U2 Knee System

Fixed Bearing

U2 Knee PS

Product Overview

The U2 Knee™ System, was designed by the UNITED ORTHOPEDIC CORPORATION (United) with the goal of addressing the clinical requirements of patients and surgeons, around the world. Our research and development efforts have focused on a comprehensive review of the contemporary state of the art, an observance of time proven performance and design elements of total knee systems.

The U2 Knee™ System options include:

U2 Knee™ CR Cruciate Retaining Knee Replacement
U2 Knee™ PS Posterior Stabilised Knee Replacement
U2 Knee™ Mobile Bearing (MBC/MB) Knee Replacement
U2 Knee™ PSA Revision Knee Replacement

The U2 Knee™ System is a comprehensive system designed to allow surgeons to address straightforward primary to complex revision knee arthroplasty. With its cutting-edge instrumentation, such as the user friendly AIO block and the Modular Disposable trials (MDT) the U2 Knee™ System is designed to be a state-of-the-art knee system.

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Description CR femur PS Femur Fixed tibia Fixed insert Patella

Description

The U2 Knee™ System is available in a wide range of sizes, offering uncompromising intraoperative flexibility and full interchangeability of femoral, tibial and patellar components.

Among the major features of the U2 Knee design are:

• A science-based size range for improved implant fit and associated capsular/soft tissue interactions
• An interchangeable round-on-round femorotibial articulation for enhanced load distributions
and improve wear characteristics
• High Compression Molded UHMWPE for enhanced wear performance
• A refined PS Progressive Rollback Post and Cam mechanism to provide more effective anatomic
rollback behaviour for improved ROM potentials
• An improved Post and Cam jumping distance to reduce dislocation potential
• An increased posterior condylar lobe thickness to provide important curvature continuation to
encourage ROM and minimize bone/implant impingement potentials in deep flexion
• A multi radius femoral component curvature to encourage physiologic ligament tension relationships

CR femur

The PS (posterior stabilized) and CR (curciate retaining) femoral components have the same design features, including 2 mm A/P and M/L increments, extended patella groove, and consistent intercondylar width.

The extended patella groove is designed with increased contact area between the patella and femoral implants to allow for optimal patella tracking.

Two CR femoral component types are available – CR (Cemented type) and CR Porous (Sintered CoCr bead)
Section 14 sizes right and left

PS Femur

The PS (posterior stabilized) and CR (cruciate retaining) femoral components have the same design features, including 2 mm A/P and M/L increments, extended patella groove, and consistent intercondylar width.

Consistent condylar curvature and standard intercondylar box width (in PS knee) allows full interchangeability between femoral and tibial components.

Smaller intercondylar bone removal together with rounded corners help avoid the risk of intercondylar fracture for PS box preparation.

Fixed tibia

7 symmetrical sizes
Titanium alloy for cementing (TiAl6V4)
Possibility of retaining or sacrificing PCL
Smooth surface without holes to eliminate wear of the wedge screws

3 versions: monobloc (CM), modular (CMA) and modular non-cemented

CM monobloc	CMA modular	modular non-cemented

Modular version with pin and wedges (CMA)


30 mm length	5 mm and 10 mm thickness

Fixed insert

5° posterior slope induced in the insert

Thickness: 9, 11, 13, 15 and 18 mm
CR, PS and XUC versions (ultra-congruent)
Vitamin E Highly Crosslinked Polyethylene

Ultra-congruent XPE

Promotes stability and limits counterintuitive movement
Increases contact area and reduces PE wear
Anterior lip prevents subluxation

Extraordinary Wear Performance
E-XPE insert shows 60% reduction in gravimetric wear compared to XPE after accelerated aging

Enhanced Mechanical Strength
Heat treatment is not required after cross- linking process. Therefore, E-XPE shows a 20% tensile strength improvement as compared to highly cross-linked polyethylene

Superior Oxidative Stability
Surface oxidative index of E-XPE shows significant low oxidation after in vitro accelerated aging test

Patella

surface

embedded