L06. Body Powered Upper Extremity Prostheses

Question 1

What is the largest producer of upper extremity amputations?

Answer 1

Trauma

• ie. fractures, electrical burns, farming, factory mishaps

Question 2

Pronation-supination range _____ (increases/reduces) with shorter residual limb

Answer 2

reduces

Question 3

What is a key performance criteria for an UE prostheses?

Answer 3

Coordinated and simultaneous control of multiple joints

Question 4

What percent of people don’t have a prothesis?

Answer 4

50%

Question 5

What percent of people who do have a prosthesis don’t use it?

Answer 5

50%

Question 6

What are some benefits to a cosmetic restoration option (passive)

Answer 6

1. Light
2. Minimal harnessing
3. Low Maintenance
4. Simple (no control cables)
5. Cosmetic benefit

Question 7

What is a main disadvantage of a cosmetic restoration option?

Answer 7

1. Very low functional gain
2. Decreased durability
3. No active prehension (grabbing of objects)

Question 8

What are some benefits to a body powered prosthesis?

Answer 8

1. Light weight
2. Durable
3. Lower cost
4. Simple controls
5. Increased sensory feedback

Question 9

What are some disadvantages to a body powered prosthesis?

Answer 9

1. Limited grip force
2. Harness can be uncomfortable/restrictive
3. Poor cosmesis
4. Functional envelope (ROM) is limited
5. Possible over-use (neck injury)

Question 10

What are the main options for a terminal device in a body powered prosthesis?

Answer 10

1. Hooks
2. Hands

Question 11

Benefits to hook terminal device

Answer 11

Versatiles, light, durable

• Voluntary opening is most common

Question 12

Benefits to hand terminal device

Answer 12

Cosmetic, sometimes interchangeable, can cover with a glove

• Voluntary opening is most common

Question 13

Voluntary open vs voluntary close

Answer 13

Open: create a motion to open the terminal device

Close: create a motion to close the terminal device