| An instrumented tissue tester for measuring soft tissue property under the metatarsal heads in relation to metatarsophalangeal joint angle. | |
| | |
MedLine Citation:
|
PMID: 21513940 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
Identification of the localized mechanical response of the plantar soft tissue pads underneath the metatarsal heads (i.e., sub-MTH pad) to external loading is key to understand and predict how it functions in a gait cycle. The mechanical response depends on various parameters, such as the external load (direction and rate), the sub-MTH tissue properties (anisotropy and viscoelasticity), and the configuration of the metatarsophalangeal (MTP) joint overlying the tissue. In this study, an instrument-driven tissue tester that incorporates a portable motorized indentor within a special foot positioning apparatus was developed for realistic in vivo mechanical characterization (i.e. tissue stiffness and force relaxation behavior) of the local sub-MTH pad with the MTP joint configured at various dorsiflexion angles associated with gait. The tester yields consistent results for tests on the 2nd sub-MTH pad. Measurement errors for the initial stiffness (for indentation depths ≤1mm), end-point stiffness, and percentage force relaxation were less than 0.084N/mm, 0.133N/mm, and 0.127%, respectively, across all test configurations. The end-point tissue stiffness, which increased by 104.2% due to a 50° MTP joint dorsiflexion, also agreed with a previous investigation. In vivo tissue's force relaxation was shown to be pronounced (avg.=8.1%), even for a short holding-time interval. The proposed technique to facilitate study of the dependence of the local sub-MTH pad and tissue response on the MTP joint angle might be preferable to methods that focus solely on measurement of tissue property because under physiologic conditions the sub-MTH pad elasticity may vary in gait, to adapt to drastically changing mechanical demands in the sub-MTH region of the terminal stance-phase, where MTP joint dorsiflexion occurs. |
| | |
Authors:
|
Wen-Ming Chen; Victor Phyau-Wui Shim; Seung-Bum Park; Taeyong Lee |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2011-4-20 |
Journal Detail:
|
Title: Journal of biomechanics Volume: - ISSN: 1873-2380 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
|
Created Date: 2011-4-25 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 0157375 Medline TA: J Biomech Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
|
Copyright © 2011 Elsevier Ltd. All rights reserved. |
Affiliation:
|
Division of Bioengineering, National University of Singapore, Block E3A #07-15, 7 Engineering Drive 1, Singapore 117574, Singapore. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Circulating vaspin levels and epicardial adipose tissue thickness are associated with impaired coron...
Next Document: Innovative synthesis of citrate-coated superparamagnetic Fe(3)O(4) nanoparticles and its preliminary...