U2 Knee™ System

U2 Knee System

Overview

With its 155-degree high-flexion design and unique bone preserving properties, the award-winning U2 Knee™ system is ideal for reducing or relieving pain and/or improving knee function in skeletally mature patients who suffer from: rheumatoid arthritis, osteoarthritis, primary and secondary traumatic arthritis, avascular necrosis of the femoral condyle, and other debilitating conditions. Innovative instrument set also supports minimally invasive surgical techniques, and offers predictable accuracy and precision during implant preparation and placement.

Includes: cementless porous CR and cemented CR & PS components, Ti forged baseplate, XPE tibial and patellar components.

U2 Knee™ system and instrument sets are designed and manufactured exclusively by United Orthopedic Corporation.

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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. Notable design features include:

  • 155° high-flexion design1 (included PS and CR designs) — ensures sufficient range of motion2 to help patients perform daily-living activities.
    U2 Knee System
  • 15.5 mm jumping distance (tibiofemoral joint) — enhances joint stability and helps prevent dislocation.
    U2 Knee System
  • Lower femoral cam/insert-post contact point — designed to reduce the risk of post-related fracture.
    U2 Knee System
  • XPE tibial and patellar insert system — increases implant longevity and reduces wear resistance up to 76%, compared with standard UHMWPE inserts.
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  • Bone-saving femoral box (PS only) — minimizes anterior femoral bone cutting and maximizes bone-stock preservation, helping to prevent distal condylar fractures.
    U2 Knee System
  • Optimal curve-on-curve2 of tibiofemoral joint in the coronal plane — supports natural kinematic movement, resists delamination and wear, and provides interchangeability between femoral and tibial components.
    U2 Knee System
  • Multi-radius in the sagittal plane (femoral component) — features a longer lever arm that enhances quadriceps efficiency and improves joint stability during deep-knee flexion.
    U2 Knee System
  • Deeper and extended patellar groove (femoral component) — provides smooth, stable patellar tracking and prevents patellar subluxation; also maximizes contact with the patella-femoral joint during flexion to minimize implant wear and prevent anterior knee pain.
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  • Consistent 18 mm of PS Intercondylar notch — provides full interchangeability between femoral and tibial sizes and preserve more bone stock.
    U2 Knee System

Prosthetic Materials and Design

Femoral component: Cast CoCrMo alloy; available in Cruciate Retaining (CR) design-with or without porous coating-and Posterior Stabilized (PS) design.
Tibial baseplate: Forged Ti6Al4V alloy; full-capture locking mechanism with maximum bone coverage.
Tibial insert: Conventional PE and X-linked PE; CR and PS designs for precise matching with femoral components.
Patellar component: Traditional PE and X-linked PE; dome shaped with onset and inlay designs.


1 Based on independent test report from EndoLab; completed at January 12, 2013.
2 Sathasivam and Walker: The conflicting requirements of laxity and conformity in total knee replacement. J. Biomech. 32: 239-247, 1999.

System Components

Thoughtful, surgeon-friendly design and modular, space-saving trays help reduce patients' time under anesthesia by making instrument identification and access quick and easy; only three trays are needed for CR or PS procedures. The design also reduces space needed in the OR and facilitates efficient, effective in-hospital instrument processing. Essential components of the U2 Knee™ System Instrument Set include:

  • Anterior Reference System — to accurately position anterior flange blending
    U2 Knee System
  • Distal Femoral Valgus cutting guide — denoted in precise, one-degree increments
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  • PS Notch Cutting Guide — with powered Reamer and Osteotomes for precise preparation
    U2 Knee System
  • Intramedullary and Extramedullary — Tibial Alignment Guide Options
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  • Inset and Onset Patellar Cutting Guide — Options to accurately prepare and restore patellar thickness
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  • MIS (Minimally Invasive Surgery) — option includes: a patented Distal Femoral Cutting Guide and a Femoral Sizing Caliper.
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  • Other Features
    • Femoral/Tibial Spacer Blocks to allow assessment of the flexion and extension gap balance
    • Four compact sterilization trays to provide efficient instrument handling