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Semelhante a Briard Jl. Are All Mb Knees The Same. Slide 29 53
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Briard Jl. Are All Mb Knees The Same. Slide 29 53
- 4. Lab. Studies in Leeds by J.Fisher & H.Mac Ewen
- 5. FB wear more especially if they are submited to more stresses especially in rotation
- 6. Polyethylene Debris No significant difference in volumetric concentrations between fixed bearing and Rotating Platform designs (Brown et al. Comparison of Wear Particles Generated by Fixed and Rotating Platform Mobile Bearing Knee Designs , Submitted to ORS 2005) <0.1 μ 0.1-1.0 1.0-10 >10 Same particles but much less !
- 9. Endpoint: revision for any mechanical failure More failures with MB, but excellent results for RP 98.3% 97.7%
- 12. What is the situation today ? What do we know about MB today ? But don’t forget: all MB knees are not the same !
- 13. Now, I’m 90 and they reoperated on me ! #1 at 72 y
- 16. Leeds ProSim Knee Simulator Tests run for 5 million cycles
- 17. Mean Wear Rates
- 19. UHMWPE Kinematics Multidirectional motion accelerates UHMWPE wear (Wang et al. 1996, Proc.IMechE, 210H, 141) Monodirectional motion reduces UHMWPE wear (Marrs et al. 1999, J.Mats.Sci.Mats.Med. 10, 333) Which is proven …..
- 20. Fixed vs RP Fixed bearing multidirectional motion of femoral component relative to bearing multiaxial wear path transverse friction forces higher wear Rotating Platform rotation occurs at tibial tray multidirectional motion at femoral unidirectional wear paths transverse friction forces lower wear
- 21. Fixed Bearing Knees Wear of fixed bearing knees is highly dependent on displacement and rotation kinematics Johnson et al. Wear, 250, 222, 2001. Barnett et al. J.Mats.Sci.Mats.Med, 12, 1039, 2001. Highly active patients may produce high wear with fixed bearing knees
- 22. Polyethylene Debris (Brown et al. Comparison of Wear Particles Generated by Fixed and Rotating Platform Mobile Bearing Knee Designs , Submitted to ORS 2005) Specific Biological Activity of fixed bearing similar to Rotating Platform Higher wear rate of fixed bearing results in Functional Biological Activity more than three times greater than RP, therefore increased osteolytic potential So, much less osteolysis ! 2.1 0.36 LCS ® Rotating Platform 6.8 0.3 Fixed Bearing Functional Biological Activity (FBA) Specific Biological Activity (SBA)
- 24. Now, I’m 90 and they reoperated on me ! #1 at 72 y
- 25. 3-400mm 2 : significant diminution in contact stress often below 10 MPa