Ankle joint rotation and exerted moment during plantarflexion dependents on measuring- and fixation method.

We examined the effect of ankle joint fixation vs increased foot pressure (aiming to reduce dynamometer-subject elasticity (DSE)) on the exerted moment during plantarflexion contraction. We also examined the joint rotation in dependence of the measuring site (forefoot, rearfoot) and the foot conditi...

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Autores principales:	Savvas Stafilidis, Carina Kopper-Zisser
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a1c65629043540a7ab56f2fc6d26e996
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spelling	oai:doaj.org-article:a1c65629043540a7ab56f2fc6d26e9962021-12-02T20:17:29ZAnkle joint rotation and exerted moment during plantarflexion dependents on measuring- and fixation method.1932-620310.1371/journal.pone.0253015https://doaj.org/article/a1c65629043540a7ab56f2fc6d26e9962021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0253015https://doaj.org/toc/1932-6203We examined the effect of ankle joint fixation vs increased foot pressure (aiming to reduce dynamometer-subject elasticity (DSE)) on the exerted moment during plantarflexion contraction. We also examined the joint rotation in dependence of the measuring site (forefoot, rearfoot) and the foot condition (fixed, free). We hypothesized higher exerted moments due to reduced DSE compared to fixed condition and an effect of fixation on the joint rotation in dependence of the measuring site. Fourteen healthy individuals (28.7±6.9y) completed in randomized order maximal isometric plantarflexions in four different positions (0-3-6-9 cm) and two ankle joint conditions (fixed-free). Kinematics of the rear- and forefoot were obtained synchronously. We found higher moment in the fixed compared to the free condition at all positions. The maximum moment in the fixed condition did not differ at any position. At the fixed condition, the forefoot rotation did not differ at any position (~5°) while at free condition we observed a significant rotation reduction (form ~12 to ~5°). The rearfoot rotation did not differ between conditions at any position while a significant joint angle reduction was observed (~10 to ~6° and ~12 to ~6°; fixed-free respectively). The results indicate that with appropriate foot fixation the maximum moment can be achieved irrespective of the position. With the foot secured, the measuring site influences the rotational outcome. We suggest that for a minimization of the joint rotation a fixation and the forefoot-measuring site should be preferred. Additionally, for unconstrained foot kinematic observations both measuring sites can be obtained.Savvas StafilidisCarina Kopper-ZisserPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 8, p e0253015 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Savvas Stafilidis Carina Kopper-Zisser Ankle joint rotation and exerted moment during plantarflexion dependents on measuring- and fixation method.
description	We examined the effect of ankle joint fixation vs increased foot pressure (aiming to reduce dynamometer-subject elasticity (DSE)) on the exerted moment during plantarflexion contraction. We also examined the joint rotation in dependence of the measuring site (forefoot, rearfoot) and the foot condition (fixed, free). We hypothesized higher exerted moments due to reduced DSE compared to fixed condition and an effect of fixation on the joint rotation in dependence of the measuring site. Fourteen healthy individuals (28.7±6.9y) completed in randomized order maximal isometric plantarflexions in four different positions (0-3-6-9 cm) and two ankle joint conditions (fixed-free). Kinematics of the rear- and forefoot were obtained synchronously. We found higher moment in the fixed compared to the free condition at all positions. The maximum moment in the fixed condition did not differ at any position. At the fixed condition, the forefoot rotation did not differ at any position (~5°) while at free condition we observed a significant rotation reduction (form ~12 to ~5°). The rearfoot rotation did not differ between conditions at any position while a significant joint angle reduction was observed (~10 to ~6° and ~12 to ~6°; fixed-free respectively). The results indicate that with appropriate foot fixation the maximum moment can be achieved irrespective of the position. With the foot secured, the measuring site influences the rotational outcome. We suggest that for a minimization of the joint rotation a fixation and the forefoot-measuring site should be preferred. Additionally, for unconstrained foot kinematic observations both measuring sites can be obtained.
format	article
author	Savvas Stafilidis Carina Kopper-Zisser
author_facet	Savvas Stafilidis Carina Kopper-Zisser
author_sort	Savvas Stafilidis
title	Ankle joint rotation and exerted moment during plantarflexion dependents on measuring- and fixation method.
title_short	Ankle joint rotation and exerted moment during plantarflexion dependents on measuring- and fixation method.
title_full	Ankle joint rotation and exerted moment during plantarflexion dependents on measuring- and fixation method.
title_fullStr	Ankle joint rotation and exerted moment during plantarflexion dependents on measuring- and fixation method.
title_full_unstemmed	Ankle joint rotation and exerted moment during plantarflexion dependents on measuring- and fixation method.
title_sort	ankle joint rotation and exerted moment during plantarflexion dependents on measuring- and fixation method.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/a1c65629043540a7ab56f2fc6d26e996
work_keys_str_mv	AT savvasstafilidis anklejointrotationandexertedmomentduringplantarflexiondependentsonmeasuringandfixationmethod AT carinakopperzisser anklejointrotationandexertedmomentduringplantarflexiondependentsonmeasuringandfixationmethod
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Ankle joint rotation and exerted moment during plantarflexion dependents on measuring- and fixation method.

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