title: Mechanical stability of custom-made implants: Numerical study of anatomical device and low elastic Young's modulus alloy.
abstract: The advent of new manufacturing technologies such as additive manufacturing deeply impacts the approach for the design of medical devices. It is now possible to design custom-made implants based on medical imaging, with complex anatomic shape, and to manufacture them. In this study, two geometrical configurations of implant devices are studied, standard and anatomical. The comparison highlights the drawbacks of the standard configuration, which requires specific forming by plastic strain in order to be adapted to the patient's morphology and induces stress field in bones without mechanical load in the implant. The influence of low elastic modulus of the materials on stress distribution is investigated. Two biocompatible alloys having the ability to be used with SLM additive manufacturing are considered, commercial Ti-6Al-4V and Ti-26Nb. It is shown that beyond the geometrical aspect, mechanical compatibility between implants and bones can be significantly improved with the modulus of Ti-26Nb implants compared with the Ti-6Al-4V.
authors.affiliation: Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux LEM3 UMR CNRS 7239, Arts et Métiers ParisTech Campus de Metz, Université de Lorraine, Ile de Saulcy, F-57078 Metz-Cedex 01, France. Electronic address: paul.didier@univ-lorraine.fr.
authors.forename: P
authors.initials: P
authors.lastname: Didier
authors.affiliation: Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux LEM3 UMR CNRS 7239, Arts et Métiers ParisTech Campus de Metz, Université de Lorraine, Ile de Saulcy, F-57078 Metz-Cedex 01, France.
authors.forename: B
authors.initials: B
authors.lastname: Piotrowski
authors.affiliation: Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux LEM3 UMR CNRS 7239, Arts et Métiers ParisTech Campus de Metz, Université de Lorraine, Ile de Saulcy, F-57078 Metz-Cedex 01, France.
authors.forename: M
authors.initials: M
authors.lastname: Fischer
authors.affiliation: Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux LEM3 UMR CNRS 7239, Arts et Métiers ParisTech Campus de Metz, Université de Lorraine, Ile de Saulcy, F-57078 Metz-Cedex 01, France.
authors.forename: P
authors.initials: P
authors.lastname: Laheurte
mesh_terms: D000497:Alloys; D001672:Biocompatible Materials / Q000737:chemistry*; D001863:Bone Screws; D055119:Elastic Modulus; D008962:Models, Theoretical; D019736:Prostheses and Implants; D033081:Shear Strength; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; C070282:Ti-6Al-7Nb alloy; C031462:titanium alloy (TiAl6V4); D014025:Titanium
keywords: Custom-made device; Finite element modeling; Low modulus Beta-titanium alloy; SLM additive manufacturing; Stress shielding