Tawada with Smith & Nephew are your total solution partner in providing improved mobility and solving your orthopedic surgery needs.
Over the past 10 years the GENESIS II Knee System has grown to become one of the most trusted total knee systems on the market.
Cutting edge instrumentation, such as the user friendly MIS system and the ream-thru femoral trials, was designed to create the most comprehensive system available. GENESIS II is a member of the LEGION◊ Family of products.
Since the inception of GENESIS, we have continued to evolve.
- A deeper, more lateralized trochlear groove improves patellar contact and tracking
- An externally rotated femoral implant design optimizes femorotibial rotational alignment and reduces the likelihood of notching the lateral anterior cortex.
- Anatomically-shaped tibial baseplates have an improved fin design and significantly improve coverage of the tibia as compared to symmetrical designs. Versatile, simple instrumentation, comprehensive in function and fewer in number, reduces surgical time, makes intraoperative management easier, and provides a more precise fit.
- Thoughtful versatility reduces the number of implant components yet significantly expands your clinical options.
- Wear is reduced by improving contact area and reducing contact stress in all articular surfaces.
- All articular surfaces are polished, including the proximal tibia. A nondegrading form of sterilization is used on all polyethylene.
- Dedicated cruciate retaining, posterior stabilized, low demand, and revision systems have been designed to meet the individual needs of each clinical and economic situation.
Design Features and Materials
The primary materials used in the GENESIS II Total Knee System implant components include cobalt chromium molybdenum alloy (Co-Cr-Mo), titanium alloy (Ti-6Al-4V), and ultra-high molecular weight polyethylene (UHMWPE). These materials were chosen for their clinically proven biocompatibility and mechanical properties. The primary materials used for the GENESIS II instrumentation include 17-4 PH stainless steel and acetal copolymer. The femoral and tibial implants are offered with two different surface characteristics at the bone/cement/implant interface:
- a specially roughened surface
- a porous-coated surface
More than a decade ago, Smith & Nephew introduced OXINIUM◊ Oxidized Zirconium. This patented metal alloy is available for all of our knee implant systems. Its combination of hardness, smoothness and scratch-resistance makes it a superior choice for hip and knee implants.
OXINIUM material—a metal alloy with the surface transformed to ceramic using a patented process—has proven to be a superior metal for use in hip and knee implants due to its reduced friction and increased resistance to scratching and abrasion. These superior properties result in significantly less wear than can be produced by cobalt-chrome alloy (historically the material of choice in hip and knee implants).
Some facts that may interest you:
- OXINIUM material has a surface hardness that is over twice that of cobalt-chrome. OXINIUM material may last longer than other implants as it reduces more than half of the implant wear common to other knees and hips based on lab simulator studies.
- OXINIUM material avoids the risk of brittle fracture that can occur with ceramic implants.
- OXINIUM material is 20% lighter than cobalt-chrome.
- OXINIUM material contains <0.0035% for detectable nickel, the leading cause of negative reactions in patients with metal allergies.