ABC Prosthetics Written Exam With Verified Answers

What movements are required to operate a standard trans-radial prosthesis? - Answer Biscapular abduction and Gleno-humeral flexion What is the prehension pattern most frequently used by prosthetic hands? - Answer Palmar What is the proper orientation when taking an impression for all levels of trans-radial amputation? - Answer 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 - Answer 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? - Answer Extensor Pollicis Brevis Polycentric Hinges are used to - Answer Relieve cubital bunching Which is not a forearm flexor? - Biceps - Brachialis -Supinator -Pronator Teres - Answer Supinator The muscles that comprise the rotator cuff are - Answer Teres minor, supraspinatus, infraspinatus, subscapularis What is the main cause of upper extremity amputation? - Answer Trauma How much can the single axis hinge restrict pronation-supination and still be acceptable for patient use? - Answer Trick question Single axis hinge negates pronation-supination The main advantage of the Wrist Flexion Unit over the Flexion Wrist is - Answer Wrist flexion unit can rotate in all planes How many positions does a positive locking hinge have? - Answer 11 The correct location of the cross point on a standard trans-radial figure of eight prosthetic harness is: - Answer Inferior to C7 toward the sound side What age is best to fit a child with an upper limb deficiency at birth? - Answer As early as three months Which muscle is primarily responsible for scapular abduction? - Answer Serratus Anterior When would a Krukenberg amputation be recommended? - Answer Blind bilateral trans-radial patient Upper Limb Supracondylar Suspension - Answer - Is frequently used with external power prostheses - May restrict elbow flexion - Frequently uses figure of 9 harnessing with body powered prostheses Split housing cable is required when using - Answer Body powered elbow hinges Oven curing is required if the flexible resin content is greater than: - Answer 20% The use of step-up hinges: - Answer Increases the patient's functional range of motion Polycentric Hinges - Answer Help lessen cubital fold bunching Elbow flexors - Answer - Brachialis - Biceps Brachii - Anconeous APRL Hook - Answer - Voluntary Closing - Lyre shaped fingers - Self locking feature - Two finger opening sizes Features of the ulna - Answer - Trochlear notch - Coronoid process - Olecranon Serratus Anterior and Pectoralis Minor - Answer Work rogether in scapular abduction Biceps muscle - Answer Is both a primary elbow flexor and supinator