The short term effect of pre-fabricated foot orthoses on arch height and plantar load bearing pattern

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The short term effect of pre-fabricated foot orthoses on arch height and plantar load bearing pattern


Author: Yu, Man-kit.
Title: The short term effect of pre-fabricated foot orthoses on arch height and plantar load bearing pattern
Degree: M.Sc.
Year: 2005
Subject: Hong Kong Polytechnic University -- Dissertations
Foot -- Abnormalities -- Treatment
Orthopedic shoes
Department: Jockey Club Rehabilitation Engineering Centre
Pages: vi, 69 leaves : ill. ; 30 cm.
InnoPac Record:
Abstract: The medial longitudinal arch (MLA), which is formed by a series of bones and ligaments is one of the important foot structures. According to the measurement of arch height, there are three basic foot-types. Different parameters, such as the Arch Index (AI), were used to document foot-types in the static condition. The MLA is flattened under loading. During the dynamic condition, it is controlled by the extrinsic muscles. Over-loading of the extrinsic muscles will cause overuse syndromes. Foot orthoses can be used to support the MLA and prevent excessive subtalar pronation to help the overuse syndromes. The well acceptance of the foot orthoses also leads people to consider using foot orthoses for prevention of lower limb problems. However, the effect of foot orthoses on the load bearing capability of the foot arch has not been clearly stated. A study is necessary. In this study, 20 subjects with normal foot structure were recruited and provided with pre-fabricated foot orthoses. They were asked to use the foot orthoses for five weeks. The F-scan system was used to capture the pressure data with his/her self-selected comfortable walking speed. Three measurements were performed on the 1st week, 3rd week and 5th week respectively. Mid-foot load ratio under the Orthotic and Shod Conditions (OLR and SLR respectively), and In-shoe Contact Ratio (ICR) were calculated for comparison. The results showed that there was significant difference between the OLR and SLR. The mid-foot load was increased by 6% with the use of foot orthoses. The pre-fabricated foot orthoses provided more support to the MLA after one week of adaptation period. The mid-foot load ratios did not change significantly after 5 weeks. There was no time effect.

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