[Pressfit of equatorially roughened cementless acetabular components--a finite element analysis].
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.
von Knoch
Marius
M
Klinik für Orthopädie, Universität Duisburg-Essen, Deutschland. mariusvonknoch@yahoo.com
Pandorf
Thomas
T
Büscher
Robin
R
Piotrowski
Andreas
A
von Knoch
Fabian
F
Patsalis
Theodorus
T
Wedemeyer
Christian
C
Marx
Axel
A
Fischer
Alfons
A
Löer
Franz
F
Saxler
Guido
G
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