Date of Award

Summer 2011

Document Type


Degree Name

Master of Science in Education (MSEd)


Human Movement Sciences


Athletic Training

Committee Director

Bonnie Van Lunen

Committee Member

Nelson Cortes

Committee Member

Martha Walker

Call Number for Print

Special Collections LD4331.E44 P58 2011


Context: Functional ankle instability (FAI) is a popular condition in the physically active population. There is a surplus of evidence to demonstrate how FAI decreases proprioception, balance, and overall athletic performance. However, to date there is no evidence that demonstrates how F AI correlates to alterations in plantar pressure distribution differences in a physically active population while completing athletic tasks. Objective: To assess differences in plantar pressure distributions while completing a side cut in individuals with and without FAI. Design: Observational case-control. Setting: Outdoor field turf and research laboratory. Participants: Fifty ankles from physically active individuals (FAI: age= 21.47±3.02 yrs; mass= 67.71±8.95 kg; height=165.87±4.59 cm; Control: age= 21.61±2.36 yrs; mass= 67.47±9.76 kg; height= 169.68±6.38 cm) Main Outcome Measure(s): All participants filled out the Cumberland Ankle Instability Tool (CAIT) to dete1mine the presence of FAI. We assessed foot type using the Foot Posture Index (FPI). The Star Excursion Balance Test was used to assess reach deficits and lower extremity function. Subjects performed a side cut task on FieldTurf. We used a six-part mask to analyze plantar pressure distribution while more specifically examining peak pressure and force-time integral. Results: There was a statistically significant increase in both FTI and peak pressure in the medial forefoot in both groups. There was increased FTI over the lateral forefoot in the FAI group when compared to controls. There was no difference in peak pressure (F(1, 48)= .001,p=0.97), or SEBT reach distances (p >0.05) between the two groups. Conclusions: FAI has no effect on peak pressure values or reach distances of the SEBT. However, when completing a side-step maneuver, individuals with FAI spend more time and force over the lateral forefoot when compared to healthy individuals.


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