Triathlon

Stryker’s Triathlon is a total knee system that has over a decade of proven performance in both Australia and New Zealand, recording one of the highest published survivorship rates of all knee prostheses in the market at 96.6%²⁷ and 97.4%²² respectively after ten years.

Stryker’s knee philosophy is focused around ‘Soft Tissue Guided Motion’ where the implant respects the soft tissue envelope of the patient and works with the body rather than simply within it. This results in patients being able to experience a high flexion and high functioning knee, and quicker post-surgery recovery ².

Stryker’s ‘Soft Tissue Guided Motion’ philosophy is able to be realised through five modern design features found in the Triathlon knee system:

• Single radius
• Rotary arc
• Shortened and flared posterior condyles
• Anatomic patellofemoral track
• Reduced extension radius

Helping over 2 million patients to get around³. Triathlon’s distinction as a modern knee boasting multiple international design patents and a wealth of clinical support, offers surgeons modern advancements in motion along with confidence in implant selection⁴. That is why Triathlon design has resolutely remained unchanged for over ten years since launch.

Design backed by scientific evidence.

• Modern research revealed that the posterior condyles are circular^5,6
• Single radius geometry is apparent in over 1,000 consecutive femurs in the SOMA^™ database⁷
  
• A cadaver study demonstrated that the active flexion radius range is 10° to 110° ⁵

Designed to enable soft tissue guided motion

• Designed to reduce rotational constraint compared to other systems^8,9
• Designed to accommodate up to 20° internal and external rotation^8,10,11
• There are no design features in Triathlon that promote a particular pivot location, giving the patient’s soft tissues the ability to pivot as needed^4,12

Designed to accommodate up to 150° deep flexion¹⁰

• Shortened condyles facilitate the relaxation of the soft tissues¹³ and mitigate the need for additional tibial slope resection
• Flared condyles ensure patch contact with rotation in deep flexion^13,14

Designed to enable full extension without procedural compromise^9,15

• Prevents impingement as the knee moves into the extension arc⁹
• Accommodates +/- 10 degrees of rotation in hyperextension and extension, allowing the “screw home” mechanism⁹

Designed to mimic the native knee¹⁶

• Designed with a deepened trochlear groove to help relax the extensor mechanism, enable deep flexion, and reduce contact stresses exerted across the patella¹⁷
• Incorporates the same patellofemoral design as Duracon, which demonstrated <1% patellofemoral complication rates in multiple studies^18,19,20

Global registry data shows that the unchanged design of the Triathlon Knee has one of the lowest revision rates in the industry^10,21-26.

Hip and Knee Arthroplasty Annual Report 2016

Triathlon CR is the most used femoral prostheses in primary TKR (17.1%) in all categories - cemented, cementless and hybrid (Table KT2).

Triathlon Cumulative Percent Revision (extracted from Table KT9,10,11)²⁷:

The New Zealand Joint Registry, Fifteen Year Report

• Lowest rate of revision of the top 5 knee brands (ocys:0.43)²²
• Triathlon PS has the lowest revision of the top 5 knee brands for PS knees (ocys:0.48) ²²
• Triathlon CR revision rate is ocys: 0.42²²
• Number 1 knee implanted Jan 2009 to Dec 2015²²

Clinical Research

Harwin SF. (2013) Clinical and Patient-reported Outcomes of Primary TKA With a Single-radius Design

Harwin et al (2013) showed Triathlon survivorship with 99.7% at 7-years of follow up²⁵. Results in this study coincide with published registry data. The study also provided evidence of improved outcomes in terms of function, stability and pain.

Santiago (2013) Cruciate-Retaining vs Posterior-Substituting Inserts in Total Knee Arthroplasty

Santiago et al (2013) demonstrated a two-year survival rate greater than 98%. The study also provided evidence of improved outcomes in terms of function, motion and pain.

Scott (2014) Five-year survivorship and patient-reported outcome of the Triathlon single-radius total knee arthroplasty

Scott et al (2014) demonstrated a 5 year survivorship of 97.6% for failure for any reason, and 99.5% for aseptic loosening²⁴.

Clinical studies^2,15,28-30, orthopaedic registry results^22,31-33 and laboratory studies^9,34-36 have demonstrated the potential performance and functional benefits^10,15,37 of the Triathlon Knee System.

Other Clinical studies have also shown reduction in physiotherapy sessions², more rapid abandonment of crutches,² and less anterior knee pain^15,29 comparing single radius to multiple radius knees³⁷.

A 2013 study showed that the Triathlon knee outperformed the multiple radius knee design in level walking kinematics and kinetics³⁸ meaning that the SR design has a higher propensity to return to normal function than a multiple radius knee