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Comparison of Three Methods Used to Obtain a Neutral Plaster Foot Impression

T McPoil, PhD, PT, ATC, is Assistant Professor, Department of Physical Therapy, Northern Arizona University, NAU Box 15105, Flagstaff, AZ 86011 (USA). At the time this article was written, he was Assistant Professor, Department of Physical Therapy, College of Associated Health Professions, University of Illinois at Chicago, 1919 W Taylor St, 4th Floor, Chicago, IL 60612.
D Schuit, PhD, PT, is Assistant Professor, Department of Physical Therapy, University of Illinois at Chicago.
H Knecht, EdD, PT, is Associate Professor and Head, Department of Physical Therapy, University of Illinois at Chicago.

The purpose of our study was to compare the forefoot-to-hindfoot angles obtained from three methods used to obtain a neutral plaster impression of the foot. The three methods were 1) supine nonweight-bearing (S), 2) prone nonweight-bearing (P), and 3) sitting semiweight-bearing (SW). We obtained foot casts from both feet of 11 female subjects for each of the three methods and used a manual goniometer to measure the forefoot-to-bindfoot angle for each pair of casts. The F ratios were significant for the variables left-right foot (p < .0001) and impression method (p < .001) using a within-subject two-factor analysis of variance. The impression methods S and P were found to be significantly different from SW, but not significantly different from each other, using a Tukey's post hoc comparison. The results indicate that the same forefoot-to-bindfoot alignment can be obtained using either the S or P method but not with the SW method.

Key Words: Foot deformities • Lower extremity, ankle and foot • Orthotics/splints/casts, lower extremity • Tests and measurements, general

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