WK2: TR Elbow Components

Question 1

Flexible Hinges ****

Elbow Components

Answer 1

• aligned with elbow exis
• connect harness to socket
• allow forearm pronation and supination
• used with figure of 8 harness and elbow cuff

Question 2

Advantages/Indications

Single Axis Hinge

Answer 2

• protect elbow joint from torque forces (short RL)
• creates longer lever arm for short RL
• support heavy duty axial loading
• prevent hyperextension (mech stop @ 180)

Question 3

Disadvantages

Single Axis Hinge

Answer 3

eliminates forearm pronation and supination

Question 4

Polycentric Hinges

Answer 4

• dual axis
• short residual limb
• prevent cubital bunching
• socket trimlines are left higher

Question 5

Step Up Hinges

Answer 5

• Very short residual limb
• Usually for bilateral involvment
• Forearm will flex twice as much as residual limb (split socket required)

Question 6

Residual Limb Activated Locking Hinges

Answer 6

• very short RL
• limited strength
• split socket design
• residual limb locks/unlocks joints
• cable setup will be same as TH Px