UL Prosthetic Standards Flashcards
What is the control system efficiency equation?
Efficiency = (Force at TD)/(Force at Harness)
What is the efficiency (%) standard for a trans radial single control harness?
75-80%
What is the efficiency (%) standard for a transradial dual control harness?
50%
Describe the anterior trimlines for a transradial prosthesis.
- biceps tendon located at the anterior brim when in correct flexion position,
- no more than 50% of arm should be exposed
What is the normal active ROM at the elbow?
0-135 degrees
What is the normal AROM for pronation/supination at the forearm?
85-90 degs for both
What is the elbow flexion ROM goal when using flexible hinges on a transradial prosthesis?
Within 10 degrees of AROM
What is the forearm pronation/supination ROM goal when using flexible hinges on a transradial prosthesis?
Half of the residual ROM
What is the elbow flexion ROM goal when using RIGID hinges on a transradial prosthesis?
Within 10 degrees of AROM
What is the forearm pronation/supination ROM goal when using RIGID hinges on a transradial prosthesis?
Restricted
What is the elbow flexion ROM goal when using a self-suspension transradial prosthesis?
~105-110 degrees of flexion
What is the forearm pronation/supination ROM goal when using a self-suspension transradial prosthesis?
Restricted
What is the standard for rotation of a transradial socket under load testing?
There is to be minimal, if any, rotation of the socket with 3 lbs of force
What is the standard for a transradial socket under axial load testing?
The prosthesis should not slip more than 1 inch and harness should not tear with 50 lbs of axial load
What is the standard for joint axis location for rigid hinges of a transradial prosthesis?
- Joint center located at axis anatomical center
2. Distance from humeral cuff to olecranon is 25 mm
What is the standard for upper limb prosthesis length?
Tip of terminal device matches the thumb tip of contra lateral side
What are the standards for the technical operation of the terminal device of a transradial prosthesis?
Elbow at 90 deg -> 90% opening
TD at waist -> 70% opening
TD at mouth -> 70% opening
What are the 5 standards for the harness of a transradial prosthesis?
- The harness should lay flat on the patient’s body, no edges cutting in.
- The inverted Y splits within 2.5 cm proximal to the pectoralis tendon.
- The anterior suspensor is positioned in the Delto – pectoral groove.
- The Crosspoint is inferior to C7 and 2.5 cm toward the contralateral side.
- The cable should be either always on or always off the patient’s back
How much weight is a patient expected to lift using a transradial prosthesis?
20-30 lbs
How much excursion is needed to operate both TD and elbow of a trans humeral prosthesis with dual control cable?
~4.5”
How much excursion and force is needed to cycle the elbow unit of a transhumeral prosthesis?
1/2” excursion and 1kg Force
What is the initial location of the lift tab?
1 1/4”-1 1/2” distal and 1” anterior to elbow joint center
What is the initial location of the base plate for a transhumeral prosthesis?
25 mm proximal to the distal end of the humerus at postero-lateral aspect of the mid-humerus
What is the standard for ‘force to flex’ the forearm of a trans humeral prosthesis?
Forced to flex forearm from a position of 90° should not exceed 5 kg (10 pounds)
