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Effects of Foot Orthoses on Center-of-Pressure Patterns in Women

T McPoil, PhD, PT, ATC, is Assistant Professor, Department of Physical Therapy, Northern Arizona University, NAU Box 15105, Flagstaff, AZ 86011 (USA). He was Assistant Professor, Department of Physical Therapy, College of Associated Health Professions, University of Illinois at Chicago, Chicago, IL, when this study was conducted.
M Adrian, PED, is Director of Biomechanics Research Laboratory and Professor of Physical Education, University of Illinois at Urbana-Champaign, Urbana, IL 61801.
P Pidcoe, BS, is Research Associate, Department of Physical Therapy, College of Associated Health Professions, University of Illinois at Chicago, 1919 W Taylor St, Chicago, IL 61612.

The purpose of this study was to determine the effects of foot orthoses on the pattern of center of pressure in women with forefoot deformities during walking. Nine subjects with a forefoot varus and nine subjects with a forefoot valgus walked across a force platform three times for each of the following five treatment conditions: 1) barefoot, 2) shoes only, 3) rigid orthoses with shoes, 4) semi-rigid orthoses with shoes, and 5) soft orthoses with shoes. Force data were analyzed to determine the area under the center-of-pressure curve. A significant omnibus F ratio was obtained for treatments (p < .001) and the deformity X treatments interaction (p < .05) using a two-factor, mixed analysis of variance for repeated measures. Tukey's post hoc comparisons for the Varus Group resulted in significant differences (p < .05) between the following treatment conditions: 1) barefoot and shoes only, 2) barefoot and rigid orthoses with shoes, 3) barefoot and semi-rigid orthoses with shoes, and 4) barefoot and soft orthoses with shoes. Tukey's post hoc comparisons for the Valgus Group resulted in significant differences (p < .05) between the following treatment conditions: 1) barefoot and rigid orthoses with shoes, 2) barefoot and semi-rigid orthoses with shoes, and 3) barefoot and soft orthoses with shoes. The shoes-only treatment condition, in comparison with the barefoot condition, significantly reduced the center-of-pressure area for the Varus Group only. All three types of foot orthoses with shoes, when compared with the barefoot condition, significantly reduced the pattern of the center of pressure for the Valgus Group. No differences among materials used for orthosis fabrication were evident.

Key Words: Foot • Forefoot, human • Lower extremity, ankle and foot • Orthotics/splints/casts, lower extremity

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				D. H. Richie Jr. Effects of Foot Orthoses on Patients with Chronic Ankle Instability J Am Podiatr Med Assoc, January 1, 2007; 97(1): 19 - 30. [Abstract] [Full Text] [PDF]

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