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8531 Prosthetics > Prosthetic Knee Chart > Flashcards

Prosthetic Knee Chart Flashcards

1
Q

Alignment stability: manual locking

A

Most

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2
Q

Alignment stability: outside hinges

A

Least

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3
Q

Alignment stability: single axis

A

Low

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4
Q

Alignment stability: polycentric

A

High

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5
Q

Amputee stability: manual locking

A

None needed

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6
Q

Amputee stability: outside hinges

A

High

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7
Q

Amputee stability: conventional

A

High

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8
Q

Amputee stability: polycentric

A

Low

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9
Q

Indications: manual locking

A
  • last resort

- usually for post-op instability

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10
Q

Indications: outside hinges

A

Knee disarticulation ONLY

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11
Q

Indications: conventional

A
  • long limb with good voluntary control

- rarely used

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12
Q

Indications: polycentric

A
  • knee disarticulation

- short or long TF RL

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13
Q

Indications: polycentric (K levels

A

K 2-4 for low-mod impact activities

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14
Q

Advantages: manual locking

A

Most stable

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15
Q

Advantages: conventional

A
  • durable

- inexpensive

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16
Q

Advantages: polycentric

A
  • excellent stability
  • knee center symmetry
  • good swing clearance
17
Q

Disadvantages: manual locking

A
  • gait deviations

- needs to be short to facilitate swing

18
Q

Disadvantages: outside hinges

A
  • poor cosmesis

- knee axis asymmetry

19
Q

Disadvantages: conventional

A

Poor stability

20
Q

Disadvantages: polycentric

A
  • not heavy duty
  • increased weight
  • requires charging
21
Q

Pneumatic, hydraulic, and microprocessor knees all fall under this category

A

Polycentric

22
Q

Swing control types

A
  • extension aid and mechanical friction
  • pneumatic
  • hydraulic
  • microprocessor controlled
23
Q

Advantages: extension aid and mechanical friction

A
  • durable

- low cost

24
Q

Advantages: pneumatic

A
  • increased resistance with increased cadence

- unaffected by temp changes

25
Q

Advantages: hydraulic

A
  • increased resistance with increased cadence (very slow to very fast)
26
Q

Advantages: microprocessor

A
  • adjusts resistance instantly based on flex/ext angle and foot contact
  • allows controlled descent
  • more knee flexion ROM
27
Q

Disadvantages: extension aid and mechanical friction

A
  • constant speed (doesn’t adjust to cadence)
  • may loosen
  • debris may interfere
28
Q

Disadvantages: pneumatic

A

high speeds may overpower available resistance

29
Q

Disadvantages: hydraulic

A
  • high cost

- high weight

30
Q

Disadvantages: microprocessor

A
  • high cost
  • high weight
  • sensitive to moisture
  • etc.
31
Q

Braking (stance control): manual locking

A

N/A (locked)

32
Q

Braking (stance control): outside hinges, conventional, ext aid and friction, pneumatic, hydraulic

A
  • stance control: knee in ≤ 15˚ flexion

- aka weight activated or “safety knee”

33
Q

Braking (stance control): microprocessor knee

A
  • Active

- ≤ 35˚

8531 Prosthetics (16 decks)

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