Design and development of high profile foot orthosis to control foot pronation in children with flexible flat feet

Name: Thana Charoenvitvorakul

LCSH: Foot

LCSH: Orthopedic apparatus

Abstract: The objective of this study was to evaluate stiffness of chosen materials for High Profile Foot Orthosis(HPFO)'s border by evaluating deformation properties of this device configuration while loaded in a compression testing apparatus. The HPFO's border that was used was made with Podiaflex® 1.2 mm thickness attached together with Flexan® series1 0.53mm thickness. To test stiffness of device border, a pneumatic cylinder was connected to an air pressure regulator and air pump to perform pushing force to a paddle at the end of cylinder. To compare deformation volume at each corresponding force applied to the model shoe with HPFO as well as deformation with the model shoe without the HPFO. The HPFO's border on model shoe could create a counter force and hold original form well at 7.85N with a deforming volume at just 8 mm. Compared with a model shoe without HPFO, a deformation of around 25 mm occurred with the same paddle force applied. At 15.7N of force the model with HPFO could tolerate force and deformed at 14 mm, whereas in the model without HPFO there was a deformation of 33 mm. At 23.55N, 31.40N of force a similar HPFO deformation trend was observed, 18mm and 21mm respectively. A deforming volume ratio of model shoe without HPFO from 23.55N to 31.40N of force are higher than model shoe with HPFO by 2 times (44.8 mm, 58.6 mm) and the model shoe beginning to deform at this level. The results it is clear that a reduction deformation volume at medial side of shoe occurred in the HPFO when force was applied. This could be as a result of the materials' hardness and extra layers at the border areas reinforcing the heel part of model shoe to be stronger. The border of HPFO was designed to provide the same support to control over pronation of foot in flexible flatfeet. The chosen materials were tested and result of this study is an evidence of an acceptable performance of the HPFO's border, with an ability of the combo to tolerate various loading forces.

Mahidol University. Mahidol University Library and Knowledge Center

Address: NAKHONPATHOM

Email: liwww@mahidol.ac.th

Name: Gulapar Srisawasdi

Role: Thesis Advisors

Name: Navaporn Chadchavalpanichaya

Role: Thesis Advisors

Created: 2019

Modified: 2024-02-02

Issued: 2024-02-02

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Prosthetics, Orthotics and Pedorthics

Grantor: Mahidol University

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