Non-Modular Constrained Condylar
The Right Track
The Optetrak® knee system’s Non-Modular Constrained (NMC) prosthesis is a solution that uncouples ligament stability from bone issues. Its unique "box" design provides the same varus/valgus constraint as a constrained condylar and greater resistance to subluxation than a posterior stabilized knee, all in a bone-sparing technique.
- Non-modular constrained condylar femoral components, in conjunction with constrained condylar inserts, restore stability to the joint without the need for stems or augments on the femoral side. Debulked anterior femoral flange reduces tension in lateral retinaculum and incidence of lateral release
- Femoral/tibial articular congruency of 0.96 reduces contact stress, improving polyethylene wear
- Enhanced spine and cam mechanism controls femoral roll-back and minimizes subluxation. Highly constrained insert limits rotational and varus/valgus freedom of femoral component in order to restore stability to the joint
- Deep, extended patellar groove reduces compressive stress and shear on patellar component during high flexion. Wide patellar groove (superior region only) provides less constraint to allow for excellent patellar tracking, and rounded corners reduce medial side overhang. Spherical, all-polyethylene patellar component allows for interchangeability and high congruence throughout range of motion. Available in either three-peg or single-peg fixation options
- Tibial trays are modular with a cemented trapezoidal stem. This tray will accept stems and/or augments for additional stability or to fill bone voids. Tibial up-sizing/down-sizing capability allows optimal bone coverage while maintaining the same excellent congruency regardless of sizing combinations. The femoral component and the polyethylene insert are a matched pair with three interchangeable tibial trays to choose from for each femoral size
- Tibial insert locking mechanism includes three design features that keep polyethylene inserts in place, minimizing the potential for backside wear. A continuous peripheral rim around the tibial tray, posterior feet that couple with precision undercuts in the tray and a central mushroom provide a barrier to insert motion and prevent lift-off. The constrained condylar polyethylene insert has a spine stiffener screw to strengthen the spine and act as an additional locking mechanism
- Tibial stem extensions may be cemented or press-fit and are available in a wide range of lengths and diameters
Optetrak® is a registered trademark of Exactech, Inc.