Interface micromechanics of transverse sections from retrieved cemented hip reconstructions: an experimental and finite element comparison.
In finite element analysis (FEA) models of cemented hip reconstructions, it is crucial to include the cement-bone interface mechanics. Recently, a micromechanical cohesive model was generated which reproduces the behavior of the cement-bone interface. The goal was to investigate whether this cohesive model was directly applicable on a macro level. From transverse sections of retrieved cemented hip reconstructions, two FEA-models were generated. The cement-bone interface was modeled with cohesive elements. A torque was applied and the cement-bone interface micromotions, global stiffness and stem translation were monitored. A sensitivity analysis was performed to investigate whether the cohesive model could be improved. All results were compared with experimental findings. That the original cohesive model resulted in a too compliant macromechanical response; the motions were too large and the global stiffness too small. When the cohesive model was modified, the match with the experimental response improved considerably.
Orthopaedic Research Laboratory, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. d.waanders@orthop.umcn.nl
Daan
D
Waanders
Dennis
D
Janssen
Sanaz
S
Berahmani
Mark A
MA
Miller
Kenneth A
KA
Mann
Nico
N
Verdonschot
D000368:Aged; D000369:Aged, 80 and over; D001843:Bone Cements / Q000032:analysis / Q000737:chemistry*; D002102:Cadaver; D003198:Computer Simulation; D005260:Female; D020342:Finite Element Analysis; D006244:Hardness; D006621:Hip Joint / Q000473:pathology* / Q000503:physiopathology* / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008954:Models, Biological; D008956:Models, Chemical; D013499:Surface Properties; D013718:Tensile Strength
D001843:Bone Cements