| Validation of a CT image based software for three-dimensional measurement of acetabular cup orientation. | |
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MedLine Citation:
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PMID: 21957510 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of our study was to develop a simple and reproducible method for calculating post-operative acetabular cup position based upon computed tomographic images. Next, we sought to examine the reliability, objectivity and accuracy of this method. We developed a 3D CT evaluation software based upon Amira® (data visualisation, analysis and modelling software) to calculate the abduction and anteversion of the acetabular cup relative to the APP (anterior pelvic plane). To test the accuracy of the method, we constructed a special phantom pelvic model as the gold standard, in which the acetabulum was mounted at various abduction and anteversion angles that had previously been measured digitally. This phantom was then CT scanned in 12 different cup positions (30° to 50° abduction, 0° to 30° anteversion) and then evaluated using the 3D CT evaluation software. In addition, we also examined the reliability and objectivity of this method in 10 patients following implantation of a hip prosthesis, as a clinical trial. We observed an average accuracy of the 3D CT evaluation software of −0.3° (range −1.4° to 1.3°; SD 0.6°) for abduction and 0.2° (range −1.4° to 1.4°; SD 0.6°) for anteversion compared with the gold standard. Moreover, a high intra -and interindividual agreement in the resulting ICC well above 0.8 for abduction and abduction values in the phantom study and the clinical trial were observed. This study found that the 3D CT evaluation software provides high reliability, objectivity and accuracy. Thus, the 3D CT software is a method that permits very precise evaluation of the post-operative cup position independent of patient positioning or pelvic tilt. |
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Authors:
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Georgi I Wassilew; Viktor Janz; Markus Heller; Marcus Wenzl; Carsten Perka; Olaf Hasart |
Publication Detail:
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Type: Journal Article; Validation Studies |
Journal Detail:
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Title: Technology and health care : official journal of the European Society for Engineering and Medicine Volume: 19 ISSN: 1878-7401 ISO Abbreviation: Technol Health Care Publication Date: 2011 |
Date Detail:
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Created Date: 2011-09-29 Completed Date: 2011-09-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9314590 Medline TA: Technol Health Care Country: Netherlands |
Other Details:
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Languages: eng Pagination: 185-93 Citation Subset: IM |
Affiliation:
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Charité, Universitätsmedizin Berlin, Center for Musculoskeletal Surgery Berlin, Orthopaedic Department, Berlin, Germany. georgi.wassilew@charite.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acetabulum
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radiography* Humans Imaging, Three-Dimensional Pelvis Posture Reproducibility of Results Software* Tomography, X-Ray Computed / methods* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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