Document Detail


Motion-derived coordinate systems reduce inter-subject variability of elbow flexion kinematics.
MedLine Citation:
PMID:  20957744     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The selection of a joint coordinate system affects the outcome of motion pathways. We developed coordinate systems for the ulna and humerus, which are generated from upper extremity motion. These Motion-Derived Coordinate Systems (CS) were compared to traditional Anatomy-Derived CS created using surface digitizations of anatomical features. Within-subject repeatability of creating Motion-Derived CS was quantified. In vitro elbow flexion was generated in the gravity-dependent position using an active upper extremity motion simulator. Kinematic pathways of those motions were calculated in terms of valgus angulation and internal rotation of the ulna relative to the humerus, using both CS. The method of creating Motion-Derived CS was highly repeatable-less than 0.5 mm and 1° for all coordinate directions measured. Inter-subject variability of active flexion pathways was reduced with Motion-Derived CS compared to Anatomy-Derived CS (p < 0.05). The decrease in inter-subject kinematic variability when using Motion-Derived CS may increase the statistical power of biomechanical studies and allow for reduced sample sizes. This minimally invasive method, which also determines the elbow flexion and forearm rotation axes and center of the capitellum, may also be applicable in computer-navigated surgery of the upper limb. © 2010 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 29:596-601, 2011.
Authors:
Louis M Ferreira; Graham J W King; James A Johnson
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Publication Detail:
Type:  Journal Article     Date:  2010-10-18
Journal Detail:
Title:  Journal of orthopaedic research : official publication of the Orthopaedic Research Society     Volume:  29     ISSN:  1554-527X     ISO Abbreviation:  J. Orthop. Res.     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-02-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8404726     Medline TA:  J Orthop Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  596-601     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Orthopaedic Research Society.
Affiliation:
Bioengineering Research Laboratory, The Hand and Upper Limb Centre, St. Joseph's Health Care London, London, Ontario, Canada.
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