Local deformation behavior of surface porous polyether-ether-ketone.
Surface porous polyether-ether-ketone has the ability to maintain the tensile monotonic and cyclic strength necessary for many load bearing orthopedic applications while providing a surface that facilitates bone ingrowth; however, the relevant deformation behavior of the pore architecture in response to various loading conditions is not yet fully characterized or understood. The focus of this study was to examine the compressive and wear behavior of the surface porous architecture using micro Computed Tomography (micro CT). Pore architectures of various depths (~0.5-2.5mm) and pore sizes (212-508µm) were manufactured using a melt extrusion and porogen leaching process. Compression testing revealed that the pore architecture deforms in the typical three staged linear elastic, plastic, and densification stages characteristic of porous materials. The experimental moduli and yield strengths decreased as the porosity increased but there was no difference in properties between pore sizes. The porous architecture maintained a high degree of porosity available for bone-ingrowth at all strains. Surface porous samples showed no increase in wear rate compared to injection molded samples, with slight pore densification accompanying wear.
School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, J. Erskine Love Building, Atlanta, GA 30332, United States. Electronic address: nevans3@gatech.edu.
Nathan T
NT
Evans
School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, GA 30332, United States. Electronic address: brennan@gatech.edu.
F Brennan
FB
Torstrick
MedShape, Inc., 1575 Northside Drive, NW, Suite 440, Atlanta, GA 30318, United States. Electronic address: david.safranski@medshape.com.
David L
DL
Safranski
School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, GA 30332, United States. Electronic address: robert.guldberg@me.gatech.edu.
Robert E
RE
Guldberg
Department of Mechanical Engineering and Materials Science, Duke University, Box 90300 Hudson Hall, Durham, NC 27708-0287, United States. Electronic address: ken.gall@duke.edu.
Ken
K
Gall
D019245:Compressive Strength; D004987:Ethers / Q000032:analysis*; D007659:Ketones / Q000032:analysis*; D008422:Materials Testing; D016062:Porosity; D054457:Tissue Scaffolds; D055114:X-Ray Microtomography
D004987:Ethers; D007659:Ketones
Compression; Microcomputed tomography; Polyether-ether-ketone; Porous; Wear