Finite-element modelling of femoral shaft fracture fixation techniques post total hip arthroplasty

William Mihalko, Armand J. Beaudoin, John A. Cardea, William R. Krause

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The presence of a femoral prosthesis superior to a shaft fracture severely complicates fixation and treatment. This study uses two-dimensional, multithickness, plane stress finite-element models of a femur with prosthesis to investigate the stresses developed with the application of three popular fixation techniques: revision to a long stem prosthesis, lateral plating with a cortical bone allograft strut and cerclage wires, and custom plate application with proximal parham band fixation with distal cortical screws (Ogden plate). The plate and bone contact as well as the fracture site contact were modelled by using orthotropic elements with custom-fit moduli so that only the normal stress to the interface was significant. A thermal analogy was used to model the cerclage and Parham band preloads so that representative preloads in the proximal fixation of the two types of plate treatments could be modelled. A parametric study was performed with the long-prosthesis model to show variations in stem lengths of one, two and three femoral diameters distal to the fracture site. The Ogden plate model showed a transfer of tensile stress near the proximalmost band, with the highest tensile stress being at the fracture site with evidence of stress shielding of the proximal lateral cortex. The cortical bone strut model showed a transfer of tensile stress to the bone strut but showed less shielding of the proximal cortex. The cerclage wires at the base of the bone strut showed the highest changes in load with the distalmost wire increasing to almost four times its original preload. The increase in stem length for the long-prosthesis model showed stress shielding around the fracture site with a transfer of stress occurring more distally with each increment in stem length.

Original languageEnglish (US)
Pages (from-to)469-476
Number of pages8
JournalJournal of Biomechanics
Volume25
Issue number5
DOIs
StatePublished - Jan 1 1992
Externally publishedYes

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Fracture fixation
Post and Core Technique
Arthroplasty
Fracture Fixation
Femoral Fractures
Prostheses and Implants
Hip
Struts
Bone
Tensile stress
Shielding
Thigh
Wire
Bone Plates
Bone and Bones
Femur
Allografts
Plating
Hot Temperature
Therapeutics

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Orthopedics and Sports Medicine
  • Biomedical Engineering
  • Rehabilitation

Cite this

Finite-element modelling of femoral shaft fracture fixation techniques post total hip arthroplasty. / Mihalko, William; Beaudoin, Armand J.; Cardea, John A.; Krause, William R.

In: Journal of Biomechanics, Vol. 25, No. 5, 01.01.1992, p. 469-476.

Research output: Contribution to journalArticle

Mihalko, William ; Beaudoin, Armand J. ; Cardea, John A. ; Krause, William R. / Finite-element modelling of femoral shaft fracture fixation techniques post total hip arthroplasty. In: Journal of Biomechanics. 1992 ; Vol. 25, No. 5. pp. 469-476.
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