A direct method to express the center of pressure (CoP) measured by an insole pressure sensor system (IPSS) into a known coordinate system measured by motion tracking equipment is presented. A custom probe was constructed with reflective markers to allow its tip to be precisely tracked with motion tracking equipment. This probe was utilized to activate individual sensors on an IPSS that was placed in a shoe fitted with reflective markers used to establish a local shoe coordinate system. When pressed onto the IPSS the location of the probe's tip was coincident with the CoP measured by the IPSS (IPSS-CoP). Two separate pushes (i.e., data points) were used to develop vectors in each respective coordinate system. Simple vector mathematics determined the rotational and translational components of the transformation matrix needed to express the IPSS-CoP into the local shoe coordinate system. Validation was performed by comparing IPSS-CoP with an embedded force plate measured CoP (FP-CoP) from data gathered during kinematic trials. Six male subjects stood on an embedded FP and performed anterior/posterior (AP) sway, internal rotation, and external rotation of the body relative to a firmly planted foot. The IPSS-CoP was highly correlated with the FP-CoP for all motions, root mean square errors (RMSRRs) were comparable to other research, and there were no statistical differences between the displacement of the IPSS-CoP and FP-CoP for both the AP and medial/lateral (ML) axes, respectively. The results demonstrated that this methodology could be utilized to determine the transformation variables need to express IPSS-CoP into a known coordinate system measured by motion tracking equipment and that these variables can be determined outside the laboratory anywhere motion tracking equipment is available.
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June 2016
Research-Article
A Direct Method for Mapping the Center of Pressure Measured by an Insole Pressure Sensor System to the Shoe's Local Coordinate System
Brian T. Weaver,
Brian T. Weaver
Mem. ASME
Orthopaedic Biomechanics Laboratories,
Michigan State University,
A407 East Fee Hall,
East Lansing, MI 48824;
Orthopaedic Biomechanics Laboratories,
Michigan State University,
A407 East Fee Hall,
East Lansing, MI 48824;
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Jerrod E. Braman,
Jerrod E. Braman
Orthopaedic Biomechanics Laboratories, Michigan State University,
A407 East Fee Hall,
East Lansing, MI 48824
e-mail: Bramanj1@msu.edu
A407 East Fee Hall,
East Lansing, MI 48824
e-mail: Bramanj1@msu.edu
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Roger C. Haut
Roger C. Haut
Fellow ASME
Orthopaedic Biomechanics Laboratories,
Michigan State University,
A407 East Fee Hall,
East Lansing, MI 48824
e-mail: Roger@msu.edu
Orthopaedic Biomechanics Laboratories,
Michigan State University,
A407 East Fee Hall,
East Lansing, MI 48824
e-mail: Roger@msu.edu
Search for other works by this author on:
Brian T. Weaver
Mem. ASME
Orthopaedic Biomechanics Laboratories,
Michigan State University,
A407 East Fee Hall,
East Lansing, MI 48824;
Orthopaedic Biomechanics Laboratories,
Michigan State University,
A407 East Fee Hall,
East Lansing, MI 48824;
Jerrod E. Braman
Orthopaedic Biomechanics Laboratories, Michigan State University,
A407 East Fee Hall,
East Lansing, MI 48824
e-mail: Bramanj1@msu.edu
A407 East Fee Hall,
East Lansing, MI 48824
e-mail: Bramanj1@msu.edu
Roger C. Haut
Fellow ASME
Orthopaedic Biomechanics Laboratories,
Michigan State University,
A407 East Fee Hall,
East Lansing, MI 48824
e-mail: Roger@msu.edu
Orthopaedic Biomechanics Laboratories,
Michigan State University,
A407 East Fee Hall,
East Lansing, MI 48824
e-mail: Roger@msu.edu
1Corresponding author.
Manuscript received September 9, 2015; final manuscript received April 11, 2016; published online May 5, 2016. Assoc. Editor: Kristen Billiar.
J Biomech Eng. Jun 2016, 138(6): 061007 (7 pages)
Published Online: May 5, 2016
Article history
Received:
September 9, 2015
Revised:
April 11, 2016
Citation
Weaver, B. T., Braman, J. E., and Haut, R. C. (May 5, 2016). "A Direct Method for Mapping the Center of Pressure Measured by an Insole Pressure Sensor System to the Shoe's Local Coordinate System." ASME. J Biomech Eng. June 2016; 138(6): 061007. https://doi.org/10.1115/1.4033476
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