Document Type

Thesis

Degree

Master of Science (MS)

Department

Materials Science and Engineering

First Advisor's Name

William Kinzy Jones

First Advisor's Committee Title

Committee Chair

Second Advisor's Name

Benjamin Boesl

Second Advisor's Committee Title

Committee Member

Third Advisor's Name

Norman Munroe

Third Advisor's Committee Title

Committee Member

Keywords

Total Hip Prosthesis, Cobalt-Chrome, Ti-6al-4v, Biomaterials, Corrosion, Metallosis

Date of Defense

4-16-2015

Abstract

The purpose of this study was to evaluate the incidence of corrosion and fretting in 48 retrieved titanium-6aluminum-4vanadium and/or cobalt-chromium-molybdenum modular total hip prosthesis with respect to alloy material microstructure and design parameters. The results revealed vastly different performance results for the wide array of microstructures examined. Severe corrosion/fretting was seen in 100% of as-cast, 24% of low carbon wrought, 9% of high carbon wrought and 5% of solution heat treated cobalt-chrome. Severe corrosion/fretting was observed in 60% of Ti-6Al-4V components. Design features which allow for fluid entry and stagnation, amplification of contact pressure and/or increased micromotion were also shown to play a role. 75% of prosthesis with high femoral head-trunnion offset exhibited poor performance compared to 15% with a low offset. Large femoral heads (>32mm) did not exhibit poor corrosion or fretting. Implantation time was not sufficient to cause poor performance; 54% of prosthesis with greater than 10 years in-vivo demonstrated none or mild corrosion/fretting.

Identifier

FI15032195

 

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