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A new CT method for measuring cup orientation after total hip arthroplasty: A study of 10 patients
Karolinska Institute, Department of Molecular Medicine and Surgery.
Karolinska Institute, Department of Molecular Medicine and Surgery.
Karolinska Institutet, Department of Clinical Science, Intervention and Technology, Division of Radiology.
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2004 (English)In: Acta Orthopaedica Scandinavica, ISSN 0001-6470, Vol. 75, no 3, 252-260 p.Article in journal (Refereed) Published
Abstract [en]

Background It is difficult to assess the orientation of the acetabular component on routine radiographs. We present a method for determining the spatial orientation of the acetabular component after total hip arthroplasty (THA) using computed tomography. Patients and methods Two CT-scans, 10 min apart, were obtained from each of 10 patients after THA. Using locally developed software, two independent examiners measured the orientation of the acetabular component in relation to the pelvis. The measurements were repeated after one week. To be independent of the patient position during scanning, the method involved two steps. Firstly, a 3D volumetric image of the pelvis was brought into a standard pelvic orientation, then the orientation of the acetabular component was measured. The orientation of the acetabular component was expressed as operative anteversion and inclination relative to an internal pelvic reference coordinate system. To evaluate precision, we compared measurements across pairs of CT volumes between observers and trials. Results Mean absolute interobserver angle error was 2.3degrees for anteversion (range 0-6.6degrees), and 1.1degrees for inclination (range 0-4.6degrees). For interobserver measurements, the precision, defined as one standard deviation, was 2.9degrees for anteversion, and 1.5degrees for inclination. A Student's West showed that the overall differences between the examiners, trials, and cases were not significant. Data were normally distributed and were not dependent on examiner or trial. Interpretation We conclude that the implant angles of the acetabular component in relation to the pelvis could be detected repeatedly using CT, independently of patient positioning.

Place, publisher, year, edition, pages
2004. Vol. 75, no 3, 252-260 p.
Keyword [en]
acetabular component migration, semiautomated program, fusion, repeatability, dislocation, replacement, prosthesis
National Category
Orthopedics Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:kth:diva-23543DOI: 10.1080/00016470410001169ISI: 000222310400004Scopus ID: 2-s2.0-3042657286OAI: oai:DiVA.org:kth-23543DiVA: diva2:342241
Note
QC 20100525, QC 20111012Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Maguire Jr., Gerald Q.

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