Dear Simon

How would you define stabilization of a joint? I would say it was the
ability for the joint to remain correctly functional and within its
functional RoM's through out its normal loadings during a certain motion eg
walking. When its not stable it becomes hypermobile (more compliant to load,
respect Prof. K.Kirby.) .
So if there is excessive pronation causing internal rotation of the tiba and
the knee is adducted then there may be loss of core stability ie the Ilio
Tibial band is unable to stabilze the knee and hip joint during the swing
thru phase and some kind of trick movement is required to maintain balance
and hip stability and keep the CoM over the base.
Orthoses may be able to more correctly position the STJ and the knee and in
turn improve core stability, which stabilises the hip.
Does that sound feasible to you Simon?
But would that happen while walking on a soft uneven surfacesuch as snow.
Would the foot orthoses be capable of applying enough force at the foot thru
GRF to change the mechanics of the whole lower limb and pelvis, and would it
need to? Since 'walking' style would be completely changed compared to the
usual gait pattern associated with walking on hard flat ground.
I have looked at some web sites on walking to the north pole and they are
either using some type of walking ski or up to thier knees in snow or
climbing over peaks and crevices. Can this be compared to walking down the
high street and would you expect the same results from your orthoses.


                                    With respect Dave Smith



 ----- Original Message -----
From: "Simon Spooner" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, September 14, 2004 4:11 PM
Subject: Re: walking on side of footpaths


> Maire and all,
>
> Maire wrote:
>
> >>>He has foot related lower back problems too so the orthoses are also
> necessary to stabilise his pelvis.<<<
>
> Can somebody tell me the mechanism by which orthoses "stabilize the
pelvis"?
> Stabilize seems to be such a misused term in podiatry. Perhaps someone
could
> point me in the right direction regarding good quality published research
on
> this one? Kevin, this may or may not link with your theories on abductory
> twist.
>
> Best wishes,
> Simon
>
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