Verilast Knee Technology | Florida Orthopaedic Institute
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VERILAST® Knee Technology

VERILAST® Knee Technology with Oxinium Oxidized Zirconium and XLPE

If knee replacement is in your future, VERILAST® Knee Technology from Smith & Nephew is one of the truly significant advancements in joint replacement materials in the past 20 years.

Not every knee implant is the same. VERILAST Knee Technology directly addresses one of the most commonly cited concerns associated with knee replacement implants – implant wear.

Verilast Knee

OXINIUM® – Oxidized Zirconium

If your Florida Orthopaedic Institute surgeon determines that an implant made with VERILAST technology is right for you, the femoral – or thighbone portion – of your implant will be made from OXINIUM Oxidized Zirconium – a patented and award-winning ceramicised metal alloy that Smith & Nephew spent more than a decade developing.

During manufacture, OXINIUM implants undergo a process that transforms the implant’s surface into a hard, ceramicised metal – while still retaining all of the durability of the underlying metal. In addition to being more durable than a true ceramic, this metal implant’s ceramicised surface is more than twice as hard and therefore twice as resistant to the kind of scratching that can cause a cobalt chrome implant to wear out before its time.

XLPE – Highly Cross-Linked Plastic

As remarkable as OXINIUM Oxidized Zirconium is, it is the combination of the OXINIUM material on XLPE that makes VERILAST Technology exceptional. XLPE is created by altering chemical bonds in the polyethylene used to produce the plastic insert. This process creates a tighter weave at the molecular level, reducing the amount of wear experienced when the metal component rubs against it. Perhaps the easiest way to think of it is like fabric with a higher thread count.


Verilast Knee

Initial Testing

Using an internationally accepted testing protocol, the LEGION Knee with VERILAST Technology was placed alongside identical implants made from cobalt chrome and a standard plastic liner and cobalt chrome and an XLPE liner into a sophisticated machine that continually simulates the cycle of movement required by a normal walking motion. Each cycle is equivalent to the range of movement required for an average person to take a step.

During the first phase of testing, all three implant types were placed under a load of 899 pounds, or 4.9 times the typical body weight of a knee replacement patient (185 pounds), while the machine completed 5 million cycles. The machine was then stopped, and all of the implants were carefully measured to determine how much wear had occurred to the metal and plastic components. The results from this first phase of wear testing were very encouraging.

Continued Testing

Armed with the data from the first 5 million cycles, the testing continued by “walking” the implant out to 45 million cycles – the equivalent of 30 years of an active adult’s life under typical conditions.

After a total of nearly three years of continuous laboratory wear testing, the results surpassed even the highest expectations.

After 45 million cycles, the LEGION CR Knee with VERILAST Technology showed 81% less wear – even when compared to the cobalt chrome knee that was stopped after only 5 million cycles.

Why 45 Million Cycles?

Based on scientific literature reviews, a person who undergoes knee replacement surgery at the relatively young age of 45 years old would subject the implant to between 36 and 44 million cycles over a 30-year period, depending on how active the person’s lifestyle is.

Smith & Nephew chose the high end of this range – 45 million cycles – as the simulated 30-year mark.

Ask your Florida Orthopaedic Institute surgeon is an implant made with VERILAST technology is right for you.

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