Orthotic Manufacturing Flashcards

1
Q

what position is the calcaneal bisection as the positive is made

A

perpendicular to the ground

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2
Q

when i the negative cast removed

A

when the plaster is hardened

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3
Q

what are the types of positive plaster modifications

A
  • FF platform
  • heel cup accommodation
  • arch fill
  • “sweet” spots
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4
Q

how is a FF platform created

A
  • nail is placed on the plantar sufrace of the 1st (for FF varus) OR 5th (for FF valgus) MT head to prop up the positive in the appropriate position
  • plaster is applied to build a platform at an angle dictated by the position of the nail
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5
Q

where is the calcaneal bisection when forming a FF platform

A

-perpendicular to the ground or FF may be “balanced” to RF

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6
Q

for a FF varus, where will the FF platform me thicker

A

medially

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7
Q

fore a FF valgus, where will the platform be thicker

A

laterally

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8
Q

how is a heel cup accommodation added

A

plaster is added around the periphery of the heel

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9
Q

what does a heel cup accommodation allow for

A

-soft tissue spread when the patient bears weight

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10
Q

where are arch fills added

A

to the medial arch to allow for soft tissue expansion and to provide a smooth transition into the FF platform

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11
Q

a minimal arch fill will provide for

A

greater control

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12
Q

a heavier arch fill will allow for

A

more flattening of the arch

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13
Q

how do you accommodate for “sweet spots”/bony prominence

A

add a small mound of plaster to the area of the prominence which will then lead to a pocket on the shell

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14
Q

what are the material requirements for the shell

A

heat moldable

able to hold their shape

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15
Q

where does a standard functional device extend to

A
  • just proximal to the MT heads distally
  • to the centre of the 1st MT medially
  • to the centre of the 5th MT laterally
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16
Q

is the device width dependent upon foot width

A

no!

17
Q

the wider the device the —

A

greater the control

18
Q

the width of the device is highly dependent upon

A

the type of shoe in which the device will be work

19
Q

a wide device extends from

A

the medial side of the 1st MT head to the lateral side of the 5th MT head

20
Q

a normal device extends from

A

the centre of the 1st to the centre of the 5th

21
Q

a narrow device extends from

A

the lateral aspect of the 1st MT head to the medial aspect of the 5th MT head

22
Q

where is an extrinsic RF post applied to

A

the shell

23
Q

is an extrinsic post the same thing as a heel lift

A

No!

24
Q

how do functional devices work

A
  • prevent excessive pronation
  • allow the STJ to function around its neutral position
  • prevent compensation
25
Q

what are 3 functional device theories

A
  1. pre-positioning of the foot
  2. proprioceptive facilitations
  3. altering the extrinsic moments
26
Q

pre-positioning of the foot means that

A
  • STJ neutral position
  • MTJ maximally pronated (locked) position b/c that is the ideal position of the foot in the middle of midstance as it prepares for the propulsive phase of gait
27
Q

what phase of gait do most pathologies occur

A

propulsive phase

28
Q

functional orthosis generally cannot control the motion of the foot during the propulsive phase, why?

A

-b/c so little of the foot (only the MT heads) is actually weight bearing

29
Q

how do functional orthosis help control motion of the foot

A
  • by placing the foot in an optimum position as it enters the propulsive phase
  • theoretically, the deleterious stresses will be minimized
30
Q

how can orthoses prevent excessive pronation

A
  • providing increased proprioceptive clues
  • allowing the patient to respond to the rate and amount of pronation more appropriately
  • the more direct contact you have on the plantar surface, the more cues you have about where your body is in space
31
Q

what is posting

A
  • bringing the ground up to the deformity

- eliminating the need for compensation

32
Q

arch support provides for

A
  • increased proprioceptive feed back

- allows for a surface in which posting may be used

33
Q

does posting bring the ground up to the MT heads

A

NO!

Functional orthosis does not control MT head contact to the ground

33
Q

how are osseous restraining mechanisms optimized

A

-by placing the foot in a more stable position

33
Q

which part of the orthosis help prevent excessive pronation

A
  • distal medial shell
  • anterior medial edge of the RF post
  • “anti-pronatory” pressure (extrinsic supinatory moment) at the distal medial calcaneal tuberosity (as determined by the contour of the heel cup)
34
Q

a deep heel cup provides for —- compared to a lesser heel cup

A

greater control

35
Q

do functional orthosis function as an arch support

A

NO!

The arch area of the device is not a component to control pronation

35
Q

heel cup helps control

A
  • STJ motion

- minimize the amount of calcaneal inversion and eversion

35
Q

control of the lateral column provides for

A

increased stability of the foot