Accuracy of a CT-based bone contour registration method to measure relative bone motions in the hindfoot |
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| Authors: | G.J.M. Tuijthof L. Beimers R. Jonges E.R. Valstar L. Blankevoort |
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| Affiliation: | 1. Department of Biomedical Engineering & Physics, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands;2. Digisens R&D, Le Bourget-du-Lac, France;1. Department of Surgery, University of Western Ontario, London, ON, Canada;2. Wolf Orthopaedic Biomechanics Laboratory, Fowler Kennedy Sport Medicine Clinic, University of Western Ontario, London, ON, Canada;3. Department of Orthopaedic Surgery, Centre Hospitalier de Luxembourg, Luxembourg;4. Imaging Research Laboratories, Robarts Research Institute, University of Western Ontario, London, ON, Canada;5. School of Physical Therapy, Faculty of Health Sciences, University of Western Ontario, London, ON, Canada |
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| Abstract: | 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° for rotation about the helical axis, and 0.20 mm 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 3.3 mm and 2.4°, 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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