Structural and mechanical evaluations of a topology optimized titanium interbody fusion cage fabricated by selective laser melting process

被引:143
作者
Lin, Chia-Ying [1 ]
Wirtz, Tobias
LaMarca, Frank
Hollister, Scott J.
机构
[1] Univ Michigan, Dept Neurosurg, Spine Res Lab, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Scaffold Tissue Engn Grp, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Dept Biomed Engn, Ann Arbor, MI 48109 USA
[4] Fraunhofer Inst Laser Technol, Aachen, Germany
[5] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA
[6] Univ Michigan, Dept Surg, Ann Arbor, MI 48109 USA
关键词
interbody fusion cage; topology optimization; titanium alloy; selective laser melting; porous tantalum;
D O I
10.1002/jbm.a.31231
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
A topology optimized lumbar interbody fusion cage was made of Ti-A16-V4 alloy by the rapid prototyping process of selective laser melting (SLM) to reproduce designed microstructure features. Radiographic characterizations and the mechanical properties were investigated to determine how the structural characteristics of the fabricated cage were reproduced from design characteristics using micro-computed tomography scanning. The mechanical modulus of the designed cage was also measured to compare with tantalum, a widely used porous metal. The designed microstructures can be clearly seen in the micrographs of the micro-CT and scanning electron microscopy examinations, showing the SLM process can reproduce intricate microscopic features from the original designs. No imaging artifacts from micro-CT were found. The average compressive modulus of the tested caged was 2.97 +/- 0.90 GPa, which is comparable with the reported porous tantalum modulus of 3 GPa and falls between that of cortical bone (15 GPa) and trabecular bone (0.1-0.5 GPa). The new porous Ti-6A14V optimal-structure cage fabricated by SLM process gave consistent mechanical properties without artifactual distortion in the imaging modalities and thus it can be a promising alternative as a porous implant for spine fusion. (c) 2007 Wiley Periodicals, Inc.
引用
收藏
页码:272 / 279
页数:8
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