Hey Boot Guys,
What are you doing for folks with forefoot varus? Posting under the inside at the fore foot?
finding a true forefoot varus is like finding a 4 leaf clover. they are out there, however they are not as common as the number of footbeds that we see come through our shop from other fitters that have been built based on thinking that they were looking at a forefoot varus. I can tell you that at our shop we remove more forefoot wedging from other footbeds, than footbeds that we add forefoot varus to.
many times the foot presents what appears to be forefoot varus, however when you dig deeper you find that there is enough mobility in the 1st and the 5th MPJ, to allow the 1st to make contact with the earth without wedging into the forefoot. As long as you can get the 1st to drop to the deck with leverage to control the edge, additional wedging could be perceived as overkill.
this is not the case when we are trying to solve problems with forefoot varus or valgus in gait. In that instance you do not have the hard boot shell to control some of the motion that takes place with shoes.
Amongst the boot fitters in this forum you will find as many opinions about how the forefoot presents as there are boot fitters on this forum.
So, this is only my opinion of how to address forefoot varus in ski boots.
100% with Jim, it can often be a result of a poorly made insert made in weight bearing position as the ground reaction forces push up on the 1st ray and elevate it, this then gets translated by the fitter as a forefoot varus and gets posted as such
i guess it depends where you do your biomechanics class and whom the teacher is as to how you assess and what you then see
much more common is that the foot is heavily pronated and has some rigidity in certain parts, this then translates to what looks like it could be a forefoot varus, it is normally these feet who, however narrow always complain that the lateral side of the foot is jamming into the shell... this little scenario is normally associated with another pet subject....lack of dorsiflexion at the ankle joint!..... if the calf is tight it can pull the foot into a pronated position, part of pronation is abduction, if you remove the abduction without addressing the dorsiflexion then you get a FALSE fore foot varus ....
this of course must not be confused with a 4 foot virus , which is something you might find in your kitchen if you don't wash your hands after handling raw chicken
the big question is, as jim said, can you get the heel the 1st MPJ and the 5th MPJ in contact with the ground, if so all is good in the world
and like everything in the world there are some people who just feel better with a little bit of wedging under there... (BUT this is like tequila.. just because some is good does not mean more is better)