Thesis
3-D morphology of the ankle joint as related to the design of the interfacing surfaces of an anatomically-based total ankle replacement
Master of Science (M.S.), Drexel University
Sep 2018
DOI:
https://doi.org/10.17918/7kwa-7570
Abstract
Ankle arthritis is a painful and debilitating condition caused by abnormal wear to the cartilage covering the talocrural joint. Initially, symptoms are treated conservatively. Use of specialized ankle braces, cortisone injections, and physical therapy are used to combat pain. Once these treatments no longer suffice, non-conservative treatment must be sought. Patients choose between an ankle fusion and total ankle replacement. Foot ankle ankle surgeons often prefer ankle fusion because of the unacceptably high revision rates in total ankle replacement. One of the most common reasons for revision surgery is loosening of the ankle joint. The stock surface geometry of commercially available total ankle replacements stands in stark contrast to the complex, nuanced morphology of the talar dome and tibial plafond. As a result, large amounts of bone are resected during surgery. This is problematic because the average cortical bone thickness of the talus and tiba is very thin. Therefore, most of the implant adhesion is achieved through pins inserted into soft, cancellous bone. The design of the interfacing surface of the total ankle replacement should be based on surface anatomy to mitigate the incidence of revision surgery. As a prerequisite to this endeavor, the surface morphology of the talar dome and tibial plafond must be quantitatively defined by a set of anatomical measurements. In this study, 44 anatomical parameters are measured on the tibia and talus with the intent that they will form the basis of a subject-specific, parameter-based interfacing surface of a total ankle replacement. Distance mapping validates the merit of this process, as average deviation between the engineered surface and the anatomical surface averaged less than 0.4 mm.
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Details
- Title
- 3-D morphology of the ankle joint as related to the design of the interfacing surfaces of an anatomically-based total ankle replacement
- Creators
- Joseph Masgai - DU
- Contributors
- Sorin Siegler (Advisor) - Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Master of Science (M.S.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xii, 61 pages
- Resource Type
- Thesis
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Mechanical Engineering (and Mechanics) (1970-2026); Drexel University
- Other Identifier
- 8305; 991014632940604721