U2 PSA™ Knee

Revision Knee System

The U2 PSA Knee™, designed by the United Orthopedic Corporation (UOC), is a complete range of 1st line treatment PTGs: Fixed and mobile CR, fixed and mobile PS, and PSA revision with constrained insert.

The fixed tibial baseplate is commonly used in fixed cruciate-retaining (U2 CMA™) and posterior stabilised (U2 PS™) fixed inserts.

The mobile tibial baseplate is commonly used in cruciate-retaining (U2 MBC™) and posterior stabilised (U2 MB™) mobile inserts

DescriptionPSA femurBlocs and TibiasFemur / Tibia ConnectionInsertPatella
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Description

The PTG U2 PSA™ is a fixed-bearing femoral revision prosthesis with a fixed PS constrained insert.

The PSA femur has a multi-radius design with a “patella friendly” trochlear groove that promotes flexion and stability.

The femoral component and the tibial baseplate require the insertion of pins and enable the use of wedges.

The U2 Knee™ System provides the option of mixing a 1st line treatment CR or PS femur with a PSA tibia.

PSA femur

  • 6 sizes for the right and left

  • CrCoMo cementing version
  • Multi-radius design based on the range of U2 femurs
  • The deep and wide trochlear groove at a 4° valgus angle promotes stable patellar rolling of a natural or prosthetic patella
  • Flexion of up to 134° possible

    • Identical cage width for all sizes
    • Locking screw for locking the stem

Femoral wedges


  • CrCo alloy
  • Posterior: 4 and 8 mm thick
  • Distal: 4, 8, 12 and 16 mm thick

Tibia

  • 6 symmetrical sizes
  • Titanium alloy for cementing (TiAl6V4)
  • Locking screw for locking in the insert/stem

Tibial wedges



  • Titanium half-wedges
  • Thickness: 5, 10 and 15 mm
  • With fixing screw

Extension stems for femur/tibia

  • Uncemented titanium alloy
  • Ø 10 to 20 mm
  • Straight stems 30, 75, 100, 150 and 200 mm in length

  • Curved stems 150, 200 mm in length

Femur/Tibia offset adapter

  • Titanium alloy
  • 2, 4 and 6 mm offset

Insert

  • 6 symmetrical sizes
  • Thickness: 9, 11, 13, 15, 18, 21 and 25 mm
  • Locking screw for locking in the insert/stem

Constrained design to improve stability

  • Flexion of up to 134°
  • I/E rotation +/- 3.7° (close to natural knee)
  • Varus-valgus constrained +/- 1.4°
  • Optimised congruence to reduce wear: 30/32 radius
  • Early post-cam engagement from 40°
  • Significant cam height before dislocation: 21.4 mm

Compatibility of the U2 range

Patella

  • surface
  • embedded

USTAR IIU2 PSA