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Accuracy and precision of a CT method for assessing migration in shoulder arthroplasty: an experimental study
Department of Surgery and Cancer, Imperial College London, St Mary’s Hospital, London, UK2Karolinska Institutet, Department of Clinical Sciences, Danderyd Hospital, Division of Orthopaedics, Stockholm, Sweden.ORCID-id: 0000-0002-9801-2733
Department of Mechanical Engineering, University of Victoria, Victoria, BC, Canada4Mechatronics in Medicine Laboratory, Mechanical Engineering, Imperial College London, London, UK.
Department of Bioengineering, Imperial College London, London, UK.
Department of Radiology, St Mary’s Hospital, Imperial College Healthcare NHS Trust, London, UK.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Acta Radiologica, ISSN 0284-1851, E-ISSN 1600-0455Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Background: Radiostereometric analysis (RSA) is the gold standard to measure early implant migration which is a predictive factor for implant survival. Purpose: To validate an alternative computed tomography (CT) technique to measure implant migration in shoulder arthroplasty. Material and Methods: A cadaver proximal humerus and a scapula, which had tantalum beads incorporated within them, were prepared to accept a short-stemmed humeral component and a two-pegged glenoid component of a commercial total shoulder arthroplasty (TSA) system. A five degree of freedom micrometer and goniometer equipped rig was used to translate and rotate the implant components relative to the respective bone to predetermined positions. Double CT examinations were performed for each position and CT motion analysis software (CTMA) was used to assess these movements. The accuracy and precision of the software was estimated using the rig’s micrometers and goniometers as the gold standard. The technique’s effective dose was also assessed. Results: The accuracy was in the range of 0.07–0.23 mm in translation and 0.22–0.71° in rotation. The precision was in the range of 0.08–0.15 mm in translation and 0.23–0.54° in rotation. The mean effective dose for the CT scans was calculated to be 0.27 mSv. Conclusion: In this experimental setting, accuracy, precision, and effective dose of the CTMA technique were found to be comparable to that of RSA. Therefore, we believe clinical studies are warranted to determine if CTMA is a suitable alternative to traditional RSA for migration measurements in TSA.

sted, utgiver, år, opplag, sider
Sage Publications, 2019.
Emneord [en]
Computed tomography, radiostereometric analysis, shoulder arthroplasty, total shoulder replacement, migration
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-263294DOI: 10.1177/0284185119882659PubMedID: 31684750Scopus ID: 2-s2.0-85074841689OAI: oai:DiVA.org:kth-263294DiVA, id: diva2:1367981
Merknad

QC 20191204

PMID: 31684750

Tilgjengelig fra: 2019-11-05 Laget: 2019-11-05 Sist oppdatert: 2020-03-09bibliografisk kontrollert

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Brodén, CyrusOlivecrona, HenrikMaguire Jr., Gerald Q.Noz, Marilyn E.
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