Kim, Sunghwan
(2014)
Contact Stress Analysis of the Native Radial Head and Radial Head Implants.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
A radial head fracture is a common fracture of the elbow joint most frequently caused by a fall on an outstretched arm. When the radial head is comminuted and reconstruction is not viable, radial head replacement is often the preferred option. There are basically two choices for the radial head implants: monoblock and bipolar. However, little research examining the performance of available radial head implants has been conducted. In this study, a finite element model for the intact elbow joint extracted from CT scans of a cadaveric elbow was created. The constructed FE model was validated with cadaveric experiments using Fuji pressure sensitive film. Then, two different implant models were generated by replacing the radial head with monoblock and bipolar implants. Contact stress and area for each model were calculated and compared under various loading conditions in the contact areas between the radial head and the capitellum of the humerus, and between the radial head and the radial notch of the ulna. A significant difference was found in both maximum contact stress and contact area between the native elbow and two types of implants. Contact stress for monoblock was higher than that for bipolar and vice versa for contact area. FE predictions showed the same pattern as measurements from Fuji analysis did although they overestimated the maximum contact stress and underestimated the contact area compared to the Fuji film experimental results.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
19 September 2014 |
| Date Type: |
Publication |
| Defense Date: |
29 April 2014 |
| Approval Date: |
19 September 2014 |
| Submission Date: |
25 July 2014 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
132 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Bioengineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
radial head fracture, contact stress, finite element, monoblock, bipolar |
| Date Deposited: |
19 Sep 2014 18:05 |
| Last Modified: |
15 Nov 2016 14:22 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/22493 |
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