UE prosthetics

Question 1

“very short” transradial amputation

Answer 1

0-35% of amputation remaining

Question 2

“short transradial” amputation

Answer 2

35-55% of amputation remaining

Question 3

measuring intact limb(transradial) =

Answer 3

ulnar styloid to medial humeral epicondyle

Question 4

Measuring the amputation limb (transradial)

Answer 4

medial humeral epicondyle to the bony end of the forearm

Question 5

forearm length is approximately — % of height

Answer 5

14%

Question 6

an adult with a wrist articulation can expect to lift — lbs axially , but with the elbow flexed..

Answer 6

50 or more lbs ; with the elbow flexed the person will tolerate 25 lbs load on the forearm

Question 7

what is the minimum length that is needed in an amputation to conceal a battery and motor

Answer 7

long transradial amputation

Question 8

which transradial amputations will NOT allow for PRO/SUP?

Answer 8

short transradial amputation (because circular in cross section) - must rely on a mechanism within the prosthesis to stimulate forearm motion

Question 9

upper arm length is approximately — % of height

Answer 9

17%

Question 10

in which of the transhumeral amputations can patients transmit shoulder motions to the prosthesis?

Answer 10

in elbow disarticulation (90-100% of humeral length) because the distal end of the limb is oval

Question 11

for a SHORT transhumeral amputation, what design should be prescribed?

Answer 11

a shoulder disarticulation

Question 12

“standard transhumeral” amputation =

Answer 12

50-90% humeral length

Question 13

in humeral neck and/or shoulder disarticulation amputations, contractures of the … are common

Answer 13

glenohumeral and scapulothoracic musculature

Question 14

does VO or VC allow you to hold heavier objects?

Answer 14

VC

Question 15

grasp size of a terminal device =

Answer 15

about 4 inches

Question 16

grasp forces for most terminal devices =

Answer 16

1-50 lbs range, only realy req 7 lbs for daily activites

Question 17

how does a pt with a passive hand open/close the fingers ?

Answer 17

by forearm or shoulder action (each finger has a wire armature so they can bend or straighten the digit with the other hand too)

Question 18

myoelectrically controlled active hands are powered by —- ? their grasp forces are about..

Answer 18

battery powered; grasp forces of about 1-35 lbs

Question 19

which is more expensive – myoelectric or electric swithc-controlled active hands?

Answer 19

myoelectric are more expensive BUT have to wear a harness with the elec switch

Question 20

ideal batteries for both active hands -

Answer 20

lithium ion

Question 21

what is the grasp force produced from a VO cable-controlled hadn?

Answer 21

about 4 lbs (not sufficient for ADLs)

Question 22

how do you size a hook?

Answer 22

same size as the intact thumb (wrist crease to thumb bip)

Question 23

a hook’s max grasp force -

Answer 23

5-8 lbs VO BUT as much as 100 lbs for a VC

Question 24

what object substitues for forearm rotation (to position the terminal device)?

Answer 24

wrist unit

Question 25

what type of wrist unit is suitable for carrying heavy loads?

Answer 25

locking wrist unit (friction unit may rotate under stress)

Question 26

why would polypropylene be chosen as a socket material ?

Answer 26

cooler, easier to modify, BUT less durable

Question 27

IF the pt has socket suspension, the the proximal brim of the socket must..

Answer 27

encase the humeral epicondyles

Question 28

Myoelectric control is achieved by ..

Answer 28

contracting the remnants of the forearm ms (usually the extensors to close/flexors to relax)