Torabi Kachousangi, Ehsanollah (2016) Edge loading effect on total hip replacement. PhD thesis, University of Warwick.

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Abstract

The most important hip post-surgery problem is named Edge Loading (EL). This phenomenon significantly increases the contact pressure on the ball and the socket of the hip prosthesis hence decreasing the lifetime of the hip prosthesis drastically. Nowadays millions of patients cannot go under total hip replacement surgery due to the short lifetime of the hip prostheses. This research mainly focuses on finding solution for reducing the effect of this phenomenon.

In this research, reasons of EL are investigated and important factors in designing of the prosthesis are studied. Furthermore, a novel hip prosthesis is proposed. The model has been successfully patented with PCT number: PCT/GB2015/052933 and published with International Publication Number: “WO2016/055783Al”. In this study the proposed design is analysed using three methods and the results are compared with the best available hip prosthesis in the market. The key results of the proposed design are outlined below:

-Comparison of the features of the proposed design with those of the available hip prosthesis suggests a promising outcome. This is mostly due to eliminating of the EL causes, in the new design.
-According to Hertzian Contact Theory, the proposed design reduces contact pressure during EL by 99.7% in comparison with the best available prosthesis in the market. This represents an upper limit.
-Finite element method simulation demonstrates up to 63% reduction (lower limit) of contact pressure during EL and also Neck-Rim/Ring impingement by the proposed design in comparison with the best available prosthesis in the market.

Although reduction of contact pressure by the novel design is noticeable, aforementioned methods show different results. This is due to the limitation of every method in this study. In this regard the novel design expecting to reduce contact pressure during EL / Microseparation more than 63% but less than 99.7%.

The novel design may open a new path for the total hip replacement surgery, and solve the EL problem forever.

Item Type:	Thesis (PhD)
Subjects:	R Medicine > RD Surgery T Technology > TA Engineering (General). Civil engineering (General)
Library of Congress Subject Headings (LCSH):	Total hip replacement, Hip joint -- Surgery, Artificial hip joints -- Complications, Artificial hip joints -- Design, Contact mechanics
Official Date:	August 2016
Dates:	Date Event August 2016 Submitted
Institution:	University of Warwick
Theses Department:	Department of Engineering
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Mao, Ken
Format of File:	pdf
Extent:	xvi, 164 leaves : illustrations, charts
Language:	eng

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