18/19: Orthotic Materials and Construction - Cronin Flashcards

1
Q

factors that affect selection of material thickness

A
  • forces to be resisted
  • body weight
  • age
  • activity
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2
Q

factors that affect selection of materials for top covers

A
  • diabetic foot protection
  • need for cushion
  • need for support
  • durability of material
  • memory of material
  • thin cover for dress shoes
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3
Q

posting materials

A
  • cork
  • crepe
  • EVA
  • felt (diagnostic purposes)
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4
Q

how was the positive cast created?

A

pouring of the negative cast

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5
Q

why is the negative cast bisected?

A
  • negative cast is bisected to determine the forefoot to rearfoot relationship
  • bisection technique- lateral curvature method
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6
Q

how do you mark the lateral expansion?

A
  • begins at the proximal lateral corner of the square represent the lateral platform and ends where the distal heelcup line and the lateral heel cup height intersect
  • lateral expansion is meant to accommodate for soft tissue spread
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7
Q

where will the balance platform be placed for an inverted forefoot?

A

beneath the first met head

  • the balance platform will be placed beneath the fifth met head to balance for everted forefoot
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8
Q

why is the lateral edge straight?

A
  • horizontal grind is made along the lateral edge of the orthosis enusring thta tthe lateral heelcup height is maintained
  • straight lateral edge also prevents the foot from pronating off the orthosis
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9
Q

what is the purpose of the rearfoot post?

A
  • stabilizes the orthosis shell
  • stops excessive calcaneal eversion
  • allows normal pronation-shock absorption
  • normal pronation is accomplished by adding motion
  • post motion is provided by grinding the medial plane
  • amount of post motion is determined by sagittal plane inclination angle of the STJ axis
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10
Q

what determines the height of the heelcup?

A

the height and width of the heel counter in the shoe

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