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Inducible displacement CT increases the diagnostic accuracy of aseptic loosening in primary total hip arthroplasty by Olof Sandberg; Sofia Carlsson; Ellen Harbom; Vendela Cappelen; Simon Tholén; Henrik Olivecrona; Per Wretenberg is a Medicine article available to read on EtoBox.

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## Background and purpose Inducible displacement CT compares 2 CTs acquired in series but with alternated rotation of the femur. This provides visual and quantitative clues as to the mechanical situation, i.e., loosening, of a total hip arthroplasty. We report the accuracy of this method as well as the experience of integrating it into a clinical workflow. ## Patients and methods This was a retrospective single centre study of 72 cases of suspected aseptic loosening were the surgeon after reviewing a standard plain radiograph saw a need for more information. The displacement CT and plain radiograph were compared either to intraoperative findings or a 1–3 year follow up questionnaire for patients that did not have revision surgery. Patients reporting degradation in status since the time of the displacement CT were called for a follow up plain radiograph. Sensitivity and specificity were assessed, and user experience gathered. ## Results Of 72 enrolled patients 15 were lost to follow-up. Of the remaining 57, 17 were judged by in-traoperative findings or follow-up to have had loose implants. For plain radiography the sensitivity and specificity were 59% (95% CI 35–82) and 85% (74–96).

Who reads Inducible displacement CT increases the diagnostic accuracy of aseptic loosening in primary total hip arthroplasty?

Author

Olof Sandberg; Sofia Carlsson; Ellen Harbom; Vendela Cappelen; Simon Tholén; Henrik Olivecrona; Per Wretenberg

Publisher

Medical Journals Sweden AB

Published

2022

Language

EN

Field

Medicine (Health Sciences)