Validation of a 3D CT method for measurement of linear wear of acetabular cups: A hip simulator study
2011 (English)In: Acta Orthopaedica, ISSN 1745-3674, E-ISSN 1745-3682, Vol. 82, no 1, 35-41 p.Article in journal (Refereed) Published
Material and methods Ultra-high molecular weight polyethylene cups with a titanium mesh molded on the outside were subjected to wear using a hip simulator. Before and after wear, they were (1) imaged with a CT scanner using a phantom model device, (2) measured using a coordinate measurement machine (CMM), and (3) weighed. CMM was used as the reference method for measurement of femoral head penetration into the cup and for comparison with CT, and gravimetric measurements were used as a reference for both CT and CMM. Femoral head penetration and wear vector angle were studied. The head diameters were also measured with both CMM and CT. The repeatability of the method proposed was evaluated with two repeated measurements using different positions of the phantom in the CT scanner. Results The accuracy of the 3D CT method for evaluation of linear wear was 0.51 mm and the repeatability was 0.39 mm. Repeatability for wear vector angle was 17 degrees A degrees. Interpretation This study of metal-meshed hip-simulated acetabular cups shows that CT has the capacity for reliable measurement of linear wear of acetabular cups at a clinically relevant level of accuracy.
Place, publisher, year, edition, pages
2011. Vol. 82, no 1, 35-41 p.
Total Hip-Arthroplasty, Semiautomated Program, Component Migration, Computed-Tomography, Fusion, Repeatability, Penetration, Time
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-31654DOI: 10.3109/17453674.2011.552777ISI: 000287025400006PubMedID: 21281259ScopusID: 2-s2.0-79751483254OAI: oai:DiVA.org:kth-31654DiVA: diva2:405079
QC 201103212011-03-212011-03-212015-06-24Bibliographically approved