Random info Flashcards
FFC rule of law
fit, function, cosmetics
3 overall goals in TT biomechanics
- increased WB capacity of the residual limb
- medial-lateral stabilization in stance phase
- anterior-posterior knee control throughout stance phase
7 weight-tolerant areas in TT limb
- patellar tendon
- medial tibial flare
- pre-tibial muscles
- posterior distal aspect of the limb
- popliteal fossa
- fibular shaft
- hydrostatic
how much lateral shift occurs at mid-stance?
about 1 cm
2 overall goals in AK (TF) biomechanics
- achieving medial-lateral stability
- keeping knee stable throughout the stance phase
center of rotation in TF amputee
ischium
true or false? stabilized femur = stabilized pelvis?
true
does the varus moment production change after a TF amputation?
no, b/c the amputee bears most of his weight on the ischium which is considered the point or fulcrum about which the varus moment occurs
The _____ the varus moment, the _____ the lateral stabilizing force needed to oppose it. Therefore the _____ the force, the ______ the pressure on the femur.
greater; greater; greater; greater
there is a _____ relationship between functional ability and risk of injury
inverse
TKA line in front of the knee joint axis
inherently stable
TKA line through knee joint axis
less stable, but affords the wearer more voluntary control over knee function
how long is a temporary prosthesis worn?
4-12 weeks; average = 6 weeks
when is a first definitive prosthesis made?
18 months to 2 years
TT contracture limit (degrees)
> 30 hip flexion
TF contracture limit (degrees)
> 10 knee flexion
TT pressure tolerant areas
- patellar tendon
- shaft of fibula
- DF m. lateral to tibial crest
- tibial shaft medial to crest
- popliteal space
- PF m.
TF pressure tolerant areas
- ischial tuberosity
- gluteus max
TT pressure sensitive areas
- fibular head
- tibial tubercle
- tibial crest
- cut ends of tibia and fibula
- medial and lateral HS tendons
TF pressure sensitive areas
- cut ends of femur
- pubic ramus
- adductor longus
TT componentry
- foot/ankle
- shank
- socket
- suspension
foot/ankle types
articulated and non-articulated
non-articulated foot/ankle types
SACH and dynamic response/energy storing
SACH foot/ankle
- wood keel
- no motion
- on un-level terrain torque is taken as RL interface
dynamic response/energy storing foot/ankle
- carbon graphite
- flexible keel
- torque is taken at foot
articulated foot/ankle types
- single axis
- multi-axis
- bionic
single axis foot/ankle
- PF/DF
- allows foot to maintain contact with ground
multi-axis foot/ankle
- some motion in all planes
bionic foot/ankle
- not for runners
shank
wood, plastic, or metal pylon with foam rubber; endo- or exo-skeleton
socket alignment
aligned on shank in slight flexion and lateral tilt
socket types
- PTB: uses liners (silicone, urethane, polyethylene) and socks
- hydrostatic: total contact
suspension types
- supracondylar cuff (with forl strap or waist belt)
- Supracondylar suspension with medial wedge (med/lat stability)
- Supracondylar/suprapatellar suspension
- Roll-on sleeve with locking pin
- Thigh corset
TF componentry
- foot/ankle
- shank
- knee
- socket
- suspension
knee types
- axis
- friction
- extension aid
- stabilizer
axis knee
single or polycentric (4 bar linkage)
friction knee
- constant or variable
- sliding
- pneumatic
- hydralic (provides more friction than pneumatic)
- bionic
stabilizer knee
- manual lock
- friction break (high friction during early stance)
socket types
- *pre-flexed 10 degrees
- quadrilateral (wider M/L)
- ischial containment (wider A/P)
suspension types
- atmospheric
- mechanical
atmospheric suspension
- total suction
- partial suction
mechanical suspension
- silesian bandage or TES belt; hip joint with pelvic belt
