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Prosthetics & Orthotics Boards Prep > UL Prosthetic Standards > Flashcards

UL Prosthetic Standards Flashcards

1
Q

What is the control system efficiency equation?

A

Efficiency = (Force at TD)/(Force at Harness)

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2
Q

What is the efficiency (%) standard for a trans radial single control harness?

A

75-80%

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3
Q

What is the efficiency (%) standard for a transradial dual control harness?

A

50%

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4
Q

Describe the anterior trimlines for a transradial prosthesis.

A
  • biceps tendon located at the anterior brim when in correct flexion position,
  • no more than 50% of arm should be exposed
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5
Q

What is the normal active ROM at the elbow?

A

0-135 degrees

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6
Q

What is the normal AROM for pronation/supination at the forearm?

A

85-90 degs for both

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7
Q

What is the elbow flexion ROM goal when using flexible hinges on a transradial prosthesis?

A

Within 10 degrees of AROM

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8
Q

What is the forearm pronation/supination ROM goal when using flexible hinges on a transradial prosthesis?

A

Half of the residual ROM

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9
Q

What is the elbow flexion ROM goal when using RIGID hinges on a transradial prosthesis?

A

Within 10 degrees of AROM

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10
Q

What is the forearm pronation/supination ROM goal when using RIGID hinges on a transradial prosthesis?

A

Restricted

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11
Q

What is the elbow flexion ROM goal when using a self-suspension transradial prosthesis?

A

~105-110 degrees of flexion

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12
Q

What is the forearm pronation/supination ROM goal when using a self-suspension transradial prosthesis?

A

Restricted

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13
Q

What is the standard for rotation of a transradial socket under load testing?

A

There is to be minimal, if any, rotation of the socket with 3 lbs of force

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14
Q

What is the standard for a transradial socket under axial load testing?

A

The prosthesis should not slip more than 1 inch and harness should not tear with 50 lbs of axial load

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15
Q

What is the standard for joint axis location for rigid hinges of a transradial prosthesis?

A
  1. Joint center located at axis anatomical center

2. Distance from humeral cuff to olecranon is 25 mm

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16
Q

What is the standard for upper limb prosthesis length?

A

Tip of terminal device matches the thumb tip of contra lateral side

17
Q

What are the standards for the technical operation of the terminal device of a transradial prosthesis?

A

Elbow at 90 deg -> 90% opening
TD at waist -> 70% opening
TD at mouth -> 70% opening

18
Q

What are the 5 standards for the harness of a transradial prosthesis?

A
  1. The harness should lay flat on the patient’s body, no edges cutting in.
  2. The inverted Y splits within 2.5 cm proximal to the pectoralis tendon.
  3. The anterior suspensor is positioned in the Delto – pectoral groove.
  4. The Crosspoint is inferior to C7 and 2.5 cm toward the contralateral side.
  5. The cable should be either always on or always off the patient’s back
19
Q

How much weight is a patient expected to lift using a transradial prosthesis?

A

20-30 lbs

20
Q

How much excursion is needed to operate both TD and elbow of a trans humeral prosthesis with dual control cable?

A

~4.5”

21
Q

How much excursion and force is needed to cycle the elbow unit of a transhumeral prosthesis?

A

1/2” excursion and 1kg Force

22
Q

What is the initial location of the lift tab?

A

1 1/4”-1 1/2” distal and 1” anterior to elbow joint center

23
Q

What is the initial location of the base plate for a transhumeral prosthesis?

A

25 mm proximal to the distal end of the humerus at postero-lateral aspect of the mid-humerus

24
Q

What is the standard for ‘force to flex’ the forearm of a trans humeral prosthesis?

A

Forced to flex forearm from a position of 90° should not exceed 5 kg (10 pounds)

25
Q

What are 10 solutions to an excursion/unable to open TD at mouth problem?

A
  1. Tighten CAS
  2. Check triple swivel. Is distal end of cable housing hitting triple swivel?
  3. Move EFA proximally (this will also incr the force needed)
  4. Move baseplate posterior and distal
  5. Add cross back strap
  6. ‘Z’ modification (great for short TH)
  7. Expanded cross point (lowers CAS)
  8. Dual ring harness (lowers CAS)
  9. Baja piece
  10. Check socket fit
26
Q

What are 10 solutions to a force problem of a transhumeral prosthesis?

A
  1. Check number of rubber bands.
  2. Move elbow flexion attachment (EFA) distally.
  3. Move baseplate anterior and proximally.
  4. Add spring lift assist (be sure to move EFA to most proximal location).
  5. Add second retainer to redirect cable.
  6. ERGO arm: spring lift assist on whole arm.
  7. Shorten forearm.
  8. Lighter TD
  9. Teflon/spectra lining (reduces friction).
  10. Check fairlead for contact.

Prosthetics & Orthotics Boards Prep (12 decks)

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