NexGen® Complete Knee Solution Cruciate Retaining Augmentable (CRA)

The NexGen CRA Femoral Component is intended for patients who, in the surgeon's judgement, have adequate mediolateral, anteroposterior, and varus/valgus ligament stability, yet require augmentation and/or stem extensions due to inadequate bone stock. The NexGen CRA Femoral Component is available with a PMMA precoat surface. This device is for cemented use only.

Different Radii of Curvature in the Sagittal Plane

NexGen CRA Knee Replacement

A symmetric femoral radii (the lateral condyle radius is larger than the medial) aid natural rotation/rollback, working in concert with the soft tissues.





























Distinctive Net-Shape Compression-Molded Polyethylene Micro-Finish ™

Surface Finish smoothness and reproducible dimensional consistency result from this manufacturing process. Polyethylene with no added calcium stearate gamma irradiated in an inert nitrogen environment, helps to minimize oxidation and maintain the material's durability or abrasion resistance.

Modular Femoral and Tibial Augments

In multiple thicknesses and shapes provide options to manage bone loss.

Anterior Flange Thickness

The minimized width and thickness of the anterior femoral flange helps to relieve tension on the extensor mechanism and restore normal joint function.

Distinctive Zimaloy® Cobalt-Chromium-Molybdenum Alloy

Femoral components are made from Zimaloy alloy, a time-tested material known for excellent wear characteristics and corrosion resistance.

CR Articular Surface Options

The surfaces are available in three styles; Standard, Anterior Constrained (AC) for enhanced A/P stability, and Anatormically Rotated (AR) with 6 degrees of external rotation built into the proximal surface.



















































Tibial Options

Stemmed components are available with porous fiber metal, precoat, and non-coated surface versions. All tibial components are for cemented use only.

Stemmed Tibial Base Plate

The NexGen stem base is designed to resist base plate lift-off due to tilting that can result from poor bone stock.1 Two stem base designs are available. Porous, fiber metal precoat, and option fixation surfaces are also available.

Offset Stem

Zimmer designers and a team of world-class physicians combined their respective talents to bring you the NexGen Complete Knee Solution - solutions that consist of physician and patient-specific products and technologies. Distinctive fixation-enhancing technologies such as cobalt/chrome- and titanium-fiber metal and PMMA precoating offer surgeons a true choice. The issue of wear is managed with our Net-Shape compression-molded polyethylene, a time-tested, durable, and abrasion resistant material with a Micro-Finish surface smoothness. For patients whose canal is not centered relative to the distal femur or proximal tibial surface, a 4.5mm adjustment is available with Zimmer's patented offset stem - another patient-specific, Zimmer distinctive.












References

1. Walker PS, Greene D, Reilly D, et al. Fixation of tibial components of knee prostheses. J Bone Joint Surg. 1981;63-A:258-267