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BOARDS: Functional Training, Equipment, and Technologies > Prosthetics > Flashcards

Flashcards in Prosthetics Deck (32)
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1
Q

What is a Syme’s disarticulation?

A

ankle disarticulation

- heel pad preserved and attached to end of tibia for WB

2
Q

Can you weight bear through disarticulations?

A

yes

3
Q

T/F: Selective loading is made in a prosthetic socket through build ups on tendon-bearing areas.

A

true

- relief for bony prominences, nerves, tendons

4
Q

What is the terminal device in a lower-extremity prosthetic?

A

the foot (terminal end that interacts with environment)

5
Q

What motions does a SACH foot limit?

A

limits sagittal plane motion, specifically PF

- allows small ML motion, transverse motion

6
Q

For a similar foot to the SACH foot but for a more active individual, what would you prescribe?

A

a SAFE foot: solid ankle flexible endoskeleton

- allows more nonsagittal plan motions

7
Q

What motions does a single-axis foot allow?

A

sagittal plane motion, with stops

8
Q

Where are sensitive pressure areas of a transtibial amputee?

A

anterior tibial crest
anterior tibia
fibular head and neck
fibular nerve

9
Q

What are areas that can tolerate pressure in a trans-tibal amputee?

A

patellar tendon
medial tibial plateau
tibial/fibular shafts

10
Q

Which type of friction would an older adult who is mostly sedentary need for their knee prosthetic?

A
constant friction
(vs variable friction, used for varying speeds for more active individuals)
11
Q

If the knee center is set too far forward from the TKA line, what will happen at the knee?

A

knee will be unstable and buckle

12
Q

What does a friction brake in the knee do?

A

increases friction at midstance to prevent knee flexion, but allows smooth knee motions through rest of gait cycle

13
Q

What is an extension aid in a prosthetic limb?

A

external elastic strap or internal coiled sprong that assists with TKE during late swing

14
Q

Where is pressure directed in an above-knee prosthetic?

A

ischial tuberosity
gluteals
lateral sides of residual limb
distal end (can be sensitive though)

15
Q

Why would a patient demonstrate bending towards the prosthetic side during gait?

A
  • shorter prosthetic limb
  • hip pain
  • weak abductors
  • low lateral wall, high medial wall
16
Q

T/F: A long prosthesis may result in an abducted stance.

A

true

17
Q

T/F: A socket being too big might cause a patient to vault on the other side to bring the prosthetic limb forward.

A

false: socket to small can cause vaulting, not too big

18
Q

What might cause excessive lumbar lordosis during stance with a prosthetic?

A
  • painful ischial WB
  • hip flexion contracture
  • weak hip extensors or abs
  • insufficient support from anterior or posterior walls
  • inadequate socket flexion
19
Q

Why might the knee lock into TKE during terminal swing with a prosthetic?

A
  • pt fearful so excessively hip flexes limb
  • insufficient knee friction
  • too much tension in knee extension aid
20
Q

Why might there be a heel whip with a prosthetic limb during swing?

A

excessive rotation in prosthetic
knee bolt rotated
foot malaligned

21
Q

T/F: A patient who favors the sound limb and limits weight bearing time on the prosthetic limb with demonstrate decreased step length on the prosthetic side.

A

False, shorter step length on sound side since they won’t stay long on the prosthetic limb in stance

22
Q

With a medial thrust in midstance for a TTA, what could potentially be wrong with the prosthesis?

A

laterally placed foot

23
Q

T/F: A socket being set too far backward can cause premature knee flexion in stance.

A

false, socket too far forward = premature knee flexion

24
Q

T/F: If the socket for a TTA is aligned to far backward or tilted posteriorly, this can result in inadequate knee flexion.

A

true

25
Q

A patient reports that they feel like they’re walking uphill with their prosthetic limb. What could be happening?

A

socket set too far back/lacks sufficient flexion
DF bumper is too stiff causing excess PF
prosthetic foot keel too long

26
Q

An unstable knee unit will result in what gait deviation?

A

forward flexion during stance

27
Q

Inadequate socket flexion will result in what gait deviation?

A

excessive lordosis during stance

28
Q

What prosthetic causes can result in a circumducted gait?

A
long prosthesis
locked knee unit
loose knee friction
inadequate socket suspension
small/loose socket
PF'ed foot
29
Q

With a plantar flexion bumper being too soft, what gait deviation can occur?

A

foot slap

- can also occur if heel cushion is too soft`

30
Q

What could cause a lateral thrust in mid stance from a prosthetic?

A

foot inset too medially

31
Q

What can cause premature knee flexion in late stance?

A

DF bumper too soft
socket set too far forward/excessively flexed
prosthetic foot keel too short
KF contracture

32
Q

Painful ischial weightbearing in a TFA prosthetic can result in what deviation?

A

excessive lordosis