Development and validation of an automated and marker-free CT-based spatial analysis method (CTSA) for assessment of femoral hip implant migration In vitro accuracy and precision comparable to that of radiostereometric analysis (RSA).
Background and purpose — We developed a marker-free automated CT-based spatial analysis (CTSA) method to detect stem-bone migration in consecutive CT datasets and assessed the accuracy and precision in vitro. Our aim was to demonstrate that in vitro accuracy and precision of CTSA is comparable to th...
| Published in: | Acta Orthopaedica Vol. 87; no. 2; pp. 139 - 146 |
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| Main Authors: | , , , , , |
| Format: | diagnostic images pictorial research tables/charts Journal Article |
| Published: |
Medical Journals Sweden AB
Apr2016
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=114014461&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 114014461 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 17453674 1BVL jtl: Acta Orthopaedica issn: 17453674 maglogo: N pubinfo: dt: Apr2016 vid: 87 iid: 2 pid: 59195 pub: Medical Journals Sweden AB artinfo: ui: 114014461 114014461 114014461 10.3109/17453674.2015.1123569 114014461 ppf: 139 ppct: 7 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: Development and validation of an automated and marker-free CT-based spatial analysis method (CTSA) for assessment of femoral hip implant migration In vitro accuracy and precision comparable to that of radiostereometric analysis (RSA). aug: au: Scheerlinck, Thierry Polfliet, Mathias Deklerck, Rudi Van Gompel, Gert Buls, Nico Vandemeulebroucke, Jef affil: Department or Orthopedic Surgery and Traumatology, Universitair Ziekenhuis Brussel, Brussels sug: subj: Tomography, X-Ray Computed Methods Prosthesis Failure Radiography Prostheses and Implants Femur Radiography Hip Radiography Human Validity Precision Radiostereometric Analysis In Vitro Studies Validation Studies Orthopedic Fixation Devices Dislocations Rotation Descriptive Statistics Comparative Studies ab: Background and purpose — We developed a marker-free automated CT-based spatial analysis (CTSA) method to detect stem-bone migration in consecutive CT datasets and assessed the accuracy and precision in vitro. Our aim was to demonstrate that in vitro accuracy and precision of CTSA is comparable to that of radiostereometric analysis (RSA). Material and methods — Stem and bone were segmented in 2 CT datasets and both were registered pairwise. The resulting rigid transformations were compared and transferred to an anatomically sound coordinate system, taking the stem as reference. This resulted in 3 translation parameters and 3 rotation parameters describing the relative amount of stem-bone displacement, and it allowed calculation of the point of maximal stem migration. Accuracy was evaluated in 39 comparisons by imposing known stem migration on a stem-bone model. Precision was estimated in 20 comparisons based on a zero-migration model, and in 5 patients without stem loosening. Results — Limits of the 95% tolerance intervals (TIs) for accuracy did not exceed 0.28 mm for translations and 0.20° for rotations (largest standard deviation of the signed error (SDSE): 0.081 mm and 0.057°). In vitro, limits of the 95% TI for precision in a clinically relevant setting (8 comparisons) were below 0.09 mm and 0.14° (largest SDSE: 0.012 mm and 0.020°). In patients, the precision was lower, but acceptable, and dependent on CT scan resolution. Interpretation — CTSA allows detection of stem-bone migration with an accuracy and precision comparable to that of RSA. It could be valuable for evaluation of subtle stem loosening in clinical practice. pubtype: Academic Journal doctype: diagnostic images pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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