KAFO PPTs Flashcards
Indications for metal and leather
max strength, durability
obesity
fluctuating edema
Indications for thermoplastic
total contact for max limb control
need for reduced weight for energy expenditure
transverse motion control
GRAFO indications
mild quad weakness (3/5 or better)
knee flexion contracture must be under 20*
Knee joint types
single axis posterior offset polycentric variable position stance control
Single axis knee joints
mild to moderate genu varum/valgum
contra: flail knee, KF contracture
Posterior offset knee joints
moderate genu recurvatum
“hyperextension stop”
Polycentric knee joints
usually used for self-suspending orthoses to track the knee axis more closely
Locked knee joints
paralysis
severe genu varum/valgum or recurvatum
How do posterior offset knee joints work?
if the mechanical axis of the knee joint is placed posterior to the bars, the ox knee tends to extend when wt is put thru the bars
may stabilize the knee w/o any lock
Lock types
drop
bail
trigger (modified bail)
Drop locks
knee must be fully extended to engage
requires dexterity and balance to disengage
Bail lock
spring connects uprights so they lock/unlock simultaneously
pressure against posterior (chair) activates them, but accidental bumping can cause falls
Trigger/modified bail lock
release is located at prox thigh to minimize trunk lean to unlock
Dial lock knee joint
set at desired angle
adjustable
accommodates KF contractures
always locked
Stance control
for pt's w/ quad weakness need hip flexion strength 3+/5 locked knee for stance unlocked knee for swing activated by ankle, hip, or weight
