| Start Date: | 2/22/2016 | Start Time: | 4:00 PM |
| End Date: | 2/22/2016 | End Time: | 6:00 PM |
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Event Description
BIOMED PhD Research Proposal
Title: Investigation of Taper Design and Material Factors That Affect Corrosion at the Femoral Head-stem Junctions in Total Hip Arthroplasties
Speaker: Sevi Kocagoz, PhD candidate, School of Biomedical Engineering, Science and Health Systems
Advisor: Steven Kurtz, Research Associate Professor, School of Biomedical Engineering, Science and Health Systems
Abstract:
Modularity in total hip arthroplasty (THA) designs, allows intraoperative flexibility for the surgeon to adapt leg length and femoral offset to the individual anatomy and gives the option to keep a well-fixed femoral stem and revise femoral head and acetabulum as needed. In early designs, modularity was only used in the femoral head-stem tapers. In the 1980s-1990s, researchers detected corrosion at this interface [13, 14]; however, the clinical significance was unclear at this time and the use of modularity continued. Recent design changes to THA include multiple modular tapers and adapter sleeves for increased intraoperative flexibility and large head metal on metal (LHMOM) bearings for lower wear and improved range of motion. The clinical use of these designs led to increased reports of adverse local tissue reactions (ALTRs) to release of metallic material and corrosion at the modular tapers became a clinical concern. ALTR due to corrosion is also observed in total knee arthroplasty cases. Taper corrosion still poses a clinical risk for all components that employs any modular connection. There is a need to systematically investigate the factors that increase the risk of taper corrosion.
The process leading to corrosion and metallic particle release from modular connections is mechanically assisted crevice corrosion (MACC). The severity of MACC at tapers depends on a combination of mechanical, electrochemical, geometrical, material and solution conditions. Previous researchers have investigated the device design and material factors that may lead to variations in these conditions; however, there still doesn’t exist any standards for the design, materials and manufacture of tapers. The goals for this doctoral research were to:
- Develop method for measuring taper angle clearance. Use method to measure retrievals and compare taper corrosion between ceramic and CoCr heads in retrievals using a matched cohort study design as a function of taper angle clearance.
- Develop and validate a quantitative method to estimate volumetric material lost from the taper surfaces. Use method to measure retrievals and compare taper corrosion between ceramic and CoCr heads in retrievals using a matched cohort study design as a function of volumetric material loss.
- Investigate fretting-corrosion behavior of PEEK-metal interfaces and compare with metal-metal interfaces using a previously developed in vitro pin-on-disk fretting-corrosion test system. Mitigation of taper fretting-corrosion using alternative materials.
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Location:
Paul Peck Problem Solving Center, Room 215, located at 101 N. 33rd Street. |
Audience:
Undergraduate StudentsGraduate StudentsFacultyStaff |
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