Upper Px Practice Exam Flashcards
To determine the control system efficiency of an UEP:
Divide the force measured at the hanger by the force at the terminal device.
An axial pull test on an UEP should be:
A force of about 50lbs and should not displace the socket more than 1 inch
When the arm is over head, the trapezius muscle:
Positions the glenoid cavity downwards
Primary mover in glenohumeral extension
Deltoid, infraspinatus, latissimus Doris, tree major, triceps brachii
Glenohumeral horizontal flexion is of:
Deltoid, pectoralis major
Rhomboids originate on
Thoracic vertebrae and insert along the scapula from the root of the spine to the inferior angle
External rotation of the humerus is accomplished with:
Infraspinatus and teres minor
Internal rotation of humerus is by:
Subscapularis, teres major, pec major
Triceps actions:
Extends elbow, extends the glenohumeral joint
In the medium length BE there can be some residual pronation because:
Pronation teres is still largely intact
The amount of humeral flexion to fully flex the elbow of an AE prosthesis should not exceed
45 degrees
SD operates primarily by what motion
Scapula abduction
If AE amputee is having difficulties in flexing elbow of px what can help?
Add a cross back strap to the harness
Move the forearm lift loop distally,
Replace steel hook with aluminum one
The lever type excursion ampulifier provides increased excursion at expense of:
Force
Initial socket brim for a short AE amputation would be trimmed on a line
One-two incessant above the acromion
A non-prehensile activity may be illustrated by holding a
Suitcase
When fitting a socket for a VSBE (very short?) the mechanical elbow should flex to:
135 degrees
External movable sheave type excursion ampulifier is used with what type of prosthesis
SD
When making a plaster wrap for a VSBE split socket or muenster, the elbow is flexed
90 degrees
What is chief advantage of using the housing cross bar assembly
Reduces control cable bending, increase cable life
The major limitation that is incurred by the SD amputee is
Excursion to operate px
When using the single pivot hinge, the center of the joint is placed 1/2” above the medial superior brim of the socket, T/F?
False- _______
WE-500 and WA-600 are what type wrist units
Friction
The brachioradialis assists in elbow flexion, T/F?
True
Triple control means?
One cable for elbow flexion, one for TD operation and 3rd for elbow locking
The E-400 elbow is set in 5-10degrees of initial elbow flexion, T/F?
True
The FM wrist disconnnect is not recommended for use on:
SD and bilateral UEP
Polycentric hinge is used on which type of amputee
Short BE
ACROMION is part of
Scapula
The acceptable range of glenohumeral flexion for AE px is:
135 degrees
In what position should the muscle tunnel be when assembling the control system of the biceps cineplasty?
At max shortening
When the elbow is flexed to 90 the forearm can be rotated through an arc by humeral rotation.the size of this arc is?
110degrees
Proximal posterior border of the VSBE socket is shaped to contain the ole crayon process, as a result:
Elbow can not fully extend
Th terminal device most desirable for use with cineplasty amputees is
Voluntary closing
In SD what muscle groups are suitable for myoelectric elbow control
Pectoralis major, and trapezius
Internal rotation of humerus
Subscapularis, pec major, latissimus dorsi
Th most prominent and highest point on the shoulder girdle is the
Acromion
The elbow is flexed to 90 and a 40 lb weight is held in hand. The distance from the elbow axis to the weight is 15 in. How much force must the elbow flexors exert if their insertion is 2” from the elbow joint
300in/lbs
Characteristics of shoulder saddle harness
Increases comfort in axial loading
Reduces pressure in axilla
Presents cosmetic difficulties for females
Frantic & Aitkin’s classification system, complete absence of the upper limb distal to the shoulder joint is termed
Amelia
Characteristics of the cross back strap
Increases available cable excursion
Decreases force required to operate the TD
Tends to keep the cross point from migrating
(Does not make donning and doffing more difficult)
Which of the following epiphyses contributes most to longitudinal growth of the upper limb
Proximal humerus
Elevation of scapula:
Trapezius
In short AE px the trim lines are extended proximally
Increase rotational stability
The AE prosthesis is designed with 10-15 degrees of elbow flexion in order to
Give more cosmetic appearance
What of the following modifications would not increase function for a bileral short AE amputee:
Use a wrist flexion unit of the dominant side
Lower the elbow center to decrease the forearm length
Decrease the size of the proximal wing on the socket
Line the cable housing with teflon
Decrease the size of the proximal wing on the socket
In the munenster socket the principal function of the posterior proximal brim is to limit elbow extension and
Provide suspension in axial loading
