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A potential means of improving the evaluation of deformity corrections with Taylor Spatial Frames over time by using volumetric imaging: Preliminary results
New York University School of Medicine, Department of Radiology.
Karolinska Institute, Department of Molecular Medicine and Surgery.
New York University, Department of Radiology. (Nuclear Medicine)
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.ORCID iD: 0000-0002-6066-746X
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2009 (English)In: Journal of Computer-Aided Surgery, ISSN 1092-9088, E-ISSN 1097-0150, Vol. 14, no 4-6, 100-108 p.Article in journal (Refereed) Published
Abstract [en]

Objective: In this study we explore the possibility of accurately and cost-effectively monitoring tibial deformation induced by Taylor Spatial Frames (TSFs), using time-separated computed tomography (CT) scans and a volume fusion technique to determine tibial rotation and translation. Materials and Methods: Serial CT examinations (designated CT-A and CT-B, separated by a time interval of several months) of two patients were investigated using a previously described and validated volume fusion technique, in which user-defined landmarks drive the 3D registration of the two CT volumes. Both patients had undergone dual osteotomies to correct for tibial length and rotational deformity. For each registration, 10 or more landmarks were selected, and the quality of the fused volume was assessed both quantitatively and via 2D and 3D visualization tools. First, the proximal frame segment and tibia in CT-A and CT-B were brought into alignment (registered) by selecting landmarks on the frame and/or tibia. In the resulting "fused'' volume, the proximal frame segment and tibia from CT-A and CT-B were aligned, while the distal frame segment and tibia from CT-A and CT-B were likely not aligned as a result of tibial deformation or frame adjustment having occurred between the CT scans. Using the proximal fused volume, the distal frame segment and tibia were then registered by selecting landmarks on the frame and/or tibia. The difference between the centroids of the final distal landmarks was used to evaluate the lengthening of the tibia, and the Euler angles from the registration were used to evaluate the rotation. Results: Both the frame and bone could be effectively registered (based on visual interpretation). Movement between the proximal frame and proximal bone could be visualized in both cases. The spatial effect on the tibia could be both visually assessed and measured: 34 mm, 10 degrees in one case; 5 mm, 1 degrees in the other. Conclusion: This retrospective analysis of spatial correction of the tibia using Taylor Spatial Frames shows that CT offers an interesting potential means of quantitatively monitoring the patient's treatment. Compared with traditional techniques, modern CT scans in conjunction with image processing provide a high-resolution, spatially correct, and three-dimensional measurement system which can be used to quickly and easily assess the patient's treatment at low cost to the patient and hospital.

Place, publisher, year, edition, pages
London, UK: Informa Healthcare , 2009. Vol. 14, no 4-6, 100-108 p.
Keyword [en]
Taylor Spatial Frame, CT volume fusion, movement evaluation, hybrid external fixation, total hip-arthroplasty, semiautomated, program, computed-tomography, tibial nonunions, proximal tibia, fusion, fractures, stability, bone
National Category
Radiology, Nuclear Medicine and Medical Imaging
Research subject
URN: urn:nbn:se:kth:diva-19110DOI: 10.3109/10929080903454969ISI: 000273553200003ScopusID: 2-s2.0-77952518306OAI: diva2:337157
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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