Amputation (TF) Flashcards
What kind of knee and foot are usually on the IPOP?
weight activated knee
SACH foot
What kind of prosthesis?
IPOP
What are benefits to IPOP
early WBing and balance
A-P and M-L control in Quad socket
A-P: sits ITs on posterior seat
no M/L control
What gait deviation can occur with no M/L control on the quad socket
Trendelenburg
What kind of socket?
Quad
What is contained in the IRC socket
ischium
pubic ramus
femur
What is the A-P and M-L stability in the IRC?
M-L: bony lock (controls pelvis)
A-P: high anterior/posterior brim
What is the M-L control in sub-ischial socket prevent trendelenburg
vacuum/suction
Sub-Ischial socket
What are the 2 types socket constructions
hard socket or flexible in frame
What are the options for interface?
socks
liner
without socks
What K level will have cadence responsive knee
K3
What muscle is going to control knee?
Glutes
What is an extension assist
in trailing limb position the knee springs out to extend
What K level is a manual locking knee?
K1
Manual locking knee has a ___ hinge and ___ axis
simple
single
manual locking knee __ when upright and __ to sit
locks
unlocks to sit
Manual locking knee:
stance control:
swing mobility:
stance: good its literally locked
swing: none
What kind of knee?
manual locking
Single axis/constant friction knee is what K-level
K1 or 2
Single-axis/constant friction knee has a __ hinge and __ shank speed
simple
specific
more friction in knee =
less friction in knee =
more slower through swing
more fast
What gait problem might happen if there is too much friction?
IC is not timed right, foot hit ground before ready too, tibia is behind you
What is the stance control and swing mobility in single axis knee
stance: none, the knee will be put posterior to weight line creating an extension moment
swing: hip flexion to help get constant friction through swing
Weight-Activated Stance control knee has ___ axis
single
single axis knees have __ stance control
no
how does weight-activated knees have stance control and swing moblity?
stance: WB (no WB you buckle) even if its not straight
swing” extension assist by lifting into hip flexion
What K level is weight-activate stance control
K1 or 2
How does polycentric knee work for stance control and swing mobility
stance: axis moves posterior
swing: axis moves superior and has extension assist
why does the polycentric axis move superior and/or posterior
superior for limb clearance and posterior to create extension moment for stance
What K levels typically have an extension assit?
K1 or 2
What K level is polycentric knee?
K1 or 2
Are any of the K1 or 2 knees cadence responsive?
no
How does the piston design work with a hydraulic or pneumatic knee?
piston moves up and down and resists against air (pneumatic) or water (hydraulic)
What K level is hydraulic/pneumatic knee? is it cadence responsive?
K3
Yes
How is stance control and swing mobility with hydraulic/pneumatic knee?
stance: more resistance against piston pressures down
swing: less resistance allows swing
What are some cons to the hydraulic/pneumatic knee
temperature can change effectiveness (water can freeze making it stiff)
maintenance
A microprocessor knee is what K level? is it cadence responsive?
K3 or 4
yes
how does the microprocessor control stance and swing
computer control piston which works both stance and swing
how does the myoelectric prosthesis work
EMG pads on certain muscles to fire and get motion
What does the rotator do?
torque/turn positions
What are shock absorbers for?
high activity, uneven terrain
What kind of suspension?
TES total elastic suspension
What kind of suspension?
parachute
What is the goal for stairs with a microprocessor knee
step-to going up
step over step going down
If a person has weak glutes how should the single axis knee be adjusted?
more posterior to get more stable extension
what is the relationship between limb length and strength
shorter limb = weaker hip extensors
How is this TKA line effecting the knee joint?
the knee joint is anterior to the TKA line, if it is too far forward, they will buckle
How is the TKA line effecting the knee joint?
the knee joint is posterior to the TKA line so they are more stable
How is the TKA line going to be the most efficient?
if it goes right through the middle of the knee joint
What is bench alignment?
socket 5 degrees of hip flexion
hip adducted for narrow BoS
TKA line based on strength/length of residual limb
What is pistoning? What can cause it?
Socket comes out during swing and pushed back in place during stance.
caused by edema/shrinkage of RL, wrong # of ply
do you want the hip to be extended or flexed during IC/LR? Why?
extended because if it was flexed you can’t use glutes to control knee as well
What kind of pelvic motion is ideal at terminal stance? Why?
forward/anterior rotation to get knee set for swing
If the socket is tilted to neutral or anterior what happens?
extension
What happens if the socket is tilted posterior beyond 10 degrees
buckle?
