Knee Orthoses and KAFO's types Flashcards Preview

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Flashcards in Knee Orthoses and KAFO's types Deck (19)
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1
Q

varus or valgus control?

A

valgus control

2
Q

valgus or varus control?

A

varus control

3
Q

name each number

A
  1. Shell
  2. Uprights
  3. Straps
4
Q

disadvantages of single axis KAFO

A

mechanical and anatomical axis do not match (mechanical does not roll and slide) → creates stress

5
Q
A

polycentric hinges

better axis of rotation, but heavier and can break

6
Q

KAFO knee joint alignment types

A
  1. in-line
  2. Off set: axis posterior to the uprights
    • GRF is anterior to axis of rotation
    • produces extension moment
7
Q

drop or gravity locks

A
  • Locks in extension
  • Need to be manually unlocked:
    • UE strength and balance control
  • May have a high level release ring
8
Q

pawl lock with bale release

A
  • same as with the gravity lock, but with a larger unlocking system
  • locks in extension
  • unlocks when bale is pulled upwards
  • can be unlocked with the edge of the seat
  • can be mistakenly released during gait
9
Q

step / ratchet lock

A
  • Allow motion into extension, sound heard
  • Locks every certain amount of degrees to prevent flexion as patient moves into stance
  • Manual release mechanism
10
Q

variable motion system

A
  • Post surgery (ACL repair)
  • Can set ROM
  • Allows for function and protection
11
Q

weight activated knee joint AKA Stance Control Knee Ankle Foot Orthosis (SCKAFO)

A
  • automatically allows knee flexion during swing
  • prevents knee flexion during stance
  • becomes unlocked due to position of GRF and ankle ROM (no electronics)
12
Q

computerized knee

A
  • foot plate signals
  • prevent knee buckling
  • expensive, heavy
  • not seen much
13
Q

types of knee orthoses

A
  • functional
  • rehabilitative
  • unloaders
  • supportive
  • Supportive &/ or functional also used to try prevent injury
14
Q

Functional knee orthoses

A
  • jointed or unjointed
  • provide support for ligamentous laxity
  • allows free flexion and extension
  • they slip with mvmt
15
Q

Swedish knee cage

A
  • functional knee orthoses
  • post CVA: no quadriceps control yet. Temporary!
  • no moving parts
  • prevents knee from hyperextending
16
Q

Rehabilitative knee orthosis

A
  • post knee injury or Sx
  • adjustable ROM
17
Q

unloader knee orthoses

A
18
Q

indications for supportive knee devices

A
  • Patellofemoral syndrome
  • patella subluxation
  • infra-patellar tendonitis
19
Q

true or false: the literature shows that supportive knee orthoses devices have a significant biomechanical effect

A

false, have no biomechanical effect,
but have a big psychological effect