U2 PSA™ Knee

Revision Knee System

Product overview

The U2 PSA Knee™, designed by the United Orthopedic Corporation (UOC), is a complete range of 1^st 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

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Description PSA femur Blocs and Tibias Femur / Tibia Connection Insert Patella

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

U2 PSA USTAR II

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