Abstract：
:Total knee replacement implants consisting of a Co-29Cr-6Mo alloy femoral component and a Ti-6Al-4V tibial component are the basis for the additive manufacturing of novel solid, mesh, and foam monoliths using electron beam melting (EBM). Ti-6Al-4V solid prototype microstructures were primarily α-phase acicular platelets while the mesh and foam structures were characterized by α(')-martensite with some residual α. The Co-29Cr-6Mo containing 0.22% C formed columnar (directional) Cr(23)C(6) carbides spaced ~2 μm in the build direction, while HIP-annealed Co-Cr alloy exhibited an intrinsic stacking fault microstructure. A log-log plot of relative stiffness versus relative density for Ti-6Al-4V and Co-29Cr-6Mo open-cellular mesh and foams resulted in a fitted line with a nearly ideal slope, n = 2.1. A stress shielding design graph constructed from these data permitted mesh and foam implant prototypes to be fabricated for compatible bone stiffness.
journal_name
J Mech Behav Biomed Materauthors
Murr LE,Amato KN,Li SJ,Tian YX,Cheng XY,Gaytan SM,Martinez E,Shindo PW,Medina F,Wicker RBdoi
10.1016/j.jmbbm.2011.05.010subject
Has Abstractpub_date
2011-10-01 00:00:00pages
1396-411issue
7eissn
1751-6161issn
1878-0180pii
S1751-6161(11)00112-3journal_volume
4pub_type
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