Document Detail

Effects of circumferential ankle pressure on ankle proprioception, stiffness, and postural stability: a preliminary investigation.
MedLine Citation:
PMID:  15373008     Owner:  NLM     Status:  MEDLINE    
STUDY DESIGN: Cross-sectional repeated-measures design. OBJECTIVE: Determine the effects of circumferential ankle pressure (CAP) intervention on proprioceptive acuity, ankle stiffness, and postural stability. BACKGROUND: The application of CAP using braces, taping, and adaptive shoes or military boots is widely used to address chronic ankle instability (CAI). An underlying assumption is that the CAP intervention might improve ankle stability through increased proprioceptive acuity and stiffness in the ankle. METHOD AND MEASURES: A convenience sample of 10 subjects was recruited from the local university community and categorized according to proprioceptive acuity (high, low) and ankle stability (normal, CAI). Proprioceptive acuity was measured when blindfolded subjects were asked to accurately reproduce a self-selected target ankle position before and after the application of CAP. Proprioceptive acuity was determined in 5 different ankle joint position sense tests: neutral, inversion, eversion, plantar flexion, and dorsiflexion. Joint position angles were recorded electromechanically using a potentiometer. Passive ankle stiffness was computed from the ratio of applied static moment versus angular displacement. Active ankle stiffness was determined from biomechanical analyses of ankle motion following a mediolateral perturbation. Postural stability was quantified from the center of pressure displacement in the mediolateral and the anteroposterior directions in unipedal stance. All measurements were recorded with and without CAP applied by a pediatric blood pressure cuff. Data were analyzed using a separate mixed-model analysis of variance (ANOVA) for each dependent variable. Post hoc comparison using Tukey's honestly significant difference (HSD) test was performed if significant interactions were obtained. Significance level was set at P<.05 for all analyses. RESULTS: Significant group (high versus low proprioceptive acuity) x CAP interactions were identified for postural stability. Passive ankle stiffness was not increased by an application of CAP. Active ankle stiffness was significantly different between the high and low proprioceptive acuity groups and was not affected by an application of CAP. Significant group (normal versus CAI) x CAP interactions were observed for mediolateral center-of-pressure displacement with a main effect of group on neutral joint position sense. CONCLUSIONS: Application of CAP increased proprioceptive acuity and demonstrated trends toward increased active stiffness in the ankle, hence improved postural stability. The effects tend to be limited to individuals with low proprioceptive acuity.
Sung H You; Kevin P Granata; Linda K Bunker
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Controlled Clinical Trial; Journal Article    
Journal Detail:
Title:  The Journal of orthopaedic and sports physical therapy     Volume:  34     ISSN:  0190-6011     ISO Abbreviation:  J Orthop Sports Phys Ther     Publication Date:  2004 Aug 
Date Detail:
Created Date:  2004-09-17     Completed Date:  2004-12-16     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7908150     Medline TA:  J Orthop Sports Phys Ther     Country:  United States    
Other Details:
Languages:  eng     Pagination:  449-60     Citation Subset:  IM    
Hampton University Physical Therapy Department, Hampton, VA, USA.
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MeSH Terms
Ankle / physiology*,  physiopathology*
Joint Instability / physiopathology*,  rehabilitation*
Physical Therapy Modalities
Postural Balance / physiology
Proprioception / physiology
Range of Motion, Articular / physiology

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

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