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O&P Board Prep > UE Prosthetics > Flashcards

UE Prosthetics Flashcards

1
Q

What age is appropriate to begin fitting UE prostheses?

A

“Sit to fit”

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2
Q

What is an advantage of canted-style TD?

A

Improved line of sight

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3
Q

What is an advangtage of lyre shaped TDs?

A

Improved cylindrical grasp/ability to hold round objects

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4
Q

What is the most common prehension pattern for mechanical hand TDs?

A

Palmar

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5
Q

Describe the single axis hinge

A

Eliminates pronation/supination

Offers a HD option

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6
Q

Describe flexible hinges - when are the essential?

A

Allows for pronation/supination
Offers a HD option
Necessary to bilateral fittings

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7
Q

When are outside locking hinges most appropriate? How many positions are available for locking?

A

Elbow disarticulation

7 locking positions; 5 in the HD version

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8
Q

What is an advantage of a polycentric hinge?

A

Reduced cubital bunching

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9
Q

When are stump activated hinges indicated?

A

Very short below elbow

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10
Q

How many locking positions are available with stump activated hinges?

A

Five

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11
Q

Which hings requires use of a split housing cable?

A

Stump activated hinge

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12
Q

When are step up hinges indicated?

A

Very short below elbow

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13
Q

What is the benefit and trade-off associated with step-up hinges?

A

Improved ROM; however, increased force is required

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14
Q

What hinge is indicated for a brachial plexus injury?

A

Flail arm hinge

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15
Q

What is on the medial side of the flail arm hinge? What is on the lateral side?

A

Lock - medial side

Spring - lateral side

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16
Q

How many locking positions does a large mechanical elbow have?

A

11 ( 8 HD )

17
Q

How many locking positions does a medium mechanical elbow have?

A

11 ( 9 HD )

18
Q

How many locking positions does a child-sized mechanical elbow have?

A

10 (no HD option)

19
Q

Name three types of shoulder units

A

Abduction joint
Flexion abduction joint
Universal shoulder design

20
Q

Optimal cross point in Figure 8 harnessing

A

Slightly inferior to C7, biased toward the sound side

21
Q

What is the main suspension strap in a TR Figure of 8 harness?

A

Anterior suspension strap

22
Q

What is the function of the anterior suspension strap in the transhumeral harness?

A

Unlock the elbow

23
Q

What is the main suspension strap in TH harnessing?

A

Lateral suspension strap

24
Q

What is the force/excursion requirement for the TD? Elbow? Lock

A

TD: 2”, 15 lbs.
Elbow: 2.5”, 9 lbs.
Lock: 0.75”, 3 lbs.

25
Q

List two control issues which indicate more power is required.

A

Forearm doesn’t go up, TD opens with flexion

26
Q

How could you correct an issue you determine requires more power?

A

Move the elbow flexion attachment point distal
Move the baseplate and retainer anterior and proximal
Use a lighter TD
Shorten the forearm
Lubricate the cable

27
Q

List two control issues which indicate greater excursion is required.

A

TD not fully opening, TD doesn’t open at the mouth

28
Q

How could you correct an issue you determine requires greater excursion?

A

Move the elbow flexion attachment point more proximal
Move the baseplate and retainer posterior and distal
Tighten the control strap
Cut a rubberband
Add a spring lift assist

29
Q

What is the required efficiency for a TR prosthesis?

A

70%

30
Q

What is the required efficiency for a TH prosthesis?

A

50%

31
Q

What is the required maintained pronation-supination for a TR prosthesis? What is the required flexion?

A

50% pronation supination

Full flexion

32
Q

What is the maximum glenohumeral flexion required to lift the TH?

A

45 deg.

33
Q

What is axilla discomfort in a TR most likely attributed to?

A

Crosspoint is too close to the sound side

34
Q

What is the initial preflexion for an elbow in a TH system?

A

10-15 deg.

35
Q

Why is the elbow preflexed in a transhumeral system?

A

Improved mechanical advantage when initiating forearm flexion

36
Q

What muscles are simulated with activation of a voluntary opening TD?

A

Extensor digitorum communis and the lumbricals

O&P Board Prep (6 decks)

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