Journal article
Mechanics of the ankle and subtalar joints revealed through a 3D quasi-static stress MRI technique
Journal of biomechanics, v 38(3), pp 567-578
2005
PMID: 15652556
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Abstract
A technique to study the three-dimensional (3D) mechanical characteristics of the ankle and of the subtalar joints in vivo and in vitro is described. The technique uses an MR scanner compatible 3D positioning and loading linkage to load the hindfoot with precise loads while the foot is being scanned. 3D image processing algorithms are used to derive from the acquired MR images bone morphology, hindfoot architecture, and joint kinematics. The technique was employed to study these properties both in vitro and in vivo. The ankle and subtler joint motion and the changes in architecture produced in response to an inversion load and an anterior drawer load were evaluated. The technique was shown to provide reliable measures of bone morphology. The left-to-right variations in bone morphology were less than 5%. The left-to-right variations in unloaded hindfoot architecture parameters were less than 10%, and these properties were only slightly affected by inversion and anterior drawer loads. Inversion and anterior drawer loads produced motion both at the ankle and at the subtalar joint. In addition, high degree of coupling, primarily of internal rotation with inversion, was observed both at the ankle and at the subtalar joint. The in vitro motion produced in response to inversion and anterior drawer load was greater than the in vivo motion. Finally, external motion, measured directly across the ankle complex, produced in response to load was much greater than the bone movements measured through the 3D stress MRI technique indicating the significant effect of soft tissue and skin interference.
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Details
- Title
- Mechanics of the ankle and subtalar joints revealed through a 3D quasi-static stress MRI technique
- Creators
- S Siegler - Department of Mechanical Engineering and Mechanics Drexel University 32nd and Chestnut Streets, Philadelphia, PA 19104, USAJ.K Udupa - Medical Image Processing Group, Department of Radiology University of Pennsylvania, Philadelphia, PA 19104, USAS.I Ringleb - Department of Mechanical Engineering and Mechanics Drexel University 32nd and Chestnut Streets, Philadelphia, PA 19104, USAC.W Imhauser - Department of Mechanical Engineering and Mechanics Drexel University 32nd and Chestnut Streets, Philadelphia, PA 19104, USAB.E Hirsch - Department of Neurobiology and Anatomy Drexel University Philadelphia, PA 19104, USAD Odhner - Medical Image Processing Group, Department of Radiology University of Pennsylvania, Philadelphia, PA 19104, USAP.K Saha - Medical Image Processing Group, Department of Radiology University of Pennsylvania, Philadelphia, PA 19104, USAE Okereke - Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA 19104, USAN Roach - Medical Image Processing Group, Department of Radiology University of Pennsylvania, Philadelphia, PA 19104, USA
- Publication Details
- Journal of biomechanics, v 38(3), pp 567-578
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000226884200021
- Scopus ID
- 2-s2.0-12344281143
- Other Identifier
- 991014877770104721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Biophysics
- Engineering, Biomedical