Transfemoral Socket Design

Question 1

socket types

Answer 1

ischial containment

others

Question 2

other socket types

Answer 2

MAS design

QIC hybrid

Sub ischial

I-FIT

Socketless socket

Question 3

general principles

Answer 3

pressure

socket/material characteristics

quadrilateral socket

ischial containment socket

Question 4

pressure –> sockets are

Answer 4

total contact

Question 5

pressure –> sockets are not

Answer 5

distal end bearing

Question 6

pressure –> there is sme

Answer 6

minimal pressure on distal end

Question 7

socket/material characteristics –> could be

Answer 7

rigid vs flexible

Question 8

socket/material characteristics –> will be

Answer 8

total contact

Question 9

socket/material characteristics –> the flexible socket will be in a

Answer 9

rigid frame

Question 10

socket/material characteristics –> what is more comfortable

Answer 10

flexible brim

Question 11

socket/material characteristics –> has

Answer 11

ease of fabrication

new advances in materials

Question 12

quadrilateral socket –> had been

Answer 12

standard for many years

Question 13

quadrilateral socket –> % of what is fabricated today

Answer 13

very small

Question 14

quadrilateral socket –> when might we see it

Answer 14

if individual has had limb loss for a long time

Question 15

quadrilateral socket –> designed changed from

Answer 15

plug fit

Question 16

quadrilateral socket –> originally developed

Answer 16

1950s

Question 17

ischial containment socket –> is..

Answer 17

much of what is fabricated

Question 18

ischial containment socket –> types

Answer 18

CAT - CAM

CAD - CAM

Question 19

ischial containment socket –> CAT-CAM

Answer 19

contour adducted trochanteric controlled alignment method

Question 20

ischial containment socket –> CAD-CAM

Answer 20

computer aided design

Question 21

ischial containment socket design

Answer 21

basis for design

Question 22

insufficiencies w/ quad socket –> ischial containment socket design

Answer 22

iscial tubs

glutes

Question 23

insufficiencies w/ quad socket (ischial tubs) –> ischial containment socket design

Answer 23

ischial tub sits outside of socket on seat and is free to shift around in M/L and A/P planes

Question 24

insufficiencies w/ quad socket (glutes) –> ischial containment socket design

Answer 24

glute med contracts

proximal residual limb slides medially on ischial seat

distal femur = pressure

Question 25

problems w/ quad socket --> ischial containment socket design

Answer 25

shift of residual limb in socket feeling that IT did not or could not WB pressure in Scarpa's triangle shift of IT posterior

Question 26

problems w/ quad socket --> ischial containment socket design --> shift of residual limb in socket

Answer 26

results in lateral trunk leaning to relieve medial and lateral socket pressures get the COG over the base of support

Question 27

problems w/ quad socket --> ischial containment socket design --> feeling that IT did not or could not WB

Answer 27

for more weight sharing by soft tissues

Question 28

problems w/ quad socket --> ischial containment socket design --> pressure in scarpa's triangle

Answer 28

may compromise circulation to residual limb decrease blood to mm

Question 29

problems w/ quad socket --> ischial containment socket design --> shift of IT posteriorly

Answer 29

at HS can decrease A/P stability

Question 30

ischial containment socket design --> shape

Answer 30

narrow M/L opens up A/P opposite of quad socket

Question 31

ischial containment socket design --> forces acting on RL

Answer 31

lateral directed force on ramus and IT medially directed force on femur (proximal/distal femur)

Question 32

ischial containment socket design --> fxn of forces

Answer 32

3 pt pressure system locks RL/pelvis in place

Question 33

advantages of ischial containment socket design

Answer 33

results of bony look increases efficiency of gait flexible brim

Question 34

advantages --> results of bony lock (1)

Answer 34

maintenance of normal femoral adduction angulation decrease tendency for socket to shift laterally at midstance required counter force applied to femur to resist femoral abduction

Question 35

advantages --> results of bony lock (2)

Answer 35

by preventing femoral ABD --> we eliminate/lessen lateral trunk leaning keeps ABD at fxnal length and with femur ADD, BOS is more normal and displacement of CG decreases

Question 36

advantages --> flexible brim

Answer 36

extra space in perineal space increase circulation to RL allows thigh to deform naturally during sitting thigh can more easily change contour dynamically during gait less proximal brim pain from rigid socket

Question 37

MAS

Answer 37

marlo anatomical socket FDR center for prosthetics and orthotics

Question 38

characteristics of MAS

Answer 38

lower AP wall more room for hip mm to operate no WB on gluteal mm more cosmetic appearance

Question 39

Quad-IC socket is used w/

Answer 39

vacuum or linear system

Question 40

QIC is the

Answer 40

most comfortable/versatile socket

Question 41

Osteointegration

Answer 41

direct structural and fxnal connection b/w living bone and the surface of a load-bearing artificial implant

Question 42

what do OI prosthesis represent

Answer 42

promising development in the rehab of individuals w/ TF amputation increase QOL