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Model studies on segmental movement in lumbar spine using a semi-automated program for volume fusion
Karolinska Institute, Department Orthopaed..
Karolinska Institute, Department of Molecular Medicine and Surgery.
Karolinska Institute, Department of Molecular Medicine and Surgery.
Lowenstromska Sjukhuset, Stockholm Spine Ctr, Upplands Vasby, Sweden .
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2008 (English)In: Journal of Computer-Aided Surgery, ISSN 1092-9088, E-ISSN 1097-0150, Vol. 13, no 1, 14-22 p.Article in journal (Refereed) Published
Abstract [en]

Objective: To validate a new non-invasive CT method for measuring segmental translations in lumbar spine in a phantom using plastic vertebrae with tantalum markers and human vertebrae. Material and Methods: One hundred and four CT volumes were acquired of a phantom incorporating three lumbar vertebrae. Lumbar segmental translation was simulated by altering the position of one vertebra in all three cardinal axes between acquisitions. The CT volumes were combined into 64 case pairs, simulating lumbar segmental movement of up to 3 mm between acquisitions. The relative movement between the vertebrae was evaluated visually and numerically using a volume fusion image post-processing tool. Results were correlated to direct measurements of the phantom. Results: On visual inspection, translation of at least 1 mm or more could be safely detected and correlated with separation between the vertebrae in three dimensions. There were no significant differences between plastic and human vertebrae. Numerically, the accuracy limit for all the CT measurements of the 3D segmental translations was 0.56 mm (median: 0.12; range: -0.76 to +0.49 mm). The accuracy for the sagittal axis was 0.45 mm (median: 0.10; range: -0.46 to +0.62 mm); the accuracy for the coronal axis was 0.46 min (median: 0.09; range: -0.66 to +0.69 mm); and the accuracy for the axial axis was 0.45 mm (median: 0.05; range: -0.72 to +0.62 mm). The repeatability, calculated over 10 cases, was 0.35 mm (median: 0.16; range: -0.26 to +0.30 mm). Conclusion: The accuracy of this non-invasive method is better than that of current routine methods for detecting segmental movements. The method allows both visual and numerical evaluation of such movements. Further studies are needed to validate this method in patients.

Place, publisher, year, edition, pages
London, UK: Informa Healthcare, 2008. Vol. 13, no 1, 14-22 p.
Keyword [en]
lumbar spine, volume fusion, model study, segmental movement, total hip-arthroplasty, flexion-extension, motion, ct, repeatability, accuracy
National Category
Orthopedics Radiology, Nuclear Medicine and Medical Imaging
Research subject
URN: urn:nbn:se:kth:diva-17560DOI: 10.1080/10929080701882549ISI: 000256165100002ScopusID: 2-s2.0-38849154398OAI: diva2:335604
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2013-09-09Bibliographically approved

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Maguire, Gerald Q. Jr.
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Communication Systems, CoS
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