KAFO Flashcards
KAFO metal design with thigh component; used for patients with SCI
Key design factor: ankle in 10° dorsiflexion
Scott-Craig Orthosis
Orthotic stability of knee, ankle and foot, passive ligament stability at hip
Scott-Craig Orthosis
Components of KAFO
AFO + 2 Metal uprights
+ mechanical knee jt. + two thigh bands
Allows knee flexion but prevents hyperextension with hyperextension stop
For recurvatum or mediolateral instability
METAL DESIGN: Single axis, straight set
Unrestricted knee flexion and extension with hyperextension stop
Also for for recurvatum or mediolateral instability
METAL DESIGN: Polycentric knee joint (Double axis)
Axis is posterior to uprights;
This orthosis allows knee to bend during swing phase and permit sitting
METAL DESIGN: Posterior Offset
NOT used in knee or hip flexion contracture and AFO with plantarflexion stop
METAL DESIGN: Posterior Offset
Most common knee lock;
With catching mechanism in 12 degree increments
Ratchet Lock
Knee lock that controls flexion; attached to both uprights making it simple, effective, & sturdy
May bind in knee flexion contracture or spasticity
Drop-ring
Easier to release with a flexion force;
Lever arm (bail) attached to the pawl needs to be pulled upward for release
Pawl lock
Also called French, Schweitzer, or Swiss lock
Pawl lock
Used to stabilize the knee in varying amounts of flexion;
More precise for knee flexion contracture
Dial lock
Variants of metal KAFO design;
Lacks medial upright
Single upright orthosis
KAFO that accommodates longitudinal and circumferential growth
KAFO plastic-metal design
Components of plastic-metal design KAFO
AFO + Plastic shells + metal uprights attached by screws or rivets + knee joint + straps
_______ of proximal thigh shell control rotation
Quadrilateral shape
Can incorporate ischial seat for weightbearing
KAFO plastic-metal design
KAFO plastic design that resists recurvatum & provides mediolateral stability;
Indicated for knee extensor weakness
Supracondylar KAFO
_________ portion of plastic KAFO design limits subtalar motion and places the ankle in slight plantarflexion
Distal
Drawbacks of Supracondylar KAFO
Proximal portion protrudes in sitting; NOT for bilateral use
Indications for PLASTIC and PLACTIS-METAL design
For close fit, precise control of pressure, & maximum foot control
