ABC PROSTHETICS WRITTEN EXAM
2025 QUESTIONS AND ANSWERS
What movements are required to operate a standard trans-radial prosthesis? -
ANS Biscapular abduction and Gleno-humeral flexion
What is the prehension pattern most frequently used by prosthetic hands? - ANS Palmar
What is the proper orientation when taking an impression for all levels of trans-radial
amputation? - ANS Neutral Pro-Supination, 90 degrees
Determine efficiency if a force of 6 lbs is necessary to open the TD fully and 9 lbs are needed at
the hanger - ANS 67% (terminal device force divided by hanger force)
Which muscle acts in the same way a control cable pulls on the thumb of the terminal device? -
ANS Extensor Pollicis Brevis
Polycentric Hinges are used to - ANS Relieve cubital bunching
Which is not a forearm flexor?
- Biceps
1
- Brachialis
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, -Supinator
-Pronator Teres - ANS Supinator
The muscles that comprise the rotator cuff are - ANS Teres minor, supraspinatus,
infraspinatus, subscapularis
What is the main cause of upper extremity amputation? - ANS Trauma
How much can the single axis hinge restrict pronation-supination and still be acceptable for
patient use? - ANS Trick question
Single axis hinge negates pronation-supination
The main advantage of the Wrist Flexion Unit over the Flexion Wrist is - ANS Wrist flexion
unit can rotate in all planes
How many positions does a positive locking hinge have? - ANS 11
The correct location of the cross point on a standard trans-radial figure of eight prosthetic
harness is: - ANS Inferior to C7 toward the sound side
What age is best to fit a child with an upper limb deficiency at birth? - ANS As early as three
months
Which muscle is primarily responsible for scapular abduction? - ANS Serratus Anterior
When would a Krukenberg amputation be recommended? - ANS Blind bilateral trans-radial
patient
2
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@COPYRIGHT @THEBRIGHT 2025/2026
2025 QUESTIONS AND ANSWERS
What movements are required to operate a standard trans-radial prosthesis? -
ANS Biscapular abduction and Gleno-humeral flexion
What is the prehension pattern most frequently used by prosthetic hands? - ANS Palmar
What is the proper orientation when taking an impression for all levels of trans-radial
amputation? - ANS Neutral Pro-Supination, 90 degrees
Determine efficiency if a force of 6 lbs is necessary to open the TD fully and 9 lbs are needed at
the hanger - ANS 67% (terminal device force divided by hanger force)
Which muscle acts in the same way a control cable pulls on the thumb of the terminal device? -
ANS Extensor Pollicis Brevis
Polycentric Hinges are used to - ANS Relieve cubital bunching
Which is not a forearm flexor?
- Biceps
1
- Brachialis
Page
@COPYRIGHT @THEBRIGHT 2025/2026
, -Supinator
-Pronator Teres - ANS Supinator
The muscles that comprise the rotator cuff are - ANS Teres minor, supraspinatus,
infraspinatus, subscapularis
What is the main cause of upper extremity amputation? - ANS Trauma
How much can the single axis hinge restrict pronation-supination and still be acceptable for
patient use? - ANS Trick question
Single axis hinge negates pronation-supination
The main advantage of the Wrist Flexion Unit over the Flexion Wrist is - ANS Wrist flexion
unit can rotate in all planes
How many positions does a positive locking hinge have? - ANS 11
The correct location of the cross point on a standard trans-radial figure of eight prosthetic
harness is: - ANS Inferior to C7 toward the sound side
What age is best to fit a child with an upper limb deficiency at birth? - ANS As early as three
months
Which muscle is primarily responsible for scapular abduction? - ANS Serratus Anterior
When would a Krukenberg amputation be recommended? - ANS Blind bilateral trans-radial
patient
2
Page
@COPYRIGHT @THEBRIGHT 2025/2026
