Abstract
A study to compare two densities of plastazote used in the fabrication of insoles was undertaken. Parameters of durability, comfort and support were considered in 14 normal subjects.
Statistical analysis demonstrated no significance between the mean difference in the initial and end thickness of the two materials, and the rate of thinning of the two materials. There was no correlation between body weight and the rate of thinning or the final thickness. After 12 weeks the mean thickness of the medium density plastazote was 1.59 mm. whereas in the low density the plastazote was .81 mm. Subjective parameters were measured by a questionnaire. The medium density was felt to offer support with questionable comfort. The low density provided comfort and support.
In the clinical application it was suggested that for patients with sensitive areas on the plantar surface of the foot the comfortable low density material would be most appropriate. For patients with foot pain due mainly to arch strain the supportive more durable medium density would be best. A combination of the two materials has been suggested to provide comfort with increased durability.
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