transfemoral orthosis Flashcards
components of transfemoral orthosis
socket
femoral ext
mech knee
tibial ext
foot
QL socket
quadrilateral - most common
WB is at ischial tub
IRC
ischial ramus containment
encompasses ramus and has bone lock - better WB than QL
more diff to cast and depends if pt can handle
MAS
marlo anatomical socket
modern IRC
subischial socket
mod IRC
compare stance phase control and swing phase control in knee
stance
- manual lock
- weight activated
- hydraulic knee
- free
swing
- mech friction
- ext assist
- pneumatic knee
- hydraulic knee
single axis knee
can flex and ext
manual lock and free knee joint
- can be controlled if pt is strong enough
polycentric knee
better stab in gait since it has instantaneous center of rot - mimic knee
good for long stump - makes jt shorter when it folds
discuss stance phase control
manual lock
- attached to socket
- if locked pt cant flex; pull = flex and pt can sit
weight activated
- weight = ext and no flex
= helps c stab during gait
hydraulic
- liquid that regulates stance
free
- no control
- for pt c strong muscles
discuss swing phase control
friction
- in free knee
- more friction = tighter mechanism
extension assist
- internal: inside knee jt
- external: external strap or spring compressed in flexion = help socket ext
pneumatic
- compressed air
hydraulic
- liquid that regulates swing
dicuss shank
can be exo or endo
suction or vaccum suspension
at distal end
push = releases air
only works if fit is good
silesian belt suspension
cheapest and easy but easily worn out but also easy to repair
rigid pelvic band suspension
metal band covered in leather and has a mechanical joint outside
total elastic suspension
elastic material on socket
strap going around pt torso
