Axisymmetric Finite Element Analysis of a Debonded Total Hip Stem With an Unsupported Distal Tip
| Autor: | K. Hustosky, J. D. Blaha, Timothy L. Norman, V. Saligrama, Thomas A. Gruen |
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| Rok vydání: | 1996 |
| Předmět: |
musculoskeletal diseases
Materials science Biomedical Engineering Prosthesis Design Viscoelasticity Stress (mechanics) Physiology (medical) Materials Testing Ultimate tensile strength Forensic engineering Stress relaxation Humans von Mises yield criterion Computer Simulation Composite material Viscosity Bone Cements technology industry and agriculture Numerical Analysis Computer-Assisted equipment and supplies Bone cement Biomechanical Phenomena Prosthesis Failure surgical procedures operative Creep Cylinder stress Hip Prosthesis |
| Zdroj: | Journal of Biomechanical Engineering. 118:399-404 |
| ISSN: | 1528-8951 0148-0731 |
| Popis: | A tapered femoral total hip stem with a debonded stem-cement interface and an unsupported distal tip subjected to constant axial load was evaluated using two-dimensional (2D) axisymmetric finite element analysis. The analysis was performed to test if the mechanical condition suggest that a “taper-lock” with a debonded viscoelastic bone cement might be an alternative approach to cement fixation of stem type cemented hip prosthesis. Effect of stem-cement interface conditions (bonded, debonded with and without friction) and viscoelastic response (creep and relaxation) of acrylic bone cement on cement mantle stresses and axial displacement of the stem was also investigated. Stem debonding with friction increased maximum cement von Mises stress by approximately 50 percent when compared to the bonded stem. Of the stress components in the cement mantle, radial stresses were compressive and hoop stresses were tensile and were indicative of mechanical taper-lock. Cement mantle stress, creep and stress relaxation and stem displacement increased with increasing load level and with decreasing stem-cement interface friction. Stress relaxation occur predominately in tensile hoop stress and decreased from 1 to 46 percent over the conditions considered. Stem displacement due to cement mantle creep ranged from 614 μm to 1.3 μm in 24 hours depending upon interface conditions and load level. |
| Databáze: | OpenAIRE |
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