Stryker Orthopaedics Test Report: RD-06-013.


The RESTORISTM family of partial knee implants are specifically designed for Stryker's Robotic-Arm Assisted SurgeryTM procedures, which enable the treatment of one or two compartments of the osteoarthritic knee.

RESTORISTM MCK Multicompartmental Knee System offers an alternative solution for patients suffering osteoarthritis in one or more compartments of the knee - medial, patellofemoral, lateral, or bicompartmental. As such, the RESTORISTM MCK system consists of a femoral, patellofemoral, and tibial component. This partial knee replacement system has been designed to off several potential benefits to patients, including enhanced patient mobility, and may result in quicker recoveries and shorter hospital stays.1, 2, 3, 4 ,5 All joints do wear over time and sometimes need to be replaced, but RESTORISTM has been designed for longevity.6 Each patient will experience a different post-operative activity level, depending on their own individual clinical factors.

Clinical References
  1. Yildirim G, Fernandez-Madrid I, Schwarzkopf R, Walker PS, Karia R. Comparison of robot surgery modular and total knee arthroplasty kinematics. J Knee Surg. 2014 Apr: 27(2): 157-63.
  2. Watanabe T, Banks SA, Kreuzer S, Leffers K, Muneta T, Conditt MA, Jones J. Deep flexion kinematics with robotic modular knee arthroplasty. 24th Annual Congress of the International Society for Technology in Arthroplasty (ISTA), 2011, Bruges, Belgium.
  3. Kreuzer S, Pourmoghaddam A, Dalal S, Jones J, Conditt M. Functional Recovery after Bicompartmental Arthroplasty, Navigated TKA and Traditional TKA. 25th Annual Congress of ISTA, October 3-6, 2012, Sydney, Australia.
  4. Augart M, Plate JF, Seyler TM, Von Thaer S, Allen J, Sun D, Poehling GG, Jinnah FH. Improving Outcomes of Lateral UKA with Robotic-Assisted Surgery. 26th Annual Congress of ISTA, October 16-19, 2013, Palm Beach, FL.
  5. Koskinen E, Eskelinen A, Paavolainen P, Pulkkinen P, Remes V. Comparison of survival and cost-effectiveness between unicondylar arthoplasty and total knee arthoplasty in patients with primary osteoarthritis: a follow-up study of 50, 493 knee replacements from the Finnish Arthoplasty Register. Acta Orthop. 2008 Aug: 79(4): 499-507.
  6. Coon T, Roche M, Peale A, Dounchis J, Borus T, Buechel F Jr. Two Year Survivorship of Robotically Guided Unicompartmental Knee Arthoplasty. 26th Annual Congress of ISTA, October 16-19, 2013, Palm Beach, FL.






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Why use Stryker implants?

Why use Stryker implants?

Knee implants to promote easier motion

If your quadriceps need to make less effort, motion is much easier. So, unlike traditional knee replacements, Stryker knee replacements are designed to work with the body to promote easier motion.

A study has shown a more rapid return to functional activities after surgery,2 due to the single radius design of the knee implant. This 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

As the thigh muscle (the quadricep) is attached to your knee, it is unavoidably involved in surgery and can become a source of discomfort or pain during your recovery period. This 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 longer

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 designed 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 your weight and activity level, as well as the implant's bearing surface technology. The ‘bearing surface’ is 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.X3 is a patented technology only offered by Stryker. 8


Proven better results

Stryker’s Triathlon Knee had better results than other knee implants when measuring revision rates (the need to do a second surgery to resolve issues) on the National Joint Registry of England and Wales.6

Revision Rates for the Most Frequently Used Brands

  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: RD-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/PEDWepisode.
  7. The effect of total knee arthroplasty design on extensor mechanism function, JOA, Vol. 17, Issue 4, June 2002, pp. 416-421.
  8. US Patent #7,714,036
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.
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Next Steps

Contact your GP or health professional to discuss your options