title: [Pressfit of equatorially roughened cementless acetabular components--a finite element analysis].
abstract: OBJECTIVE
  Does the pressfit anchorage of cementless acetabular cups depend on the roughness of the pole? To answer this question the primary pressfit of two cementless acetabular cups which differ only with regard to the roughness of their poles were compared by means of finite elements analysis.
  
  
  METHODS
  It was assumed that the material properties of bone are homogeneous, isotropic and linearly elastic. Material-specific values of cancellous bone with three different bone densities were used. Assumption of isotropy represents an approximation.
  
  
  RESULTS
  Comparison of the two prosthesis designs revealed that both designs/shapes cause similar patterns of bone deformation and tension.
  
  
  CONCLUSIONS
  It can therefore be concluded that with regard to pressfit anchorage the prosthesis with milled polar surface is according to FEA mechanically equivalent to the prosthesis with non-milled polar surface.
authors.affiliation: Klinik für Orthopädie, Universität Duisburg-Essen, Deutschland. mariusvonknoch@yahoo.com
authors.forename: Marius
authors.initials: M
authors.lastname: von Knoch
authors.forename: Thomas
authors.initials: T
authors.lastname: Pandorf
authors.forename: Robin
authors.initials: R
authors.lastname: Büscher
authors.forename: Andreas
authors.initials: A
authors.lastname: Piotrowski
authors.forename: Fabian
authors.initials: F
authors.lastname: von Knoch
authors.forename: Theodorus
authors.initials: T
authors.lastname: Patsalis
authors.forename: Christian
authors.initials: C
authors.lastname: Wedemeyer
authors.forename: Axel
authors.initials: A
authors.lastname: Marx
authors.forename: Alfons
authors.initials: A
authors.lastname: Fischer
authors.forename: Franz
authors.initials: F
authors.lastname: Löer
authors.forename: Guido
authors.initials: G
authors.lastname: Saxler
mesh_terms: D000077:Acetabulum / Q000502:physiology* / Q000601:surgery; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods*; D002484:Cementation; D017076:Computer-Aided Design; D019544:Equipment Failure Analysis / Q000379:methods*; D020342:Finite Element Analysis; D017276:Friction; D006244:Hardness; D006801:Humans; D011312:Pressure; D011474:Prosthesis Design; D013314:Stress, Mechanical; D013499:Surface Properties