Exam (elaborations)
Upper limb prosthetics Questions with Accurate Answers
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Upper limb prosthetics
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Upper limb prostheticsAll of the following are indications for single pivot hinges EXCEPT - answer allows for
minimal pronation and supination
If a force of 9 lbs. is necessary to open the hook fingers at the terminal
device and 13 lbs. is required at the hanger. The control system efficiency
would be: - answer69%
A client is operating a standard body-powered prosthesis and notices the
TD opens when he pronates the TD. This is most likely caused by: - answer Cable too
short
In order to allow for pronation and supination, a prosthesis must be designed to -
answer exclude the humeral epicondyles
A trans-radial prosthesis using single pivot hinges is assessed as meeting the
recognized standards if it has no more than _______ degrees less elbow flexion range
than normal - answer10 degrees
#3,6, and 7 hooks all have what feature(s) in common - answer voluntary opening
When fitting a bilateral, short, trans-radial patient who has limited elbow flexion range of
motion bilaterally, the most appropriate prosthesis design would incorporate: -
answergeared step-up hinges
The wrist units which allow for flexion to be available to patients are mostly indicated for
- answerbilateral transradial levels
One advantage of a voluntary closing terminal device is: - answerit allows for graded
prehension
In order for the transradial patient to operate a terminal device, which combination of
body control motions are utilized? - answerBiscapular abduction and humeral flexion
A trans-radial patient will feel pressure on his limb when lifting an object with his
prosthesis on the - answerproximal ulna and distal radius
The main difference between the 5XA and the 555 terminal device is: - answershape; #
5 is canted, 555 lyre shaped
, The main function of the inverted "Y" strap in a standard figure of eight trans-radial
harness is - answerdistribute forces to humeral cuff from axial loads
The amount of cable travel necessary to fully open a 5XA terminal device is - answer2
inches
If the cross point of a figure of eight harness is positioned too superior, what effect will
that have on the controll attachment strap(CAS)? - answerthe CAS will be too superior
on the scapula
Dual control fair-lead - answerproximal housing at the elbow, distal housing, anterior
side one cable, lateral side the other cable
Why must transhumeral amputation levels have intimate socket fittings? - answerThe
more proximal the less excursion used (excursion > length and ROM
4.5" of cable to move the TD and the elbow - answerit takes more excursion the more
proximal the amputation
Elbow flexion attachment: - answer1. upper limb amputees have strength by the
shoulder joint rarely have to move the EFA more distal
2. the lever arm( short residual limb) more distal the heavier the components, placement
has an effect on the prosthesis function
3. MORE PROXIMAL = MORE FORCE & LESS EXCURSION (used for shorter limb
length, FA is longer, heavier TD)
4. MORE DISTAL = LESS FORCE & MORE EXCURSION (ROM & distance, easier to
lift the elbow)
The starting point of the EFA - answer1. 25 mm anterior to the elbow axis; 30 mm distal
to the elbow axis; 12 mm cable house extending beyond elbow; 3rd hole distal
Proximal Base Plate: - answercan never be placed more distal than the cut end of the
humerus
1. Short limb move proximal base plate - answer1. PROXIMAL, CAS moves
SUPERIOR, less body motion, LESS EXCURSION
2. Longer limb move proximal base plate - answer2. POSTERIOR & DISTAL,GAIN
excursion -> lose force, cable is closer to the elbow axis, CAS moves more INFERIOR
creates more ROM
Proximal base plate - answer3. The more LATERAL & PROXIMAL move the cable
anterior to the elbow it is easier to lift the arm (GAIN more force lose excursion)
DISADVANTAGE CAS is more SUPERIOR on the scapula less ROM
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