Knee Orthoses and KAFO's types Flashcards
varus or valgus control?
valgus control
valgus or varus control?
varus control
name each number
- Shell
- Uprights
- Straps
disadvantages of single axis KAFO
mechanical and anatomical axis do not match (mechanical does not roll and slide) → creates stress
polycentric hinges
better axis of rotation, but heavier and can break
KAFO knee joint alignment types
- in-line
-
Off set: axis posterior to the uprights
- GRF is anterior to axis of rotation
- produces extension moment
drop or gravity locks
- Locks in extension
- Need to be manually unlocked:
- UE strength and balance control
- May have a high level release ring
pawl lock with bale release
- 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
step / ratchet lock
- Allow motion into extension, sound heard
- Locks every certain amount of degrees to prevent flexion as patient moves into stance
- Manual release mechanism
variable motion system
- Post surgery (ACL repair)
- Can set ROM
- Allows for function and protection
weight activated knee joint AKA Stance Control Knee Ankle Foot Orthosis (SCKAFO)
- automatically allows knee flexion during swing
- prevents knee flexion during stance
- becomes unlocked due to position of GRF and ankle ROM (no electronics)
computerized knee
- foot plate signals
- prevent knee buckling
- expensive, heavy
- not seen much
types of knee orthoses
- functional
- rehabilitative
- unloaders
- supportive
- Supportive &/ or functional also used to try prevent injury
Functional knee orthoses
- jointed or unjointed
- provide support for ligamentous laxity
- allows free flexion and extension
- they slip with mvmt
Swedish knee cage
- functional knee orthoses
- post CVA: no quadriceps control yet. Temporary!
- no moving parts
- prevents knee from hyperextending
Rehabilitative knee orthosis
- post knee injury or Sx
- adjustable ROM
unloader knee orthoses
indications for supportive knee devices
- Patellofemoral syndrome
- patella subluxation
- infra-patellar tendonitis
true or false: the literature shows that supportive knee orthoses devices have a significant biomechanical effect
false, have no biomechanical effect,
but have a big psychological effect
