Document Detail

Influence of external ankle support on lower extremity joint mechanics during drop landings.
MedLine Citation:
PMID:  20543215     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To investigate the effects of external ankle support (EAS) on lower extremity joint mechanics and vertical ground-reaction forces (VGRF) during drop landings. DESIGN: A 1 x 3 repeated-measures, crossover design. SETTING: Biomechanics research laboratory. PATIENTS: 13 male recreationally active basketball players (age 22.3 +/- 2.2 y, height 177.5 +/- 7.5 cm, mass 72.2 +/- 11.4 kg) free from lower extremity pathology for the 12 mo before the study. INTERVENTIONS: Subjects performed a 1-legged drop landing from a standardized height under 3 different ankle-support conditions. MAIN OUTCOME MEASURES: Hip, knee, and ankle angular displacement along with specific temporal (TGRFz1, TGRFz2; s) and spatial (GRFz1, GRFz2; body-weight units [BW]) characteristics of the VGRF vector were measured during a drop landing. RESULTS: The tape condition (1.08 +/- 0.09 BW) demonstrated less GRFz1 than the control (1.28 +/- 0.16 BW) and semirigid conditions (1.28 +/- 0.21 BW; P < .0001), and GRFz2 was unaffected. For TGRFz1, no-support displayed slower time (0.017 +/- 0.004 s) than the semirigid (0.014 +/- 0.001 s) and tape conditions (0.014 +/- 0.002 s; P < .05). For TGRFz2, no-support displayed slower time (0.054 +/- 0.006 s) than the semirigid (0.050 +/- 0.006 s) and tape conditions (0.045 +/- 0.004 s; P < .05). Semirigid bracing was slower than the tape condition, as well (P < .05). Ankle-joint displacement was less in the tape (34.6 degrees +/- 7.7 degrees) and semirigid (36.8 degrees +/- 9.3 degrees) conditions than in no-support (45.7 degrees +/- 7.3 degrees; P < .05). Knee-joint displacement was larger in the no-support (45.1 degrees +/- 9.0 degrees) than in the semirigid (42.6 degrees +/- 6.8 degrees; P < .05) condition. Tape support (43.8 degrees +/- 8.7 degrees) did not differ from the semirigid condition (P > .05). Hip angular displacement was not affected by EAS (F(2,24) = 1.47, P = .25). CONCLUSIONS: EAS reduces ankle- and knee-joint displacement, which appear to influence the spatial and temporal characteristics of GRFz1 during drop landings.
Mitchell L Cordova; Yosuke Takahashi; Gregory M Kress; Jody B Brucker; Alfred E Finch
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of sport rehabilitation     Volume:  19     ISSN:  1056-6716     ISO Abbreviation:  J Sport Rehabil     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-06-14     Completed Date:  2010-08-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9206500     Medline TA:  J Sport Rehabil     Country:  United States    
Other Details:
Languages:  eng     Pagination:  136-48     Citation Subset:  IM    
Biodynamics Research Laboratory, Department of Kinesiology, and Center for Biomedical Engineering Systems, University of North Carolina, Charlotte, NC, USA.
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MeSH Terms
Analysis of Variance
Ankle Injuries / etiology,  prevention & control
Ankle Joint / physiology*
Athletic Tape*
Basketball / injuries,  physiology*
Confidence Intervals
Cross-Over Studies
Hip Joint / physiology*
Knee Joint / physiology*
Lower Extremity / physiology
Muscle Contraction / physiology
Muscle, Skeletal / physiology
Range of Motion, Articular
Risk Factors
Young Adult

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

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