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Placement of leg, knee and ankle when casting footbeds

post #1 of 6
Thread Starter 

Hi guys,  I just had a pair of sidas foot beds modeled on my feet and I was concerned the tech did not line up my knee with my ankle which I thought was absolutely necessary to do so when casting?  Yes or no?  I also had these cast while I stood straight up with all my weight on them.  Are these ok or not?  

post #2 of 6

We would cast you, seated with your thigh parallel to the floor, your lower leg vertical when viewed from the side and knee centered over the foot, when viewed from the front and then with the ankle joint in sub talor neutral.  None of which I saw you mention in your OP.


foot beds done on a foam pillow, often show up with a lot of (false) fore foot varus posting under the first met---a flat arch and poorly shaped heel cup and seldom are set at sub talor neutral (hard to find and hold that position when standing).



post #3 of 6

there are many different methods for casting direct mold footbeds.


each manufacturer has their own protocol for casting their devices.


in the case of comformable/sidas they are typically cast on their vacuum casting tray in a fully weighted position. the common protocol that they teach is to "fire" the windlass action by raising the toes to get the arch to maximum supportable size, as well as to get the heel bone and the heel cord in alignment ( perpendicular to the earth ) with the center of knee mass falling somewhere close to over the second toe.


should your guy have addressed the Sidas protocol? not my place to say. inherently no footbed system is good or bad. a master of any of the different products out there is a master because they understand the medium and the tools that they work with. boot fitters love to bag on any footbeds that they have not made. and ultimately comfort and performance are in the eye of the end user.



post #4 of 6
Thread Starter 

Thanks guys. Yes these were conforms.  I was instructed to stand straight up  with no support.  I was wobbling back and forth and he pushed my heels down hard and to the out side while lifting my big toe but he never aligned my knees. There was a big gap under my arches and he pushed stuff into the void to fill.  My toes of course were way up high and it felt like I was in a pair of earth shoes, remember those negative heel shoes?  When I stepped out he manually pulled all the material that was under my toes flat down. I haven't skied in them yet and only felt them in my boots for under 5 minutes.  I was concerned I was centered or balanced.  The last good pair I had made was 15 years ago and I distinctly remember the guy lining up my knee and ankle and the result was that pair was great. 

post #5 of 6

everything the guys have said is as it should be, best thing is probably to go back and discuss it with your fitter, especially as you are concerned about how they feel, he /she should be able to explain why they have done what they have done..



so long as they do not give the answer i once heard at a training session....



we were very lucky to have a top DPM come in and run a section of a training day i was running with Superfeet for retail staff many years ago, before he started his presentation he asked a couple of the attendees "why are you here?"  the first guy says he enjoys his job and wants to learn how to do it better, another says similar, then he gets to a guy towards the back who obviously wasn't listening to the responses, he asks the same question, the response will stay with me for ever.... "because my manager told me i have to be here!" 

post #6 of 6
Thread Starter 

Thanks again. 

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