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Leg-orthosis contact force estimation from gait analysis.

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Title: Leg-orthosis contact force estimation from gait analysis.
Authors: Mouzo, F.1 (AUTHOR) francisco.mouzo@udc.es, Michaud, F.1 (AUTHOR) florian.michaud@udc.es, Lugris, U.1 (AUTHOR) urbano.lugris@udc.es, Cuadrado, J.1 (AUTHOR) javier.cuadrado@udc.es
Source: Mechanism & Machine Theory. Jun2020, Vol. 148, pN.PAG-N.PAG. 1p.
Subjects: Orthopedic apparatus, Torquemeters, Torque measurements, Skin injuries, Spinal cord
Abstract: • A new method to estimate leg-orthosis contact forces is proposed. • It combines motion-force captures with multibody modeling and forward dynamics. • At least one force sensor per orthosis is required. • Results suggest that active orthoses lead to lower contact forces. Spinal cord injured subjects with hip flexion ability may often walk with the help of orthosis and crutches. Typically, the orthotic devices are attached to the legs by means of several braces. Excessive pressure in such contacts may lead to skin wounds and to subsequent loss of adherence to the use of the orthoses. Since contact pressures are related to contact forces, estimation of the leg-orthosis contact forces is relevant to assess the suitability of an orthotic device for a specific subject, or to redesign the braces for pressure reduction. In this paper, a procedure to estimate such contact forces from simple gait analyses is proposed. It consists of building computational multibody models of subject and devices, and running a forward-dynamics analysis of the orthoses in which the captured motion of the subject is prescribed. At least one force/torque sensor per orthosis is required to calibrate the model. In this case, an extensometry-based load cell was used for such purpose. Results showed that, once calibrated, the model was able to reproduce torque sensor measurements for different motions. [ABSTRACT FROM AUTHOR]
Copyright of Mechanism & Machine Theory is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 142167560
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Leg-orthosis contact force estimation from gait analysis.
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  Data: <searchLink fieldCode="AR" term="%22Mouzo%2C+F%2E%22">Mouzo, F.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> francisco.mouzo@udc.es</i><br /><searchLink fieldCode="AR" term="%22Michaud%2C+F%2E%22">Michaud, F.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> florian.michaud@udc.es</i><br /><searchLink fieldCode="AR" term="%22Lugris%2C+U%2E%22">Lugris, U.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> urbano.lugris@udc.es</i><br /><searchLink fieldCode="AR" term="%22Cuadrado%2C+J%2E%22">Cuadrado, J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> javier.cuadrado@udc.es</i>
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  Data: <searchLink fieldCode="DE" term="%22Orthopedic+apparatus%22">Orthopedic apparatus</searchLink><br /><searchLink fieldCode="DE" term="%22Torquemeters%22">Torquemeters</searchLink><br /><searchLink fieldCode="DE" term="%22Torque+measurements%22">Torque measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Skin+injuries%22">Skin injuries</searchLink><br /><searchLink fieldCode="DE" term="%22Spinal+cord%22">Spinal cord</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • A new method to estimate leg-orthosis contact forces is proposed. • It combines motion-force captures with multibody modeling and forward dynamics. • At least one force sensor per orthosis is required. • Results suggest that active orthoses lead to lower contact forces. Spinal cord injured subjects with hip flexion ability may often walk with the help of orthosis and crutches. Typically, the orthotic devices are attached to the legs by means of several braces. Excessive pressure in such contacts may lead to skin wounds and to subsequent loss of adherence to the use of the orthoses. Since contact pressures are related to contact forces, estimation of the leg-orthosis contact forces is relevant to assess the suitability of an orthotic device for a specific subject, or to redesign the braces for pressure reduction. In this paper, a procedure to estimate such contact forces from simple gait analyses is proposed. It consists of building computational multibody models of subject and devices, and running a forward-dynamics analysis of the orthoses in which the captured motion of the subject is prescribed. At least one force/torque sensor per orthosis is required to calibrate the model. In this case, an extensometry-based load cell was used for such purpose. Results showed that, once calibrated, the model was able to reproduce torque sensor measurements for different motions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Mechanism & Machine Theory is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.mechmachtheory.2020.103800
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      – Code: eng
        Text: English
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      – SubjectFull: Orthopedic apparatus
        Type: general
      – SubjectFull: Torquemeters
        Type: general
      – SubjectFull: Torque measurements
        Type: general
      – SubjectFull: Skin injuries
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      – SubjectFull: Spinal cord
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      – TitleFull: Leg-orthosis contact force estimation from gait analysis.
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              M: 06
              Text: Jun2020
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              Y: 2020
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