Document Detail

Functional calibration procedure for 3D knee joint angle description using inertial sensors.
MedLine Citation:
PMID:  19665712     Owner:  NLM     Status:  MEDLINE    
Measurement of three-dimensional (3D) knee joint angle outside a laboratory is of benefit in clinical examination and therapeutic treatment comparison. Although several motion capture devices exist, there is a need for an ambulatory system that could be used in routine practice. Up-to-date, inertial measurement units (IMUs) have proven to be suitable for unconstrained measurement of knee joint differential orientation. Nevertheless, this differential orientation should be converted into three reliable and clinically interpretable angles. Thus, the aim of this study was to propose a new calibration procedure adapted for the joint coordinate system (JCS), which required only IMUs data. The repeatability of the calibration procedure, as well as the errors in the measurement of 3D knee angle during gait in comparison to a reference system were assessed on eight healthy subjects. The new procedure relying on active and passive movements reported a high repeatability of the mean values (offset<1 degrees) and angular patterns (SD<0.3 degrees and CMC>0.9). In comparison to the reference system, this functional procedure showed high precision (SD<2 degrees and CC>0.75) and moderate accuracy (between 4.0 degrees and 8.1 degrees) for the three knee angle. The combination of the inertial-based system with the functional calibration procedure proposed here resulted in a promising tool for the measurement of 3D knee joint angle. Moreover, this method could be adapted to measure other complex joint, such as ankle or elbow.
J Favre; R Aissaoui; B M Jolles; J A de Guise; K Aminian
Publication Detail:
Type:  Evaluation Studies; Journal Article     Date:  2009-08-08
Journal Detail:
Title:  Journal of biomechanics     Volume:  42     ISSN:  1873-2380     ISO Abbreviation:  J Biomech     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-10-05     Completed Date:  2010-01-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2330-5     Citation Subset:  IM    
Ecole Polytechnique F??d??rale de Lausanne (EPFL), Laboratory of Movement Analysis and Measurement, Lausanne, Switzerland.
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MeSH Terms
Equipment Design
Equipment Failure Analysis
Imaging, Three-Dimensional / instrumentation*
Knee Joint / anatomy & histology*,  physiology*
Monitoring, Ambulatory / instrumentation*
Range of Motion, Articular / physiology*
Reproducibility of Results
Sensitivity and Specificity
Walking / physiology
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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