Sensitivity analysis of a cemented hip stem to implant position and cement mantle thickness
| Autor: | Junfen Shi, Michael A. Strickland, Martin Browne, Mark Taylor, Gunnar Flivik |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Arthroplasty
Replacement Hip Radiography Finite Element Analysis Biomedical Engineering Bioengineering Rotation Gait (human) Humans Femur Gait Aged Cement Hip business.industry Bone Cements Biomechanics Reproducibility of Results General Medicine Finite element method Biomechanical Phenomena Computer Science Applications Human-Computer Interaction Bone Substitutes Female Hip Prosthesis Stress Mechanical Implant business Geology Biomedical engineering |
| Zdroj: | Computer Methods in Biomechanics and Biomedical Engineering. 17:1671-1684 |
| ISSN: | 1476-8259 1025-5842 |
| Popis: | Patient-specific finite element models of the implanted proximal femur can be built from pre-operative computed tomography scans and post-operative X-rays. However, estimating three-dimensional positioning from two-dimensional radiographs introduces uncertainty in the implant position. Further, accurately measuring the thin cement mantle and the degree of cement-bone interdigitation from imaging data is challenging. To quantify the effect of these uncertainties in stem position and cement thickness, a sensitivity study was performed. A design-of-experiment study was implemented, simulating both gait and stair ascent. Cement mantle stresses and bone-implant interface strains were monitored. The results show that small variations in alignment affect the implant biomechanics, especially around the most proximal and most distal ends of the stem. The results suggest that implant position is more influential than cement thickness. Rotation around the medial-lateral axis is the dominant factor in the proximal zones and stem translations are the dominant factors around the distal tip. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|