title: Experimental investigation of the effect of surface roughness on bone-cement-implant shear bond strength.
abstract: Debonding of cemented bone implants is regarded as a major contributor to complications. The relationship between shear bond strength and surface roughness has been investigated, however there are inconsistencies in the trends reported in different studies. The shear strength between poly(methyl methacrylate) bone-cement and sand blasted cobalt-chromium and titanium alloy surfaces was measured to investigate the relationship between interfacial shear strength and surface topology. Surface roughness was quantified by a power law relationship fitted to Fourier spectra as well as three traditional parameters (arithmetical average roughness (Ra), volume of interdigitation (Rr), and RMS slope (Rdq)). We found that the interfacial shear strength is directly proportional to the exponent of the surfaces power spectra (P2) and Rdq, but not to Ra and Rr. However, Rdq is shown to be critically dependent on sampling frequency, making it sensitive to measurement settings. P2 was found to be a robust measure of the surface roughness being independent of sampling frequency.
authors.affiliation: Biomaterials, Department of Clinical Medicine, University of Bergen, Bergen, Norway.
authors.forename: Alexander Franciscus
authors.initials: AF
authors.lastname: van Tol
authors.forename: John E
authors.initials: JE
authors.lastname: Tibballs
authors.forename: Nils
authors.initials: N
authors.lastname: Roar Gjerdet
authors.forename: Peter
authors.initials: P
authors.lastname: Ellison
mesh_terms: D000497:Alloys / Q000737:chemistry; D001843:Bone Cements / Q000737:chemistry*; D005583:Fourier Analysis; D008422:Materials Testing; D019736:Prostheses and Implants; D033081:Shear Strength; D013499:Surface Properties
chemical_list: D000497:Alloys; D001843:Bone Cements
keywords: Bone-cement; Femoral stem; Shear strength; Surface roughness; Total hip replacement