CPT Prosthetic Fabrication & Assembly Techniques 3

Question 1

Which vacuum level range is recommended during diagnostic socket lamination to ensure adequate resin infusion without voids?

Accepted Answer

25–29 inHg

Answer

A vacuum level of 25–29 inHg (near atmospheric) ensures thorough resin wet-out and void-free lamination in prosthetic socket fabrication.

Question 2

A transfemoral socket exhibits a medial brim that is too high, likely causing:

Accepted Answer

Perineal pressure and adductor roll

Answer

An overly high medial brim creates pressure against the perineum and adductor tissue, commonly called adductor roll.

Question 3

When grinding the inner surface of a laminated socket to relieve a pressure area, the technician should use:

Accepted Answer

A drum sander at low speed with light pressure

Answer

A drum sander at low speed with light pressure allows controlled, gradual material removal without burning or delaminating the composite layers.

Question 4

The primary function of a flexible inner socket (FIS) combined with a rigid frame is to:

Accepted Answer

Allow soft-tissue displacement while maintaining structural integrity

Answer

A flexible inner socket allows the residual limb tissues to expand and displace naturally, while the rigid outer frame maintains alignment and structural support.

Question 5

During exoskeletal (crustacean) prosthesis fabrication, the wood block carving for the thigh section must be shaped to accommodate:

Accepted Answer

Structural load transfer along the medial and lateral walls

Answer

The carved wood shank of an exoskeletal prosthesis must distribute structural loads along the medial and lateral walls to maintain integrity during ambulation.

(CPT) Certified Prosthetic Technician Practice Test

(CPT) Certified Prosthetic Technician Practice Test

CPT Prosthetic Fabrication & Assembly Techniques 3