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The Scientific World Journal - Volume 2014 2014, Article ID 528407, 9 pages -

Research Article

School of Information and Communication Technology, KTH Royal Institute of Technology, Isafjordsgatan 26, 418 164-40 Stockholm, Sweden

Department of Radiology, New York University, 550 First Avenue TSHW232, New York, NY 10016, USA

Department of Molecular Medicine and Surgery, Section of Orthopaedics and Sports Medicine, Karolinska Institute, A2:07, 171 76 Stockholm, Sweden

School of Computing, University of Utah, College of Engineering, 50 Central Campus Dr., Room 3190, Salt Lake City, UT 84112, USA

Received 4 October 2013; Accepted 7 November 2013; Published 22 January 2014

Academic Editors: J. U. Carmona and Y. K. Tu

Copyright © 2014 Gerald Q. Maguire Jr. et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

As the most advantageous total hip arthroplasty THA operation is the first, timely replacement of only the liner is socially and economically important because the utilization of THA is increasing as younger and more active patients are receiving implants and they are living longer. Automatic algorithms were developed to infer liner wear by estimating the separation between the acetabular cup and femoral component head given a computed tomography CT volume. Two series of CT volumes of a hip phantom were acquired with the femoral component head placed at 14 different positions relative to the acetabular cup. The mean and standard deviation SD of the diameter of the acetabular cup and femoral component head, in addition to the range of error in the expected wear values and the repeatability of all the measurements, were calculated. The algorithms resulted in a mean ±SD for the diameter of the acetabular cup of 54.21 ±0.011 mm and for the femoral component head of 22.09 ±0.02 mm. The wear error was ±0.1 mm and the repeatability was 0.077 mm. This approach is applicable clinically as it utilizes readily available computed tomography imaging systems and requires only five minutes of human interaction.





Autor: Gerald Q. Maguire Jr., Marilyn E. Noz, Henrik Olivecrona, Michael P. Zeleznik, and Lars Weidenhielm

Fuente: https://www.hindawi.com/



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