![]() Harato K, Bourne RB, Victor J, Snyder M, Hart J, Ries MD.Can high-flexion tibial inserts improve range of motion after posterior cruciate-retaining total knee arthroplasty?Orthopedics. The revision rate in this report was 2.4% at 5 years (2.0 to 2.9%). In the 7 th UK National Joint Registry report, the Genesis 2 had 7% of the primary knee replacement and 5% of the revision market, and was growing in popularity. This device has found favour with patients who have a known nickel sensitivity as the nickel content is very low. The Genesis II knee is also available in Oxinium ™, which is zirconium, oxidised in such a way that the surface becomes a ceramic, is therefore smoother and is associated with lower in vitro wear rates. There are standard and minimal access instruments available. The standard femoral implant is manufactured in cobalt chrome - the tibial tray is polished titanium, and the polyethylene locks using a dovetail mechanism. Recent studies have suggested the deep flexion tibial insert (with a lower posterior margin to facilitate rollback) was associated with higher flexion than standard inserts (around 7 degrees more)(Crow 2010), but factors including BMI and preoperative flexion are likely to be more important (Harato 2008, McCalden 2009, 2010, Zeh 2010). High flexion knee and deep-dished tibial inserts are available, as is an all-polyethylene tibia in cruciate retaining or posterior stabilized versions. The system is said to allow compatibility between a femoral component of a given size and up to four sizes of tibia.Īvailable versions include cruciate retaining, posterior stabilized, and constrained arthroplasties. The features of this device include a deeper and more lateralized trochlear groove than earlier designs, an externally rotated femoral component (meaning the femoral cuts are performed in neutral rotation relative to the epicondylar axis, but the implant has a thicker posterolateral femoral condyle to compensate) and an anatomic asymmetrical tibia. The Genesis II Total Knee System is a cemented primary and revision knee replacement system from Smith and Nephew, implanted since the 1990s. ![]()
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