Document Detail

Contribution of each leg to the control of unperturbed bipedal stance in lower limb amputees: new insights using entropy.
MedLine Citation:
PMID:  21603630     Owner:  NLM     Status:  MEDLINE    
The present study was designed to assess the relative contribution of each leg to unperturbed bipedal posture in lower limb amputees. To achieve this goal, eight unilateral traumatic trans-femoral amputees (TFA) were asked to stand as still as possible on a plantar pressure data acquisition system with their eyes closed. Four dependent variables were computed to describe the subject's postural behavior: (1) body weight distribution, (2) amplitude, (3) velocity and (4) regularity of centre of foot pressure (CoP) trajectories under the amputated (A) leg and the non-amputated (NA) leg. Results showed a larger body weight distribution applied to the NA leg than to the A leg and a more regular CoP profiles (lower sample entropy values) with greater amplitude and velocity under the NA leg than under the A leg. Taken together, these findings suggest that the NA leg and the A leg do not equally contribute to the control of unperturbed bipedal posture in TFA. The observation that TFA do actively control unperturbed bipedal posture with their NA leg could be viewed as an adaptive process to the loss of the lower leg afferents and efferents because of the unilateral lower-limb amputation. From a methodological point of view, these results demonstrate the suitability of computing bilateral CoP trajectories regularity for the assessment of lateralized postural control under pathological conditions.
Petra Hlavackova; Céline Franco; Bruno Diot; Nicolas Vuillerme
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-05-13
Journal Detail:
Title:  PloS one     Volume:  6     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2011  
Date Detail:
Created Date:  2011-05-23     Completed Date:  2011-10-21     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e19661     Citation Subset:  IM    
FRE 3405, AGIM (AGeing Imaging Modeling), CNRS-UJF-EPHE, Grenoble, France.
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MeSH Terms
Amputees / rehabilitation*
Leg / physiology*
Postural Balance / physiology*
Posture / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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