Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
A method to estimate in vivo mechanical properties of human tendon in the lower leg using ultrasound imaging combined with motion capture
KTH, School of Technology and Health (STH).
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Ett tillvägagångssätt som kombinerar ultraljud med rörelseinspelning för att estimera mekaniska egenskaper in vivo hos mänsklig sena i underbenet (Swedish)
Abstract [en]

Musculoskeletal models and simulations allow for the estimation of forces acting on muscles and joints during human movement and athletic performance. In order to improve the accuracy of these models for a specific application, knowledge about subject-specific in vivo properties of human muscle and tendon is needed. This study presents a method for estimating in vivo mechanical properties of human tendon in the lower leg, using a combination of ultrasound imaging and motion capture. Key mechanical parameters — such as tendon stiffness, moment arm, slack length and force-strain relationship — and the contribution of tendon elongation to ankle mobility of the medial gastrocnemius (MG) and soleus (SOL) aspects of the Achilles tendon were obtained in vivo in 8 typically-developed adults, and the applicability of the method on the tibialis anterior (TA) tendon was investigated. In contrast to previous studies using a comparable method, variable tendon moment arm lengths during passive movement of the ankle joint was taken into consideration. As a novelty, the passive mechanical properties of the Achilles tendon were obtained in vivo in 4 hemiplegic post-stroke subjects and compared to the 8 typically-developed subjects. The estimated mechanical parameters of the MG and SOL aspects of the Achilles tendon were consistent with findings in the literature. In order to estimate stiffness of the TA tendon, it was shown that a larger range of motion (ROM) of the foot during the passive rotation experiments is needed. The comparison between typically-developed and hemiplegic post-stroke subjects revealed significantly lower tendon stiffness and slack angle, and significantly higher contribution of tendon elongation to ankle mobility in the post-stroke group. The developed method enables estimation of in vivo mechanical properties of tendon in the lower leg and contributes to improving the accuracy of subject-specific musculoskeletal models and simulations.

Place, publisher, year, edition, pages
2017. , p. 32
Series
TRITA-STH ; 2017:69
Keywords [en]
medical engineering biomechanics ultrasound imaging motion capture tendon in vivo
National Category
Medical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-211118OAI: oai:DiVA.org:kth-211118DiVA, id: diva2:1127631
External cooperation
Swedish School of Sport and Health Sciences (GIH)
Subject / course
Medical Engineering
Educational program
Master of Science - Medical Engineering
Presentation
2017-06-08, T55, Hälsovägen 11c, Huddinge, 08:00 (English)
Supervisors
Examiners
Projects
Person-specific biomechanical modelsAvailable from: 2017-08-06 Created: 2017-07-18 Last updated: 2017-08-06Bibliographically approved

Open Access in DiVA

Marius_Schlippe_Thesis(6450 kB)67 downloads
File information
File name FULLTEXT01.pdfFile size 6450 kBChecksum SHA-512
5da26f19e7d71afec4ded889e12f16646e8e97fe6412c0f5ae2970520167bb5d8c53d94960df58f201d4b636659b8e45d37648201c6ddea2dc97eb3ea23ab64f
Type fulltextMimetype application/pdf

By organisation
School of Technology and Health (STH)
Medical Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 67 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 343 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf