An Evaluation of the Correlation between the Free Moments Applied on the Lower Extremity and the Knee Extensor Mechanism Force in Pronated Foot Subjects during the Stance Phase of Gait
Background: Due to the rotatory nature of the excessive subtalar pronation and the possible impairment of the tibial rotation-knee flexion mechanism, changes of the free moment (FM) and changes of the extensor mechanism force are expected in hyper-pronated foot subjects. The purpose of this study...
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Shiraz University of Medical Sciences
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doaj-d3b04640321343969bc94cd8d20d192a2020-11-25T02:12:32ZengShiraz University of Medical SciencesJournal of Rehabilitation Sciences and Research 2345-61592345-61592016-12-01348590An Evaluation of the Correlation between the Free Moments Applied on the Lower Extremity and the Knee Extensor Mechanism Force in Pronated Foot Subjects during the Stance Phase of GaitFarzaneh Yazdani0Mohsen Razeghi1 Samaneh Ebrahimi2Student research committee, Department of Physical Therapy, School of Rehabilitation Sciences, Shiraz University of Medical Sciences, Shiraz, IranDepartment of Physical Therapy, School of Rehabilitation Sciences, Shiraz University of Medical Sciences, Shiraz, IranStudent research committee, Department of Physical Therapy, School of Rehabilitation Sciences, Shiraz University of Medical Sciences, Shiraz, IranBackground: Due to the rotatory nature of the excessive subtalar pronation and the possible impairment of the tibial rotation-knee flexion mechanism, changes of the free moment (FM) and changes of the extensor mechanism force are expected in hyper-pronated foot subjects. The purpose of this study was to evaluate the correlation between the FM applied on the lower extremity and the knee extensor mechanism force in subjects with flexible pronated feet. Methods: Fifteen asymptomatic female subjects (21.32±1.66 y, 56.30±6.08 kg, 159±6.3 cm) participated in the study. Excessive subtalar pronation was determined by measuring the resting calcaneal stance position (RCSP) in the frontal plane during weight bearing. A neutrally aligned foot was defined as having an RCSP between 2° of inversion and 2° of eversion. On the other hand, a flat foot had an RCSP of more than or equal to 4° of eversion. Both kinetic and kinematic data were collected using a six-camera motion analysis system and a single force plate. Three successful barefoot walking trials were recorded at selfselected speeds. The extensor mechanism force and the adductory component of the free moment (ADD FM) were calculated. The correlation between the ADD FM and the knee extensor mechanism force was examined using the Pearson correlation test. Results: The Pearson correlation analysis showed a high positive correlation between the ADD FM and the extensor mechanism force (r=0.917, P<0.001). Conclusion: Excessive subtalar pronation, along with a possible impairment of the tibial rotation-knee flexion mechanism, may affect the extensor mechanism force at the knee joint. From a clinical perspective, the possible biomechanical linkage between the knee and the foot complex in the physical examination and treatment of patients should be considered.http://jrsr.sums.ac.ir/index.php/jrsr/article/view/152/100Subtalar jointPronationFree momentExtensor mechanism force |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Farzaneh Yazdani Mohsen Razeghi Samaneh Ebrahimi |
spellingShingle |
Farzaneh Yazdani Mohsen Razeghi Samaneh Ebrahimi An Evaluation of the Correlation between the Free Moments Applied on the Lower Extremity and the Knee Extensor Mechanism Force in Pronated Foot Subjects during the Stance Phase of Gait Journal of Rehabilitation Sciences and Research Subtalar joint Pronation Free moment Extensor mechanism force |
author_facet |
Farzaneh Yazdani Mohsen Razeghi Samaneh Ebrahimi |
author_sort |
Farzaneh Yazdani |
title |
An Evaluation of the Correlation between the Free Moments Applied on the Lower Extremity and the Knee Extensor Mechanism Force in Pronated Foot Subjects during the Stance Phase of Gait |
title_short |
An Evaluation of the Correlation between the Free Moments Applied on the Lower Extremity and the Knee Extensor Mechanism Force in Pronated Foot Subjects during the Stance Phase of Gait |
title_full |
An Evaluation of the Correlation between the Free Moments Applied on the Lower Extremity and the Knee Extensor Mechanism Force in Pronated Foot Subjects during the Stance Phase of Gait |
title_fullStr |
An Evaluation of the Correlation between the Free Moments Applied on the Lower Extremity and the Knee Extensor Mechanism Force in Pronated Foot Subjects during the Stance Phase of Gait |
title_full_unstemmed |
An Evaluation of the Correlation between the Free Moments Applied on the Lower Extremity and the Knee Extensor Mechanism Force in Pronated Foot Subjects during the Stance Phase of Gait |
title_sort |
evaluation of the correlation between the free moments applied on the lower extremity and the knee extensor mechanism force in pronated foot subjects during the stance phase of gait |
publisher |
Shiraz University of Medical Sciences |
series |
Journal of Rehabilitation Sciences and Research |
issn |
2345-6159 2345-6159 |
publishDate |
2016-12-01 |
description |
Background: Due to the rotatory nature of the excessive subtalar pronation
and the possible impairment of the tibial rotation-knee flexion mechanism,
changes of the free moment (FM) and changes of the extensor mechanism force
are expected in hyper-pronated foot subjects. The purpose of this study was to
evaluate the correlation between the FM applied on the lower extremity and the
knee extensor mechanism force in subjects with flexible pronated feet.
Methods: Fifteen asymptomatic female subjects (21.32±1.66 y, 56.30±6.08
kg, 159±6.3 cm) participated in the study. Excessive subtalar pronation was
determined by measuring the resting calcaneal stance position (RCSP) in the
frontal plane during weight bearing. A neutrally aligned foot was defined as
having an RCSP between 2° of inversion and 2° of eversion. On the other hand,
a flat foot had an RCSP of more than or equal to 4°
of eversion. Both kinetic and
kinematic data were collected using a six-camera motion analysis system and a
single force plate. Three successful barefoot walking trials were recorded at selfselected
speeds. The extensor mechanism force and the adductory component of
the free moment (ADD FM) were calculated. The correlation between the ADD
FM and the knee extensor mechanism force was examined using the Pearson
correlation test.
Results: The Pearson correlation analysis showed a high positive correlation
between the ADD FM and the extensor mechanism force (r=0.917, P<0.001).
Conclusion: Excessive subtalar pronation, along with a possible impairment of
the tibial rotation-knee flexion mechanism, may affect the extensor mechanism
force at the knee joint.
From a clinical perspective, the possible biomechanical linkage between the
knee and the foot complex in the physical examination and treatment of patients
should be considered. |
topic |
Subtalar joint Pronation Free moment Extensor mechanism force |
url |
http://jrsr.sums.ac.ir/index.php/jrsr/article/view/152/100 |
work_keys_str_mv |
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