Low dose CT-based spatial analysis (CTSA) to measure implant migration after ceramic hip resurfacing arthroplasty (HRA): a phantom study
File(s)
Published version
Author(s)
Clarke, Susannah G
Logishetty, Kartik
Halewood, Camilla
Cobb, Justin P
Type
Journal Article
Abstract
Implant migration is a predictor of arthroplasty survivorship. It is crucial to monitor the migration of novel hip prostheses within premarket clinical investigations. RSA is the gold standard method, but requires calibrated radiographs using specialised equipment. A commercial computed tomography micromotion analysis solution is a promising alternative but is not yet available for use with monobloc ceramic implants. This study aimed to develop and validate a CT-based spatial analysis (CTSA) method for use with ceramic implants. A phantom study was undertaken to assess accuracy and precision. A ceramic hip resurfacing arthroplasty (HRA) and 20 tantalum beads were implanted into a synthetic hip model and mounted onto a 6-degree of freedom motion stage. The hip was repeatedly scanned with a low dose CT protocol, with imposed micromovements. Data were interrogated using a semiautomated technique. The effective radiation dose for each scan was estimated to be 0.25 mSv. For the head implant, precision ranged between 0.11 and 0.28 mm for translations and 0.34°-0.42° for rotations. For the cup implant, precision ranged between 0.08 and 0.11 mm and 0.19° and 0.42°. For the head, accuracy ranged between 0.04 and 0.18 mm for translations and 0.28°-0.46° for rotations. For the cup, accuracy ranged between 0.04 and 0.08 mm and 0.17° and 0.43°. This in vitro study demonstrates that low dose CTSA of a ceramic HRA is similar in accuracy to RSA. CT is ubiquitous, and this method may be an alternative to RSA to measure prosthesis migration.
Date Issued
2023-03
Date Acceptance
2023-01-05
Citation
Proceedings of the Institution of Mechanical Engineers Part H: Journal of Engineering in Medicine, 2023, 237 (3), pp.359-367
ISSN
0954-4119
Publisher
SAGE Publications
Start Page
359
End Page
367
Journal / Book Title
Proceedings of the Institution of Mechanical Engineers Part H: Journal of Engineering in Medicine
Volume
237
Issue
3
Copyright Statement
© IMechE 2023. This work is published under a CC BY licence.
License URL
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/36772975
Subjects
Biomedical devices
computed tomography (CT) analysis
hip protheses
imaging (medical)
implant migration
implants/prosthetics
photogrammetry/stereo photogrammetry (medical)
Publication Status
Published
Coverage Spatial
England
Date Publish Online
2023-02-11