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Dissertation
Effect of heterogeneity and density variation on stress distribution at the bone implant interface of a total ankle replacement using finite element analysis
Doctor of Philosophy (Ph.D.), Drexel University
Mar 2025
DOI:
https://doi.org/10.17918/00010905
Abstract
Total ankle replacements are known to fail at a higher rate than total replacements of similar joints, such as the knee and hip. Common modes of failure for total ankle replacements involve subsidence of the implant into the talus following failure of the underlying bone, as well as the loosening and eventual dislodging of the implant from the neighboring bone. Many factors are relevant to the eventual failure of a total ankle replacement, such as the design of the contact surface of the implant, the fixation features chosen, and the morphology and material properties of the underlying bone. This manuscript discloses a procedure by which the bone implant interface beneath the total ankle replacement is characterized. To achieve this, the bone properties of the tibia and talus are established, with heterogeneous bone properties examined and quantified using Principal Component Analysis. Next, a system of reference frames for the alignment of the ankle joint is established so that the orientation of the joint and the position of the implant within the joint can be clearly established. Force Inputs for use in a finite element analysis are then determined through a dynamic model and validated against physical testing. Finally, finite element analysis is performed to observe the effect of changes in the mechanical properties of the bone and changes to the design of the bone implant interface surface on the stress distribution in the bone and implant.
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Details
- Title
- Effect of heterogeneity and density variation on stress distribution at the bone implant interface of a total ankle replacement using finite element analysis
- Creators
- Jordan Thomas Stolle
- Contributors
- Sorin Siegler (Advisor)Ahmad Raeisi Najafi (Advisor)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- 114 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Mechanical Engineering (and Mechanics) [Historical]; Drexel University
- Other Identifier
- 991022043494604721