Subsidence of Additively-Manufactured Cages in Foam Substrates: Effect of Contact Topology
| Autor: | Rachel R. Collino, Ali Kiapour, Matthew R. Begley |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
030222 orthopedics
Materials science Compressive Strength Contact geometry Biomedical Engineering Stiffness Prostheses and Implants Penetration (firestop) Topology Weight-Bearing body regions 03 medical and health sciences Trabecular bone Spinal Fusion 0302 clinical medicine Resist Physiology (medical) Materials Testing medicine medicine.symptom Wall thickness Porosity Contact area 030217 neurology & neurosurgery |
| Zdroj: | Journal of Biomechanical Engineering. 142 |
| ISSN: | 1528-8951 0148-0731 |
| Popis: | Subsidence of implants into bone is a major source of morbidity. The underlying mechanics of the phenomenon are not clear, but are likely related to interactions between contact stresses and the underlying porous trabecular bone structure. To gain insight into these interactions, we studied the penetration of three-dimensional (3D)-printed indenters with systematically varying geometries into Sawbones® foam substrates and isolated the effects of contact geometry from those of overall contact size and area. When size, contact area, and indented material stiffness and strength are controlled for, we show that resistance to penetration is in fact a function of topology only. Indenters with greater line contact lengths support higher subsidence loads in compression. These results have direct implications for the design of implants to resist subsidence into bone. |
| Databáze: | OpenAIRE |
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