U2 MBC™ Knee







Mobile Bearing Congruent Rotation Platform

● High Conforming design allows Cruciate Retaining or Sacrificing
● Dual-surface articulation between a polyethylene insert and the femoral component and tibial tray improved the mobility characteristics and gait patterns
1

 


U2 CR Femoral Component
● 6 sizes (right / left), CoCrMo alloy
● Cemented / Porous type
● 4° patella groove
● Extended deep patella groove provides stable patellofemoral tracking even in high flexion
● Eliminate box cut to reduce femur fracture
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Mobile-bearing Tibial Baseplate

● 6 Sizes, CoCrMo alloy
● Cemented type
● Highly mirror-polished platform reduces the backside wear

 

 


Ultra-congruent Insert

● UHMWPE tibial insert available in 6 sizes, 5 thickness (9, 11, 13, 15, 18 mm)
● Central stopper enhances joint M/L stability and also allows 4.5 degrees hyperextension
● Higher anterior lip to prevent femoral paradoxical anterior sliding

 




Congruent Condylar Surface
Conforming inserts to increase contact area and reduce PE wear3
 




I/E Rotation
Unidirectional A/P wear pattern on the bearing surface and circular rotation on the under surface. Unidirectional motion is known to produce low wear.4
 




Component Size Pairing Table
The femoral component and the insert need to be in the same size and the mating baseplate should not be more  than one size down to avoid overhanging while rotating
 




References
  1. Sorrels et al. Midterm results of mobile-bearing total knee arthroplasty in patients younger than 65 years. Clin Orthop Relat Res. 2001; 390:182-9.
  2. Laskin et al. Deep-dish congruent tibial component use in total knee arthroplasty: a randomized prospective study. Clin Orthop Relat Res. 2000; 380:36-44.
  3. Hofmann et al. Posterior stabilization in total knee arthroplasty with use of an ultracongruent polyethylene insert. J Arthroplasty. 2000; 15:576-83.
  4. McEwen et al. Wear of fixed bearing and rotating platform mobile bearing knees subjected to high internal and external tibial rotation kinematics. J Mater Sci Mater Med. 2001; 12:1049-52.
Surgical Protocol  Brochure