Corrosion and Mechanical performance of biodegradable metallic orthopaedic implants: Modelling and experimental validation
Ph.D. Student Aditya Avinash Joshi
Department of Mechanical Engineering, University of Canterbury
Time & Place
Tue, 08 Jun 2021 11:40:00 NZST in E12, Engineering Core
The last couple of decades have witnessed many advances in the development of permanent internal fixation devices used for the correction of craniomaxillofacial deformities. However, many studies have reported that these metallic devices require removal in several cases owing to various issues. Absorbable fixation devices based on metallic materials (Mg, Zn, Fe, etc.) are emerging as promising alternatives to permanent fixation devices. Biodegradable metals such as magnesium (Mg) alloys are excellent material for such devices due to several advantages include favourable mechanical properties and excellent biocompatibility. One major challenge obstructing widespread use of Mg alloys for manufacturing of absorbable internal fixation devices is their high corrosion rates, that may result in a loss in function of the device before the healing process is complete. This project aims to investigate the corrosion behaviour of Mg-based implants that are aimed at craniomaxillofacial applications. The work aims to develop numerical models that predict the time-dependent corrosion and mechanical performance of Mg alloys. The outcome of the project would be a new framework for the design of Mg-based craniomaxillofacial implant devices. This work also examines the effects of the mechanical design and manufacturing process for Mg-based screws and plates on their corrosion resistance and mechanical performance. The overarching focus of this research is to improve the treatment outcomes of bone fracture immobilisation in craniofacial orthopaedic applications by developing an optimal design strategy that permits the safe absorption of a Mg alloy implant system.
Supervisor: Associate Prof Mark Staiger