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Spatial component position in total hip arthroplasty - Accuracy and repeatability with a new CT method
Soder Sjukhuset, Dept Hand Surgery.
Karolinska Hosp, Dept Orthoped.
Karolinska Hosp, Dept Radiologyy.
New York University, Department of Radiology. (Nuclear Medicine)
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2003 (English)In: Acta Radiologica, ISSN 0284-1851, E-ISSN 1600-0455, Vol. 44, no 1, 84-91 p.Article in journal (Refereed) Published
Abstract [en]

Purpose: 3D detection of centerpoints of prosthetic cup and head after total hip arthroplasty (THA) using CT. Material and Methods: Two CT examinations, 10 min apart, were obtained from each of 10 patients after THA. Two independent examiners placed landmarks in images of the prosthetic cup and head. All landmarking was repeated after 1 week. Centerpoints were calculated and compared. Results: Within volumes, all measurements of centerpoints of cup and head fell, with a 95% confidence, within one CT-voxel of any other measurement of the same object. Across two volumes, the mean error of distance between center of cup and prosthetic head was 1.4 mm (SD 0.73). Intra- and interobserver 95% accuracy limit was below 2 mm within and below 3 mm across volumes. No difference between intra- and interobserver measurements occurred. A formula for converting finite sets of point landmarks in the radiolucent tread of the cup to a centerpoint was stable. The percent difference of the landmark distances from a calculated spherical surface was within one CT-voxel. This data was normally distributed and not dependent on observer or trial. Conclusion: The true 3D position of the centers of cup and prosthetic head can be detected using CT. Spatial relationship between the components can be analyzed visually and numerically.

Place, publisher, year, edition, pages
2003. Vol. 44, no 1, 84-91 p.
Keyword [en]
hip arthroplasty, CT, replacement
National Category
Orthopedics Radiology, Nuclear Medicine and Medical Imaging
Research subject
URN: urn:nbn:se:kth:diva-22312DOI: 10.1046/j.0284-1851.2002.021.xISI: 000181509900017OAI: diva2:341010
QC 20100525 NR 20140804Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2013-09-09Bibliographically approved

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