Elbow Units for TR

Question 1

Flexible Hinge

Answer 1

• allows active use of forearm pronation and supination
• can be made from using metal cable, leather and dacron webbing
• for WD, Long TR, and trans-carpal amps

Question 2

Rigid Hinge

Answer 2

• protects residual limb against torque during Px use.

- for mid forearm and above amps

Question 3

single axis hinge

Answer 3

• provide axial stability between socket and residual limb

- for short TR amps

Question 4

polycentric hinge

Answer 4

• reduces muscle bunching during elbow flexion

- for short and very short TR amps

Question 5

step-up hinge

Answer 5

• amplifies the excursion of the anatomical elbow 2:1
• Two types: sliding (split housing cable) and geared (bowden cable)
• for very short TR

Question 6

residual limb-activated locking hinge

Answer 6

• The split socket design is used so limb can lock and unlock the mechanical elbow joint.
• for very short TR or patients that can’t operate conventional Px