Several decisions need to be made when prescribing foot orthoses for abnormal foot pronation. One of these decisions is how much force is needed from orthoses to supinate the foot. The supination resistance test has been described as one technique to help determine the amount of force needed. The aim of this project was to determine the reliability of the manual supination resistance test. Four clinicians of differing levels of experience performed the test on 44 subjects (88 feet) on 2 separate days. The test had good reliability overall, with an intertester intraclass correlation coefficient of 0.89. For the two more experienced clinicians, the intratester intraclass correlation coefficients were good (0.82 and 0.78), but for the two inexperienced clinicians they were poor (0.56 and 0.62). The supination resistance test may be clinically useful in the prescription of foot orthoses, but more work is needed to determine its validity and its relationship to clinical outcomes.
Many different types of foot orthoses are used to treat biomechanical dysfunction of the foot. Little evidence is available to guide clinicians in the selection of foot orthoses. The aim of this project was to determine whether resistance of the foot to supination or the Foot Posture Index could predict the static stance response to different types of prefabricated foot orthoses. The Foot Posture Index score was determined and resistance to supination was measured in 18 subjects (36 feet). Changes in the frontal plane calcaneal angle and navicular height were then measured as the subjects stood on six different types of foot orthoses. All orthoses resulted in an increase in navicular height, but only three orthoses changed the calcaneal angle in the frontal plane. Resistance to supination did not predict the response to the different types of orthoses, but the Foot Posture Index score was associated with changes from using some of the orthoses.
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