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A New Automated Way to Measure Polyethylene Wear in THA Using a High Resolution CT Scanner: Method and Analysis
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).ORCID iD: 0000-0002-6066-746X
New York University, Department of Radiology. (Nuclear Medicine)ORCID iD: 0000-0002-2442-1622
Karolinska Institute. (Department of Molecular Medicine and Surgery, Section of Orthopaedics and Sport Medicine)
University of Utah, Salt Lake City, UT, USA. (School of Computing)
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2014 (English)In: Scientific World Journal, ISSN 1537-744X, Vol. 2014, 528407- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. Vol. 2014, 528407- p.
Keyword [en]
Total Hip-Arthroplasty, Acetabular Component Migration, Cross-Linked Polyethylene, Semiautomated Program, Computed-Tomography, Femoral-Head, Prostheses, Radiostereometry, Penetration, Osteolysis
National Category
Orthopedics Radiology, Nuclear Medicine and Medical Imaging
URN: urn:nbn:se:kth:diva-140524DOI: 10.1155/2014/528407ISI: 000330650200001ScopusID: 2-s2.0-84893834636OAI: diva2:690828

QC 20140227

Available from: 2014-01-24 Created: 2014-01-24 Last updated: 2014-02-27Bibliographically approved

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Maguire Jr., Gerald Q.Noz, Marilyn E.
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