ORTHOTIC SYSTEMS Knee-Ankle-Foot Orthoses (KAFOs).
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Transcript of ORTHOTIC SYSTEMS Knee-Ankle-Foot Orthoses (KAFOs).
![Page 1: ORTHOTIC SYSTEMS Knee-Ankle-Foot Orthoses (KAFOs).](https://reader038.fdocuments.net/reader038/viewer/2022102814/5518301b550346a7318b4fa8/html5/thumbnails/1.jpg)
ORTHOTIC SYSTEMS
Knee-Ankle-Foot Orthoses (KAFOs)
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KAFOs Designs Materials Uprights Joints Control
Components
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KAFOs
Designs Metal Plastic Hybrid
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KAFO Materials Metal KAFOs
Uprights Bands Joints Stirrups Leatherwork
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KAFO Materials Plastic KAFOs
Thermoplastics Uprights Joints Straps
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KAFO Uprights Aluminum
Lightweight Stainless Steel
Heavier but stronger
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KAFO Knee Joints Free/limited motion Locking
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KAFO Knee Joints Single Axis Free
Motion Controls
hyperextension When M-L control is
needed
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KAFO Knee Joints Offset Free Motion
Axis is posterior Increased knee
extension stability
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KAFO Knee Joints Polycentric Free
Motion Multiple axes of
motion More closely
approximates instantaneous axis of rotation in anatomical knee joint
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KAFO Knee Joints Drop Lock
Metal ring drops over top of joint, preventing flexion
Simplest of locks
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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
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Metal KAFO Ankle Joints Free motion Dorsiflexion assist Double-action
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Metal KAFO Ankle Joints Free/Limited
Motion ROM determined by
stirrup head shape
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Metal KAFO Ankle Joints Dorsiflexion Assist
Posterior spring creates dorsiflexion moment
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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
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Plastic KAFO Ankle Joints
Free or limited motion
Variable motion
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Plastic KAFO Ankle Joints
Tamarack Flexible with no
ROM control One variant can
produce dorsiflexion assist
DF Assist Neutral
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Plastic KAFO Ankle Joints Oklahoma
More rigid than Tamarack with single axis of motion
No inherent ROM control
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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
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Plastic KAFO Ankle Joints Friddle Variable
Motion Allows fixed or
variable ROM Cannot be adjusted
on patient
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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
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Plastic KAFO Ankle Joints Laminated foot
plate w/ stirrup Used when high
stress or activity is anticipated
Allows for use of metal ankle joints
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KAFO Control components Supra/Infra Patellar
Pads Generates
extension moments above and below knee axis
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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
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KAFO Control components Adjustable extension
component Position of serrated ring
over serrated disc determines point of full extension
Useful for knee flexion tightness/contractures
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KAFO Control components Quad/Narrow M-L Brim
Provides method to un-weight knee and distal extremity during stance phase
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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