KO Flashcards
Components of KO
Thigh & calf cuffs joined by side bars
Flexion-extension joint
Pressure pad
Primarily protects knee from mediolateral forces
Pressure pad
Flexion–extension control through ______________
Hyperextension stop or drop lock
Typical KO may incorporate _______ to follow natural motion of anatomical knee joint
Polycentric joint (double axis)
2 basic designs for polycentric joint in KO
2 meshing gears (fixed) or plate with 2 pivots (adapts)
Variant of typical KO from thermoformed plastic with more accurate force application and
distribution
Miami
In the Miami KO variant, the ______ wedge prevent
downward slippage
Medial suspension
CARS-UBC
Canadian Arthritis Research Symposium-Univ. British Columbia
Consists of 2 plastic cuffs connected by telescoping
rod that is placed laterally (valgum) or medially (varum)
Canadian Arthritis Research Symposium-Univ. British Columbia
KO variant with NO control of axial rotation
CARS-UBC
Restricts hyperextension but with not much mediolateral stability
Swedish knee cage
More cosmetic because of pivotal strap attachment;
Has lateral and medial uprights that gives slight
mediolateral stability
Three-way knee stabilizer
More control of recurvatum with firm mediolateral stabilization
It does not interfere with knee flexion and has rigid support
Supracondylar KO
Suprapatellar portion protrudes in sitting
Supracondylar KO
Provides angular control in
frontal and sagittal planes
KO axial control (Lennox Hill Derotation Orthosis & Lerman Multi-ligamentous knee control orthosis)
This is to limit flexion (3)
- Anteriorly directed force on posterior proximal thigh
- Posteriorly directed force on anterior surface of the knee (either directly over the patella or a combination of support just proximal and just distal to the patella)
- Anteriorly directed force on posterior aspect of the calf
Most commonly with medial
compartment narrowing
OA KO
Drawback of OA KO
Cannot support adequately
with obese person.
Foam is added, which encircles the knee below the patella;
Worn during activity
Infrapatellar strap
Elastic sleeve with patella cutout
Palumbo
Palumbo as 2 circumferential rubber straps which provides _____________ to patellar pad
dynamic tension
The 1 counterforce strap in Palumbo maintains pad position & avoid _____
axial rotation
