CPT Maintenance, Repairs, & Quality Assurance 3

Question 1

Which type of corrosion is MOST commonly observed at the interface between an aluminum pylon and a stainless steel component in a prosthetic system?

Accepted Answer

Galvanic corrosion

Answer

Galvanic corrosion occurs when two dissimilar metals (aluminum and stainless steel) are in electrical contact in the presence of moisture, accelerating oxidation of the less noble metal.

Question 2

When performing a static structural test on a transtibial prosthesis, the load is applied at what angle to simulate worst-case forefoot loading?

Accepted Answer

15° anterior from vertical

Answer

ISO 10328 structural testing applies loads at approximately 15° anterior to simulate the forefoot loading vector encountered during terminal stance.

Question 3

A technician is repairing a cracked thermoplastic socket. After spot-heating and reshaping the crack area, the MOST important final quality step is:

Accepted Answer

Checking wall thickness with calipers at the repaired site

Answer

After any thermal repair to a thermoplastic socket, wall thickness must be verified because reheating can thin the material and compromise structural integrity.

Question 4

A hydraulic ankle-foot prosthetic component requires fluid replacement. The technician's PRIMARY reference for fluid type and volume should be:

Accepted Answer

Manufacturer's service manual for that specific component

Answer

Only the manufacturer's service manual contains exact fluid type, viscosity, and fill volume specifications validated for that specific hydraulic component.

Question 5

Which condition MOST directly indicates that a prosthetic liner requires replacement rather than continued use?

Accepted Answer

Visible pinhole perforations in the liner wall

Answer

Pinhole perforations break the sealed interface required for suspension, making the liner functionally unsafe and necessitating immediate replacement.

(CPT) Certified Prosthetic Technician Practice Test

(CPT) Certified Prosthetic Technician Practice Test

CPT Maintenance, Repairs, & Quality Assurance 3