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Are CT Scans a Satisfactory Substitute for the Follow-Up of RSA Migration Studies of Uncemented Cups?: A Comparison of RSA Double Examinations and CT Datasets of 46 Total Hip Arthroplasties
Department of Surgical and Perioperative Sciences (Institutionen för kirurgisk och perioperativ vetenskap), Umeå University, Umeå, Sweden.
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).ORCID iD: 0000-0002-6066-746X
New York University, Department of Radiology. (Nuclear Medicine)ORCID iD: 0000-0002-2442-1622
University of Utah. (School of Computing, College of Engineering)ORCID iD: 0000-0002-0706-1805
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2017 (English)In: BioMed Research International, ISSN 2314-6133, E-ISSN 2314-6141, Vol. 2017, p. 1-11, article id 3681458Article in journal (Refereed) Published
Abstract [en]

As part of the 14-year follow-up of a prospectively randomized radiostereometry (RSA) study on uncemented cup fixation, two pairs of stereo radiographs and a CT scan of 46 hips were compared. Tantalum beads, inserted during the primary operation, were detected in the CT volume and the stereo radiographs and used to produce datasets of 3D coordinates. The limit of agreement between the combined CT and RSA datasets was calculated in the same way as the precision of the double RSA examination. The precision of RSA corresponding to the 99% confidence interval was 1.36°, 1.36°, and 0.60° for -, -, and -rotation and 0.40, 0.17, and 0.37 mm for -, -, and -translation. The limit of agreement between CT and RSA was 1.51°, 2.17°, and 1.05° for rotation and 0.59, 0.56, and 0.74 mm for translation. The differences between CT and RSA are close to the described normal 99% confidence interval for precision in RSA: 0.3° to 2° for rotation and 0.15 to 0.6 mm for translation. We conclude that measurements using CT and RSA are comparable and that CT can be used for migration studies for longitudinal evaluations of patients with RSA markers.

Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2017. Vol. 2017, p. 1-11, article id 3681458
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Orthopaedics
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URN: urn:nbn:se:kth:diva-200362DOI: 10.1155/2017/3681458ISI: 000394010400001OAI: oai:DiVA.org:kth-200362DiVA, id: diva2:1068493
Note

QC 20170130

Available from: 2017-01-25 Created: 2017-01-25 Last updated: 2018-01-13Bibliographically approved

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Maguire Jr., Gerald Q.Noz, Marilyn E.Zeleznik, Michael P.
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