Transfemoral Components

Question 1

(Prosthetic) Knee stability is:

Answer 1

The ability of the prosthetic knee to remain extended and fully supportive during the stance phase of walking.

Question 2

Knee classifications are divided into (4) types:

Answer 2

1. Axes
2. Friction
3. Braking or Locking Mechanisms
4. Microprocessor control

Question 3

Types of knee axes (2):

Answer 3

1. Single axis

2. Polycentric axis

Question 4

Types of knee friction (3):

Answer 4

1. Mechanical
2. Pneumatic
3. Hydraulic

Question 5

Braking or locking unit example in a mechanical friction knee:

Answer 5

Stance control knee

Question 6

Microprocessor control knee:

Answer 6

– Sense whether knee flexion or extension moment is occurring and the knee position that is present

– On board computer adjusts knee resistance to accommodate a range of gait speeds

Question 7

Microprocessor Knee (Advantages and Disadvantages:

Answer 7

Advantages:

• • Wide range of gait speeds
• • Energy saving

Disadvantages:

• • Cost
• • Weight
• • Unknown durability

Question 8

Transfemoral Socket types (2):

Answer 8

1. Quadrilateral

2. Ischial Containment socket

Question 9

Transfemoral Suspension Types (4 most common):

Answer 9

1. Suction suspension
   a. traditional
   b. roll-on silicone liner
2. Hypobaric
3. Soft Belts
   a. Total Elastic Suspension (TES)
   b. Silesian Bandage
4. Pelvic Belt

Question 10

Torsion Adapter Unit function:

Answer 10

Absorbs ground reaction force to minimize friction between the socket and the residual limb.

– Allows for up to 20 degrees of rotation
– Advantageous for golfers, or individuals with skin
breakdown