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Knee-Ankle-Foot Orthoses (KAFOs)

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Presentation on theme: "Knee-Ankle-Foot Orthoses (KAFOs)"— Presentation transcript:

1 Knee-Ankle-Foot Orthoses (KAFOs)
ORTHOTIC SYSTEMS Knee-Ankle-Foot Orthoses (KAFOs)

2 KAFOs Designs Materials Uprights Joints Control Components

3 KAFOs Designs Metal Plastic Hybrid

4 KAFO Materials Metal KAFOs Uprights Bands Joints Stirrups Leatherwork

5 KAFO Materials Plastic KAFOs Thermoplastics Uprights Joints Straps

6 KAFO Uprights Aluminum Stainless Steel Lightweight
Heavier but stronger

7 KAFO Knee Joints Free/limited motion Locking

8 KAFO Knee Joints Single Axis Free Motion Controls hyperextension
When M-L control is needed

9 KAFO Knee Joints Offset Free Motion Axis is posterior
Increased knee extension stability

10 KAFO Knee Joints Polycentric Free Motion Multiple axes of motion
More closely approximates instantaneous axis of rotation in anatomical knee joint

11 KAFO Knee Joints Drop Lock
Metal ring drops over top of joint, preventing flexion Simplest of locks

12 KAFO Knee Joints Bale Lock
Both locks are connected by metal hoop, or bale Locks are disengaged by pulling bale up Locks engage automatically when orthosis is extended

13 Metal KAFO Ankle Joints
Free motion Dorsiflexion assist Double-action

14 Metal KAFO Ankle Joints
Free/Limited Motion ROM determined by stirrup head shape

15 Metal KAFO Ankle Joints
Dorsiflexion Assist Posterior spring creates dorsiflexion moment

16 Metal KAFO Ankle Joints
Double-action Anterior & posterior channels allow for insertion of pins and/or springs to provide various combinations of ROM and assist

17 Plastic KAFO Ankle Joints
Free or limited motion Variable motion

18 Plastic KAFO Ankle Joints
Tamarack Flexible with no ROM control One variant can produce dorsiflexion assist DF Assist Neutral

19 Plastic KAFO Ankle Joints
Oklahoma More rigid than Tamarack with single axis of motion No inherent ROM control

20 Plastic KAFO Ankle Joints
ROM Controls Molded into plastic at time of fabrication Used in conjunction with previous joints to limit or influence ROM Adjustable Stop Dorsiflexion Assist

21 Plastic KAFO Ankle Joints
Friddle Variable Motion Allows fixed or variable ROM Cannot be adjusted on patient

22 Plastic KAFO Ankle Joints
Camber ankle joint Cams are installed to create limited ROM One of several designs using interchangeable components to produce specific ROM

23 Plastic KAFO Ankle Joints
Laminated foot plate w/ stirrup Used when high stress or activity is anticipated Allows for use of metal ankle joints

24 KAFO Control components
Supra/Infra Patellar Pads Generates extension moments above and below knee axis

25 KAFO Control components
Full knee control pad/strap Generates extension moment over patella which is actually above knee axis May have flange (shown) to provide M/L control

26 KAFO Control components
Adjustable extension component Position of serrated ring over serrated disc determines point of full extension Useful for knee flexion tightness/contractures

27 KAFO Control components
Quad/Narrow M-L Brim Provides method to un-weight knee and distal extremity during stance phase

28 KAFO Control components
Hip joints/Pelvic band Created increased hip and trunk stability Some designs generate a reciprocating action to produce a swing-through gait

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