A New Automated Way to Measure Polyethylene Wear in THA Using a High Resolution CT Scanner: Method and Analysis
2014 (English)In: Scientific World Journal, ISSN 1537-744X, Vol. 2014, 528407- p.Article in journal (Refereed) Published
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.
Total Hip-Arthroplasty, Acetabular Component Migration, Cross-Linked Polyethylene, Semiautomated Program, Computed-Tomography, Femoral-Head, Prostheses, Radiostereometry, Penetration, Osteolysis
Orthopedics Radiology, Nuclear Medicine and Medical Imaging
IdentifiersURN: urn:nbn:se:kth:diva-140524DOI: 10.1155/2014/528407ISI: 000330650200001ScopusID: 2-s2.0-84893834636OAI: oai:DiVA.org:kth-140524DiVA: diva2:690828
QC 201402272014-01-242014-01-242014-02-27Bibliographically approved