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PFOLA
Prescription Foot Orthotic Laboratory Association
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PFOLA Message Board
- Welcome to PFOLA's message board. Please feel free to discuss issues related to orthotics, pedorthics, and biomechanics with your professional colleagues.
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Subject Re: Effects of Orthotic Shell Rigidity
Date Wed Aug 1 2001 23:53
Author Phillip Hartshorne (virtualorthotics@bigpond.com)
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Dear Chris, I have been thinking about this concept for a couple of years now. I have a CAD-CAM facility based in Sydney, Australia and we have been experimenting recently with a number of shell additions. The options that we have been playing around with have been placing bars in the ILA, tapering the shell thickness from thicker at the heel to thinner at the distal edge, changes in shell thickness in different areas and so forth. The questions that arise when you add something like a bar that runs parallel, close to the medial border of the orthosis to increase rigidity: 1. Where should you position the bar? 2. Dimensions of the bar? 3. What is the bar actually doing in terms of increasing rigidity? There are a number of other questions that I can bring up, but my last point brings me to your discussion. If we don't have an accurate reference, then how can we really compare what a particular addition (or indeed an increase in heel cup height etc.) is effecting the overall physics of the given situation. I haven't looked around recently for literature on this subject, but found little a couple of years ago. The only figures I do have are from the plastics manufacture saying what a flat bit of plastic will do (and I don't even have that with me at the moment). Sorry for throwing more questions back to you than providing answers. Cheers Phil Virtual Orthotics PO Box 6032 Silverwater NSW 1811 Australia 61 2 9749 1038 |
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