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In vivo and ex vivo measurement of polyethylene wear in total hip arthroplasty
Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston MA, United States .
Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston MA, United States .
New York University, Department of Radiology. (Nuclear Medicine)ORCID iD: 0000-0002-2442-1622
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).ORCID iD: 0000-0002-6066-746X
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2014 (English)In: Acta Orthopaedica, ISSN 1745-3674, E-ISSN 1745-3682, Vol. 85, no 3, 271-275 p.Article in journal (Refereed) Published
Abstract [en]

Background - Determination of the amount of wear in a polyethylene liner following total hip arthroplasty (THA) is important for both the clinical care of individual patients and the development of new types of liners. Patients and methods - We measured in vivo wear of the polyethylene liner using computed tomography (CT) (obtained in the course of regular clinical care) and compared it to coordinate-measuring machine (CMM) readings. Also, changes in liner thickness of the same retrieved polyethylene liner were measured using a micrometer, and were compared to CT and CMM measurements. The distance between the centers of the acetabular cup and femoral head component was measured in 3D CT, using a semi-automatic analysis method. CMM readings were performed on each acetabular liner and data were analyzed using 3D computer-aided design software. Micrometer readings compared the thickest and thinnest regions of the liner. We analyzed 10 THA CTs and retrievals that met minimal requirements for CT slice thickness and explanted cup condition. Results - For the 10 cups, the mean difference between the CT readings and the CMM readings was -0.09 (-0.38 to 0.20) mm. This difference was not statistically significant (p = 0.6). Between CT and micrometer, the mean difference was 0.11 (-0.33 to 0.55) mm. This difference was not statistically significant (p = 0.6). Interpretation - Our results show that CT imaging is ready to be used as a tool in clinical wear measurement of polyethylene liners used in THA.

Place, publisher, year, edition, pages
2014. Vol. 85, no 3, 271-275 p.
Keyword [en]
Cross-Linked Polyethylene, Computed-Tomography, CT, Trial
National Category
Orthopedics
Identifiers
URN: urn:nbn:se:kth:diva-147985DOI: 10.3109/17453674.2014.913225ISI: 000337845000011PubMedID: 24758322Scopus ID: 2-s2.0-84902653490OAI: oai:DiVA.org:kth-147985DiVA: diva2:733621
Note

QC 20140807

Available from: 2014-07-10 Created: 2014-07-10 Last updated: 2017-12-05Bibliographically approved

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

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