Soft; medial post
Soft; lateral post
Rigid; medial post
Rigid: lateral post
Rigid, medial post
Rigid, lateral post
Soft, medial post
Soft, lateral post
Low temp thermoplastic
High temp thermoplastic
Closed cell polyethylene foam
Open cell polyethylene foam
It doesn't breathe.
It doesn't deform in the direction of stress.
Stress is force over tissue surface area.
Strain is the tissue's change in shape when stress is applied
The steeper the stress/strain curve, the more ductile the material.
The steeper the stress/strain curve, the more brittle the material.
Elevate the sole on the L
Elevate the heel on the L
Wedge the heel laterally
Wedge the heel medially
For every one degree of posting, there will be one mm of lift.
The FF can tolerate higher posting than the RF.
If > 12 degrees, divide posting between RF and FF.
If 6* or less, post 90-100% of the deformity.
Bevel the lateral heel.
Flare the lateral heel.
Bevel the posterior heel.
Flare the posterior heel.
In the open kinetic chain, movement occurs both distal and proximal to the STJ axis.
CKC pronation is calcaneal eversion and talar adduction/PF.
OKC pronation is calcaneal eversion, adduction, and DF.
Pronation causes varus stresses at the knee.
That the foot must be in neutral position to be balance.
Neutral position is a position of neither supination or pronation.
FF and RF deformities do not affect alignment.
We must check STJ neutral and PROM and post depending upon what we see in NWB.
Orthotic effectiveness is due to muscular response changes, not changes in joint alignment.
Orthotic devices should provide total surface contact to medial longitudinal arch and be dynamic.
THe foot should be in a neutral alignment and deformities should be corrected.
Altered muscle activation
Altered sensory input
Controlled motion by changing joint alignment
Muscle response is changed
Are parallel, mobile
Are parallel, rigid