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I’ve seen it out there and available. Some footbed makers have been for many years adding tremendous inversion to there footbeds, already in the molding and posting process, (lifting the whole medial side).
If you look at the biomechanics, you are essentially inverting the foot and ankle, which initially brings or forces the knee mass lateral or worst, it uses up ankle and foot inversion and blocks eversion range of the subtaler joint (making the peroneals useless. .) It may also cause forefoot problems.
This then causes skiers to use more adductor leverage to bring the knee mass back inside the ski edge. This is possibly a ski technique by itself, but not one I advocate, as it adds stress to the knee and it also causes greater rotational forces to occur from higher in the body. I try to reduce these gross influences, with shaped skis especially. This approach will also have some bearing and may cause difficulty for some widths of skis and the effect on the access to tipping of those skis. I’m talking about ski width. A wide ski already requires more leverage to tip. On hard snow the resistance is strong from such skis. If the foot and ankle are locked up by a device induced inverted position, the ankle has little capability for leveraging the boot, co-contraction (balancing movements and stabilizing the joint) or adding controlled fine tuning balance.
My approach is to make the footbed properly from the start. If more posting is desired or if the foot bed is old, some posting can extend the life of the footbed for a short period. But it depends tremendously on the type of foot. This approach would be very harmful to the cavus foot with little range or flexibility.
With Erik Schlopy for example, we do the exact opposite, we make the medial side of the boot board compressible by 2 mm. This helps him evert his foot, as his feet are very rigid and he has difficulty getting his ankle to move medially toward the side of the boot. (a related topic for further disscussion would be foot and ankle movements for levering the boot and ski, and why is it necessary to access the medial side of the boot with the ankle to control edging and make fine tuning adjustments.)
What I find is more usual out in the ski world, is that the worst of all combinations are being used and applied to feet and ankles that are totally functional and are actually being compromised with footbed devices. Example: A hard or rigid arched footbed with a radically lifted arch applied, made with no regard for the measurements of individuals or consideration of subtler alignment and no forefoot position taken in consideration.
There may be some benefits to strengthening the medial side of the foot by lifting the footbed or boot board. It sure makes a skier feel like there is a strong edge on the ski, but this is often not a high edge angle or strong edging. There is a difference between the performance related outcomes of these definitions.
A locked or restricted foot causes balancing to occur higher in the kinetic chain. I look at these things logically and I try not to overdo any particular point in the system or joint areas.
Remember, we can all sometimes be fooled by what we perceive as a good adjustment, just because it feels different, not because it is actually producing better performance. The body has a great ability to adjust, especially to incorrect alignment, and after awhile it may even begin to feel natural.
I am, just as most skiers are, susceptible to even extreme alignment variations, sometimes I think I’m accessing my edges and angles better, but after I see some video and analyze the situation, I usually go back to the tried and true measurement. Our bodies are very good at fooling us.
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