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Prosthetics > Prosthetic Feet > Flashcards

Prosthetic Feet Flashcards

1
Q

What is happening to the foot in the early stance of gait

A

Human foot is flexible and it accommodates to uneven terrain and maintains balance

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2
Q

What is happening to the foot in the end of stance of gait

A

Human foot converts to a rigid lever arm for push off at preswing

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3
Q

What are 2 functional tasks that occur in early stance from initial contact to loading response

A
  1. Shock absorption-knee flexion moment

2. Transition to foot flat position: GRF is posterior to ankle creating a PF moment driving the foot to the floor

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4
Q

How does the prosthetic foot simulate the muscle activity that is occuring during midstance of gait

A

Through rigid/semi-rigid or flexible keel foot

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5
Q

What is a keel

A

The center line of the foot

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6
Q

True or False:
We want to decrease the amount of force placed on the sound side foot in patients with compromised vascular and neurologic systems

A

True

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7
Q

What are the 4 categories of prosthetic feet

A
  1. Non-articulating
  2. Articulating
  3. Elastic keel
  4. Dynamic response
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8
Q

What is an example of a non-articulation prosthetic foot

A

SACH (solid ankle cushioned heel)

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9
Q

What is an example of an articulating prosthetic foot

A
  1. Single axis

2. Multiaxial

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10
Q

What is an example of an elastic keel prosthetic foot

A
  1. SAFE (solid ankle flexible exoskeleton

2. STEN (stored energy)

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11
Q

What is an example of a dynamic response prosthetic foot

A
  1. Seattle
  2. Flex foot
  3. Springlite
    4 Pathfinder
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12
Q

What motions occur with a SACH foot

A

PF and DF only

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13
Q

When is the keel active in a SACH foot

A

Push-off

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14
Q

When is the heal active in a SACH foot

A

Heel strike

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15
Q

What is the keel made of

A

Wood or plastic

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16
Q

Why does the keel only running half to 3/4 of the way down the foot cause a problem

A

There isn’t a stable surface to push off of causing more knee flexion

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17
Q

What does a short keel result in

A

Rolling onto rubber causing knee flexion resulting in falling down to the ground

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18
Q

True or False:

New keels run the entire length of the SACH foot

A

True

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19
Q

What determines when PF occurs in a SACH prosthetic foot

A

The squishiness of the heel

20
Q

What happens if the heel of a SACH foot is too squishy

A

PF at the ankle and hyperextension at the knee

21
Q

What happens if the heel of a SACH foot is too firm

A

DF at the ankle and flexion at the knee

22
Q

What motions does a single axis/exoskeletal prosthetic foot allow

A

PF and DF

23
Q

What do the bumpers in a single axis/exoskeletal prosthetic foot do

A

Resist compression

24
Q

What motions does a multiaxial/exoskeletal prosthetic foot allow

A

PF, DF, IV, and EV

25
Q

What is an elastic keel

A

Rubberized material that runs all the way to the toes

26
Q

Where does the keel extend in a dynamic response prosthetic foot

A

Top of the prosthesis

27
Q

What does the keel extending to the top of the prosthesis in a dynamic response prosthetic foot allow for

A

Motion and loading of the shin area

28
Q

What allows for IV and EV in a dynamic response prosthetic foot

A

The split down midline

29
Q

True or False:
A dynamic response prosthetic foot is better for a tall person because of the longer keel allowing more loading and motion

A

True

30
Q

In a dynamic response foot with a pneumatic/hydraulic pump what does adding more air do

A

Leads to less compression so less PF and hyperextension at the knee occur

31
Q

In a dynamic response foot with a pneumatic/hydraulic pump what does removing air do

A

Leads to more compression so more PF and hyperextension at knee

32
Q

True or False:

The foot should be relatively horizontal to the sole

A

True

33
Q

How big is the standard prosthetic foot heel

A

3/4”

34
Q

How big is an athletic prosthetic foot heel

A

3/8”

35
Q

How is a western boot prosthetic foot heel

A

2”

36
Q

What is looked at when choosing an appropriate foot (8)

A
  1. Heel height
  2. Ability to resist moisture
  3. Cosmetic appearance of toes
  4. Prosthetic user’s activity level
  5. Ability or potential to reach a higher level
  6. Vocational/recreational
  7. Maintenance/distance to prosthetist
  8. Team effort/clinic team
37
Q

What is used to label the prosthetic user’s ability or potential

A

Medicare K levels

38
Q

How many medicare K levels are there

A

5, K0-K4

39
Q

What is K0

A

To ambulate or transfer safely with or without assistance and a prosthesis does not enhance QOL or mobility

40
Q

What is K1

A

To use a prosthesis for transfers, or ambulation on level surfaces at a fixed cadence

41
Q

What is K2

A

Transverse low level barriers, curbs, stairs or uneven surfaces, limited community ambulator

42
Q

What is K3

A

Variable cadence beyond simple walking

43
Q

What is K4

A

Ambulatory skills, high impact, children, active adults, and athletes

44
Q

What type of foot is available for K1 and K2

A

Simplest feet (SACH)

45
Q

What type of foot is available for K3 and K4

A

Dynamic response feet and more complex

46
Q

Who determines the K level

A

The physician

Prosthetics (8 decks)

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