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VERILAST Technology for Knees

Partial and Total Knee Joint Replacement Surgery

Product Information


What is VERILAST Technology for Knees?


VERILAST technology is the first device to combine an OXINIUM Oxidized Zirconium femoral component with a highly crosslinked ultra-high molecular weight polyethylene (UHM-WPE) tibial insert to form an advanced TKA bearing.

• The first knee lab tested to demonstrate wear performance sufficient for 30 years of use under typical conditions*
• Offers the younger, more active patients a TKA solution designed to address their increased expectations for wear performance.
• An often used solution in total knee replacement for patients with metal sensitivity.

When used with our LEGION Total Knee System , it demonstrated an impressive 81% reduction in wear in simulated lab testing compared to conventional materials. Plus, wear simulation indicates that the LEGION Cruciate Retaining Knee System with VERILAST Technology may last up to 30 years of wear - that's twice the current industry standard of 15 years.

Learn more about LEGION Total Knee System here

*Based on in-vitro wear simulation testing, the LEGION Primary Knee System with VERILAST technology is expected to provide wear performance sufficient for 30 years of actual use under typical conditions.

The results of in-vitro wear simulation testing have not been proven to quantitatively predict clinical wear performance. Also, a reduction in total polyethylene wear volume or wear rate alone may not result in an improved clinical outcome as wear particle size and morphology are also critical factors in the evaluation of the potential for wear mediated osteolysis and associated aseptic implant loosening. Particle size and morphology were not evaluated as part of the testing.

Clinical Evidence


VERILAST Clinical Evidence

 

30 year wear performance of LEGION Primary knees with VERILAST Technology,

 

The purpose of this paper is to discuss the testing that was done to support the belief that VERILAST Technology used in the LEGION Primary knees may provide wear performance sufficient for 30 years of use under typical conditions in vivo.*

 

* Based on in-vitro wear simulation testing, the LEGION Primary Knee System with VERILAST technology is expected to provide wear performance sufficient for 30 years of actual use under typical conditions.

The results of in-vitro wear simulation testing have not been proven to quantitatively predict clinical wear performance. Also, a reduction in total polyethylene wear volume or wear rate alone may not result in an improved clinical outcome as wear particle size and morphology are also critical factors in the evaluation of the potential for wear mediated osteolysis and associated aseptic implant loosening. Particle size and morphology were not evaluated as part of the testing.
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Download the VERILAST Knee Long Term Wear White Paper

 

 

 

VERILAST 2010 Wear-Reduction History White Paper

 

History of Wear-Reduction Technology in Total Knee Arthroplasty

To reduce the number of TKA revisions, sustainable improvements in the longevity of total knee arthroplasty require a system-wide approach of optimizing the design along with using advanced bearings. VERILAST Technology in the LEGION Primary Knee System is the only TKA solution available that has United States and European Union claims for expected wear performance that is sufficient for 30 years of actual use under typical conditions

Download the VERILAST 2010 Wear-Reduction History White Paper

 

 

 

VERILAST - An Advanced Bearing System for TKA

White Paper
Morrison, Mark, PhD.; Parikh, Amit, BS; Jani, Shilesh, MS

 

Implant design and materials selection play an important role in the wear-related performance of TKA. It is widely recognized that excessive wear of UHMWPE tibial inserts can result in mechanical implant instability and, in some instances, catastrophic wear.

Download the Advanced Bearing System for TKA White Paper

 

 

 

 

Design


Every TKA implant is composed of two bearing surfaces:
1. Polymeric tibial component
2. Hard femoral component.


Previous attempts to improve wear resistance only involved the polymeric tibial component, but both components affect the wear performance of the couple. Ceramics have shown superior wear in hips 25, and Smith & Nephew is the only company that can provide a ceramic bearing surface for TKA. By improving both bearing components, we created a system-wide solution with industry-leading wear resistance. The result? VERILAST Technology, the only advanced bearing couple for TKA, which features OXINIUM* Oxidized Zirconium femoral components used in conjunction with 7.5 Mrad highly crosslinked, re-melted UHMWPE tibial inserts.


VERILAST technology combines Cross Linked Polyethylene with our OXINIUM Technology which has been proven to be twice as hard as CoCr but 49 times more abrasive resistant than CoCr, which reduces wear in both pristine and roughened conditions.


Smith & Nephew XLPE for TKA is manufactured from compression molded GUR 1020, and is gamma - irradiated at 7.5Mrad and subsequently re-melted. It has been proven to balance significant wear reduction but also maintains mechanical properties. We have done this with our high flex designs, which minimize the potential for sheer forces.

 

 

For more detailed information, contact your local sales representative.