Hi Bruce,
the material of choice is an EVA perhaps of medium density depending on the
weight of the patient.
By lifting the small area under the navicular the front edge of the arch is
brought
towards the heel posteriorly taking the high point of the posting in the
arch away from the foot, hopfully eliminatng the contact/friction which has
caused the blistering.
I'm not sure if increasing the calc pitch is the same but I feel it should
have a similar effect, haven't tried it, might do.
kind regards
steve
> -----Original Message-----
> From: A group for the academic discussion of current issues in podiatry
> [mailto:[log in to unmask]]On Behalf Of Bruce Williams
> Sent: 19 April 2004 14:24
> To: [log in to unmask]
> Subject: Re: MLA blisters in runners
>
>
> Steve;
> Interesting response. Could you explain the raise under the navicular
> more clearly? What material do you use? How high, and wide is the raise?
> How thick?
> Also, would this be akin to increasing the calcaneal pitch angle?
> Sincerely;
> Bruce Williams
>
> ----- Original Message -----
> From: "Steve Avil" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, April 19, 2004 6:00 AM
> Subject: Re: MLA blisters in runners
>
>
> > Hello Jacqui and all,
> >
> > sorry to come to this late I have been away.
> > I have read the entries re blistering. I do find this but it
> doesn't cause
> > too many problems. It occurs usually in those orhtoses which
> tend to have
> > higher density materials in the arch.
> > I have found that using semi rigid orthoses can cause blistering of the
> long
> > arch particularly behind the 1st Mpjt. I usually reduce the
> orthoses , by
> > millimetres,
> > at the point of blistering, from the underside of the orthoses, which
> tends
> > to sort out the problem.
> > I have pondered that the long arch must elongate on the orthoses, which
> > doesn't match it, as the heel lifts. With the elongation of the
> > arch(dorsiflexion of the first met) there is friction between the pt and
> the
> > orthoses.
> > I have tried changing covering materials which has helped sometines made
> it
> > worse.
> > A small raise under th navicular can also help, which I believe
> stops the
> > elongation. I believe it allows the first met to adopt a more
> plantarflexed
> > position and miss the need to elongate at the propulsive phase.
> > Hope these thoughts are of use.
> > So far they have worked in my practice.
> >
> > kind regards
> >
> > steve avil
> > Northampton School of Podiatry
> >
> >
> >
> > > -----Original Message-----
> > > From: A group for the academic discussion of current issues
> in podiatry
> > > [mailto:[log in to unmask]]On Behalf Of Jacqui Baggaley
> > > Sent: 14 April 2004 13:18
> > > To: [log in to unmask]
> > > Subject: Re: MLA blisters in runners
> > >
> > >
> > > Bart
> > >
> > > Many thanks for your tip. I use semi flexible polypropylene orthoses
> > > and see a lot of marathon runners and triathletes who do Ironman
> > > distance i.e. with a half or full marathon at the end. They obviously
> > > get very sweaty but also get blisters when they are training at the
> > > individual events. Sometimes the blisters occur under the
> navicular or
> > > more distal up the 1st MPJ, regardless of whether the orthotic has a
> > > full length top cover/ extension. I even get blisters myself
> when I run
> > > sometimes and was interested in Bruce Williams theory that the medial
> > > control in the running shoes may be the cause and be creating
> a Fhl type
> > > problem. I certainly wear a anti pronatory type shoe with my
> orthotics.
> > > I previously got anterior shin pain with a neutral shoe and the same
> > > orthoses.
> > >
> > > Regards
> > > Jacqui
> > >
> > > Jacqui Baggaley
> > > Trinity Chiropody & Podiatry Clinic
> > > 196 Ferry Road
> > > Edinburgh EH6 4NW
> > > Tel W 0131 476 9889
> > >
> > > -----Original Message-----
> > > From: A group for the academic discussion of current issues
> in podiatry
> > > [mailto:[log in to unmask]] On Behalf Of Bart Van Gheluwe
> > > Sent: 13 April 2004 10:01
> > > To: [log in to unmask]
> > > Subject: Re: MLA blisters in athletes
> > >
> > > Hello Jacqui,
> > >
> > > The blister problem you described is a familiar one to us when using
> > > non-rigid insoles with soft materials.
> > > With our patient, this has mainly to do with the nature of the soft
> > > insole
> > > material, the quantity of sweat produced and the skin
> sensibility of the
> > > patient`s foot.
> > > My colleague podiatrists mostly get the blister problem solved by
> > > covering
> > > the insoles with what we call "goat skin". It is a vey thin and light
> > > leather like covering . It is even not necessary to cover the whole
> > > insole
> > > with it, just the medial area where the blisters occur.
> > > Hope this may be of nay help.
> > > Regards,
> > > Bart
> > >
> > > *******************************************************************
> > > Bart Van Gheluwe
> > > Laboratory of Biomechanics
> > > Vrije Universiteit Brussel -Fac. LK
> > > Vakgroep BIOM
> > > Pleinlaan 2, 1050 Brussel, Belgium
> > > Tel.: 02/629.27.33 (31)
> > > Fax: 02/629.27.36
> > > *******************************************************************
> > >
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