Product presentation The LEXA total knee prosthesis, with rotating hinge, was designed for both surgical revision and primary osteoarthritis of the knee, relating to :
- Major axial deviation
- Major laxity
- Extreme stiffness
Quality functional recovery is achieved rapidly, and these indications can be extended to more simple cases of osteoarthritis of the knee in elderly subjects. Desarthrodesis is also possible, and problems caused by related metaphyseal pathologies and abnormal diaphyseal curvature can be resolved.
Details
The metal/metal rotation and flexion axes without polyethylene bearing avoid wear which would otherwise cause the release of polyethylene particles, and reduce functional clearance.
Reduced axial rotation through the first degrees of flexion prevents patella engagement failure and reduces stress on the stems and axes.
Permanent load-bearing of the condyles on the tibial plateau, regardless of the rotation position, absorbs a large part of the stress.
The absence of cam effect during rotation between the implants prevents dislocation of the central pivot.
All femoral components and tibial trays can be combined; however, the bearing should be the same size as the femoral component.
Femoral component
Made of cobalt chromium alloy and available in 3 left-right anatomical sizes, cemented.
Posterior and distal hemiwedges available in 2 thicknesses for screw-fitting to the femoral component.
Mobile bearing
Made of ultra high molecular weight polyethylene (UHMWPE), it comes vacuum packed in 3 sizes.
It can be attached to the tray using a safe clip system secured by a screw mounted on the bearing.
Tibial tray
Made of cobalt chromium alloy, comes in 3 sizes, cemented.
Tibial wedge thicknesses available for all tray sizes, screw-fixed.
Patella component
Made of ultra high molecular weight polyethylene (UHMWPE) and vacuum-packed.
Available in 3 sizes to suit 3 femoral component sizes.
Its part-sphere design cut according to an oval contour enables better adjustment to the edge of the patella section.
