Skip to main content
main-content
Top

Tip

Swipe om te navigeren naar een ander artikel

01-12-2012 | Oral presentation | bijlage 1/2012 Open Access

Journal of Foot and Ankle Research 1/2012

Effects of extrinsic rearfoot posting in custom foot orthoses on frontal plane kinematics and kinetics

Tijdschrift:
Journal of Foot and Ankle Research > bijlage 1/2012
Auteurs:
Scott Telfer, Mandy Abbot, Daniel Rafferty, Jim Woodburn

Background

A regularly prescribed design variable in foot orthoses (FOs) is the addition of an extrinsic rearfoot post, a feature which can be angled medially or laterally and is intended to control movement of the calcaneus during the stance phase of gait [ 1]. This study aims to investigate whether introducing incremental changes in this feature will produce a linear trend in the user’s frontal plane biomechanical responses, and whether responses vary between normal and pronated feet.

Materials and methods

Ten participants were recruited: five healthy controls and five patients with a symptomatic pronated foot type. Computer aided design (CAD) models of a pair of customised FOs were produced from a 3D surface scan of the subject’s feet using orthotic design software. These devices were manufactured and checked for comfort and fit. The original CAD design was subsequently altered to produce nine additional FO designs (for one randomly chosen foot) with posting levels varying in 2° steps from 6° lateral to 10° medial and these were then manufactured. After wearing the original FOs for one week, participants came to the gait laboratory for assessment and kinematic and kinetic measurements of the lower limbs were made during gait for each orthotic condition.

Results

Linear trends for the reduction of peak rearfoot eversion were measured (control group R 2=0.9, P=0.003; patient group R 2=0.86, P=0.04) across the tested orthotic conditions (Figure 1). Differences in the effects of the devices on peak rearfoot eversion in the control and patient group were found to be significant (P<0.001). Changes in ankle and knee adduction moments were not significant for trends or between groups.

Conclusions

These results provide preliminary quantitative mode of action evidence for the prescription of personalised FOs intended to control rearfoot eversion through the use of an extrinsic rearfoot post. Care should be taken when extrapolating results from FO research carried out on normal foot types to clinical populations.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://​creativecommons.​org/​licenses/​by/​2.​0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Onze productaanbevelingen

BSL Podotherapeut Totaal

Binnen de bundel kunt u gebruik maken van boeken, tijdschriften, e-learnings, web-tv's en uitlegvideo's. BSL Podotherapeut Totaal is overal toegankelijk; via uw PC, tablet of smartphone.

Literatuur
Over dit artikel

Andere artikelen bijlage 1/2012

Journal of Foot and Ankle Research 1/2012 Naar de uitgave