UE

Question 1

Difference between figure 8 & 9 harness. When is a figure 9 used instead of a figure 8?

Answer 1

fig 8 has anterior suspensor & is attached to a cuff strap
fig 9 is a cable control system only, no suspension mechanism

Question 2

use of cross back strap

Answer 2

better excursion available
keeps control strap inferior on scapula
less migration
more TD opening is possible

Question 3

inverted y strap

Answer 3

function = transmit vertical forces from cuff to axilla loop
suspension
helps control rotation

Question 4

anterior suspensor strap

Answer 4

function = main suspensor of px
stability against downward pull

location = originating at ring, through deltopectoral groove to junction of inverted y

Question 5

control attachment strap

Answer 5

function = transmit excursion or tension from harness to move cable operate TD

location = origin at ring, passes inferior to spine of scapula & proximal to inferior angle of scapula on amputated side, terminating at hanger cable

Question 6

cross point

Answer 6

function = continue axilla loop to anterior suspensor & control strap

location = to provide the best mechanical advantage the crosspoint should be located just inferior to the spinous process of C7 toward sound side

Question 7

which muscles primary responsibility is for scapular abduction

Answer 7

serrates anterior

Question 8

the retainer is located in the proximal 1/3 of the TR px because

Answer 8

to allow maximum excursion with humeral flexion

Question 9

in the conventional WD px, suspension is provided by the

Answer 9

fig 9 harness

Question 10

in the TR px, the cross bar is located mid-humerus (or up to 1 in distal) in order

Answer 10

to allow full elbow flexion

Question 11

in the long TR px, the typical trim lines are

Answer 11

below the epicondyles to preserve pronation/supination

Question 12

when fabricating the TR px, what measurement should match the lateral epicondyle to thumb tip on the sound side?

Answer 12

supination

Question 13

the polycentric hinge is used for what type of patient?

Answer 13

short TR

Question 14

when fitting the TR px, what measurement should match the lateral epicondyle to thumb tip on the sound side?

Answer 14

the lateral epicondyle to the tip of the TD on the px

Question 15

to fit the triceps cuff, the prosthetist must take circumferential measurements where?

Answer 15

1 in pros. to the cubital fold & around the deltoid insertion

Question 16

the total ROM available in forearm rotation (pronation/supination) is

Answer 16

170*

Question 17

purpose of the fig. 8 harness

Answer 17

suspension & provides reaction point for excursion

Question 18

the TR fig 8 anterior suspensor strap, which runs down to the delta-pectoral groove, is attached to what

Answer 18

the inverted y

Question 19

the self-suspending TR socket suspends in what manner?

Answer 19

ML pressure, assisted by AP pressure

Question 20

the self suspending socket is most commonly prescribed with what type of harness?

Answer 20

fig 9

Question 21

the control attachment strap on the TR harness does what?

Answer 21

activated the TD

Question 22

the step up hinge px is indicated for what type of amputation?

Answer 22

burn patient with limited elbow flexion
very short BE
BE amp where stump disappears into cubital fold

Question 23

in the medium length TR there can be some residual pronation because

Answer 23

pronator teres is still largely intact

Question 24

prime move for elbow flexion

Answer 24

brachialis

Question 25

greatest disadvantage to the amputee using a step up hinge:

Answer 25

loss of flexion power in forearm

Question 26

a component that locks out forearm pron/sup when the TR has less than 50% forearm remaining

Answer 26

rigid hinges

Question 27

in what does the inverted y in a fig 8 harness do?

Answer 27

suspension transmits axial loads to the shoulder attaches to the proximal tabs of the triceps pad

Question 28

the center of the fig 8 harness should be where to produce max excursion?

Answer 28

up to 1 in to the sound side

Question 29

what are the 2 controls in the dual control system of the body powered TH

Answer 29

TD activation, elbow flexion

Question 30

the purpose of the skirting in the shorter AE is what?

Answer 30

control internal/external rotation

Question 31

the location of the AE forearm lift look is moved distally. what will this do the the force and excursion required for elbow flexion?

Answer 31

decrease force & increase excursion

Question 32

elbow lock control is activated through what movement?

Answer 32

humeral extension, abd, and downward rotation of the scap

Question 33

what is the possible cause of external rotation of the AE px during humeral flexion?

Answer 33

humeral retainer too far lateral & lateral suspension strap attach too far posterior.

Question 34

a TH amputee w/ dual control (2 fx, single cable) & a homer 5xa hook. if the measured force at the control strap is 7 lbs. to open the hook & 9 lbs to flex the elbow, what will happen if the amputee attempts to get a piece of candy from a table to his mouth with his px?

Answer 34

the TD will open; he will drop the candy

Question 35

if the TH amputee cannot fully flex the px forearm because of an excursion limitation, they would be aided least by:

Answer 35

moving the elbow flexion attachment (forearm lift loop) distally

Question 36

control system efficiency in UEP is measured at the _________ & the _______.

Answer 36

TD; control strap

Question 37

external movable sheave type excursion amplifier is used with what type of px?

Answer 37

SD

Question 38

what does the nudge control enable the amputee to do?

Answer 38

lock & unlock the elbow by pressing lever w/ the chin

Question 39

an AE amputation w/ 30% humeral length should be fitted with:

Answer 39

an AE px in which the timelines are extended over the scapula & medial to the deltopectoral groove to increase rotational stability

Question 40

the shoulder disarticulation px is operated primarily by what control motion?

Answer 40

scapular abduction

Question 41

one action of the deltoid is to:

Answer 41

adduct the GH joint

Question 42

in order to flex the elbow, the TH amp w/ a fig 8 harness

Answer 42

unlocks the elbow & flexes the GH joint

Question 43

if the application of a single, continuous housing were made on the TH px as it is on the TR, the amputee would lose:

Answer 43

elbow lock control

Question 44

the polycentric (rigid) hinge is used on which type of amputees?

Answer 44

short TR

Question 45

approximately _____ inches of excursion are required to operate a dual control system

Answer 45

4.5

Question 46

when operating a voluntary opening TD close to the body, the TR or TH amputee uses ______ as the source of excursion & force

Answer 46

scapular abduction

Question 47

the correct location of the cross point on a standard TF fig 8 harness is

Answer 47

inferior to CF toward the sound side

Question 48

which muscles primary responsibility is for scapular abduction?

Answer 48

serrates anterior

Question 49

as the elbow flexion attachment is moved distally on a TH px:

Answer 49

increases excursion response

Question 50

a cross back strap is used on a TH px to primarily

Answer 50

increase control cable efficiency

Question 51

which px elbow requires the split control cable?

Answer 51

outside locking hinge, geared step up hinge, stump activated locking hinge

Question 52

which muscle is both a primary elbow flexor & a supinator:

Answer 52

biceps

Question 53

which work together in scapular abduction:

Answer 53

serrates anterior & pectoralis minor

Question 54

in a scapulothoracic amp, what motions can be used to operate the px?

Answer 54

chest expansion

Question 55

which muscle does not internally rotate the humerus?

Answer 55

infraspinatus

Question 56

for which type of amp is external or outside locking joint designed?

Answer 56

elbow disarticulations

Question 57

elevation of the escalation is accomplished by the

Answer 57

trapezius

Question 58

what should function will be lost if the middle section of the deltoid is impaired

Answer 58

abduction

Question 59

a unilateral BE px patient c/o the axilla loop of his harness is uncomfortable. the most common reason for this complaint is that the cross point is:

Answer 59

too close to the amputated side

Question 60

what is not an advantage of the myoelectric px system over a cable driven one?

Answer 60

does not provide inherent sensory feedback

Question 61

the primary advantage of a voluntary closing TD is

Answer 61

graded prehension

Question 62

the main forearm supinator of the forearm is the

Answer 62

biceps

Question 63

an excursion amplifier incorporate on a control system provides increased cable excursion at the expense of

Answer 63

requiring more force

Question 64

when the elbow flexion attachment of the AE forearm is moved toward the TD, it will have what mechanical effect?

Answer 64

increase force required, decrease excursion required