| Accuracy of a CT-based bone contour registration method to measure relative bone motions in the hindfoot. | |
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MedLine Citation:
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PMID: 19261282 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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For measuring the in-vivo range of motion of the hindfoot, a CT-based bone contour registration method (CT-BCM) was developed to determine the three-dimensional position and orientation of bones. To validate this technique, we hypothesized that the range of motion in the hindfoot is equally, accurately measured by roentgen stereophotogrammetric analysis (RSA) as by the CT-BCM technique. Tantalum bone markers were placed in the distal tibia, talus and calcaneus of one cadaver specimen. With a fixed lower leg, the cadaveric foot was held in neutral and subsequently loaded in eight extreme positions. Immediately after acquiring a CT-scan with the foot in a position, RSA radiographs were made. Bone contour registration and RSA was performed. Helical axis parameters were calculated for talocrural and subtalar joint motion from neutral to extreme positions and between opposite extreme positions. Differences between CT-BCM and RSA were calculated. Compared with RSA, the CT-BCM data registered an overall root mean square difference (RMSd) of 0.21 degrees for rotation about the helical axis, and 0.20mm translation along the helical axis for the talocrural and subtalar joint and for all motions combined. The RMSd of the position and direction of the helical axes was 3.3mm and 2.4 degrees , respectively. The latter errors were larger with smaller helical rotations. The differences are similar to those reported for validated RSA and thus are not clinically relevant. Concluding, CT-BCM is an accurate and accessible alternative for studying joint motion, as it does not have the risk of infection and overlapping bone markers. |
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Authors:
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G J M Tuijthof; L Beimers; R Jonges; E R Valstar; L Blankevoort |
Publication Detail:
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Type: Journal Article Date: 2009-03-03 |
Journal Detail:
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Title: Journal of biomechanics Volume: 42 ISSN: 1873-2380 ISO Abbreviation: J Biomech Publication Date: 2009 Apr |
Date Detail:
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Created Date: 2009-03-30 Completed Date: 2009-05-18 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0157375 Medline TA: J Biomech Country: United States |
Other Details:
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Languages: eng Pagination: 686-91 Citation Subset: IM |
Affiliation:
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Orthopaedic Research Center Amsterdam (ORCA), Department of Orthopaedic Surgery, Academic Medical Centre, G4 243 Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands. g.j.tuijthof@amc.uva.nl |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Bone and Bones / physiology*, radiography* Foot / physiology*, radiography* Humans Male Movement / physiology* Tomography, X-Ray Computed / instrumentation*, methods* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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