Biomechanical validation of additively manufactured artificial femoral bones

BMC Biomedical Engineering

Research

C. Neupetsch¹  M. Pietsch²  A. Carabello³  W.-G. Drossel³  T. Wendler⁴  F. Metzner⁴ 

[1] Department of Orthopaedics, Trauma and Plastic Surgery, Leipzig University, Leipzig, Germany;Fraunhofer Institute for Machine Tools and Forming Technology, Dresden, Germany;Professorship of Adaptronics and Lightweight Design, Chemnitz Universtiy of Technology, Chemnitz, Germany;Fraunhofer Institute for Machine Tools and Forming Technology, Dresden, Germany;Fraunhofer Institute for Machine Tools and Forming Technology, Dresden, Germany;Professorship of Adaptronics and Lightweight Design, Chemnitz Universtiy of Technology, Chemnitz, Germany;ZESBO Centre for Research on Musculoskeletal Systems, Leipzig University, Semmelweisstraße 14, 04103, Leipzig, Germany;Department of Orthopaedics, Trauma and Plastic Surgery, Leipzig University, Leipzig, Germany;

关键词: Artificial bone;    Additive manufacturing;    Femoral;    Bone model;    3D-printing;    Femur;    Biomechanics;    Hip;    3d-printing;   

DOI  :  10.1186/s42490-022-00063-1

 received in 2022-05-03, accepted in 2022-07-21,  发布年份 2022

来源: Springer

【 摘 要 】

Replicating the mechanical behavior of human bones, especially cancellous bone tissue, is challenging. Typically, conventional bone models primarily consist of polyurethane foam surrounded by a solid shell. Although nearly isotropic foam components have mechanical properties similar to cancellous bone, they do not represent the anisotropy and inhomogeneity of bone architecture. To consider the architecture of bone, models were developed whose core was additively manufactured based on CT data. This core was subsequently coated with glass fiber composite. Specimens consisting of a gyroid-structure were fabricated using fused filament fabrication (FFF) techniques from different materials and various filler levels. Subsequent compression tests showed good accordance between the mechanical behavior of the printed specimens and human bone. The unidirectional fiberglass composite showed higher strength and stiffness than human cortical bone in 3-point bending tests, with comparable material behaviors being observed. During biomechanical investigation of the entire assembly, femoral prosthetic stems were inserted into both artificial and human bones under controlled conditions, while recording occurring forces and strains. All of the artificial prototypes, made of different materials, showed analogous behavior to human bone. In conclusion, it was shown that low-cost FFF technique can be used to generate valid bone models and selectively modify their properties by changing the infill.

【 授权许可】

CC BY   
© The Author(s) 2022

【 图 表 】

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