title: Does surface roughness influence the primary stability of acetabular cups? A numerical and experimental biomechanical evaluation.
abstract: Most acetabular cups implanted today are press-fit impacted cementless. Anchorage begins with the primary stability given by insertion of a slightly oversized cup. This primary stability is key to obtaining bone ingrowth and secondary stability. We tested the hypothesis that primary stability of the cup is related to surface roughness of the implant, using both an experimental and a numerical models to analyze how three levels of surface roughness (micro, macro and combined) affect the primary stability of the cup. We also investigated the effect of differences in diameter between the cup and its substrate, and of insertion force, on the cups' primary stability. The results of our study show that primary stability depends on the surface roughness of the cup. The presence of macro-roughness on the peripheral ring is found to decrease primary stability; there was excessive abrasion of the substrate, damaging it and leading to poor primary stability. Numerical modeling indicates that oversizing the cup compared to its substrate has an impact on primary stability, as has insertion force.
authors: Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille Cedex 09, France; APHM, Institut du Mouvement et de l'appareil Locomoteur, Hôpital Sainte Marguerite, 249 et 270, bd Sainte-Marguerite, 13274 Marseille, France. Electronic address: sophie.le-cann@etu.univ-amu.fr.
authors: Sophie
authors: S
authors: Le Cann
authors: Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille Cedex 09, France; APHM, Institut du Mouvement et de l'appareil Locomoteur, Hôpital Sainte Marguerite, 249 et 270, bd Sainte-Marguerite, 13274 Marseille, France.
authors: Alexandre
authors: A
authors: Galland
authors: Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille Cedex 09, France.
authors: Benoît
authors: B
authors: Rosa
authors: Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille Cedex 09, France; APHM, Institut du Mouvement et de l'appareil Locomoteur, Hôpital Sainte Marguerite, 249 et 270, bd Sainte-Marguerite, 13274 Marseille, France.
authors: Thomas
authors: T
authors: Le Corroller
authors: Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille Cedex 09, France; APHM, Institut du Mouvement et de l'appareil Locomoteur, Hôpital Sainte Marguerite, 249 et 270, bd Sainte-Marguerite, 13274 Marseille, France.
authors: Martine
authors: M
authors: Pithioux
authors: Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille Cedex 09, France; APHM, Institut du Mouvement et de l'appareil Locomoteur, Hôpital Sainte Marguerite, 249 et 270, bd Sainte-Marguerite, 13274 Marseille, France.
authors: Jean-Noël
authors: JN
authors: Argenson
authors: Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille Cedex 09, France; APHM, Institut du Mouvement et de l'appareil Locomoteur, Hôpital Sainte Marguerite, 249 et 270, bd Sainte-Marguerite, 13274 Marseille, France.
authors: Patrick
authors: P
authors: Chabrand
authors: Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille Cedex 09, France; APHM, Institut du Mouvement et de l'appareil Locomoteur, Hôpital Sainte Marguerite, 249 et 270, bd Sainte-Marguerite, 13274 Marseille, France.
authors: Sébastien
authors: S
authors: Parratte
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D001842:Bone and Bones / Q000502:physiology; D002417:Cattle; D003198:Computer Simulation; D020342:Finite Element Analysis; D006622:Hip Prosthesis; D008422:Materials Testing; D008962:Models, Theoretical; D011474:Prosthesis Design; D014025:Titanium
chemical_list: D014025:Titanium
keywords: Macro- and micro-roughness; Mechanical and numerical experimentation.; Press-fit cup; Primary stability; Total hip arthroplasty