CPT Prosthetic Fabrication & Assembly Techniques 2

Question 1

Which lamination resin type offers the highest strength-to-weight ratio for prosthetic sockets?

Accepted Answer

Epoxy resin

Answer

Epoxy resin provides the highest strength-to-weight ratio among lamination resins commonly used in prosthetic socket fabrication.

Question 2

During check socket fabrication for a transtibial amputee, the primary purpose of using clear thermoplastic is to:

Accepted Answer

Visualize tissue contact and pressure areas

Answer

Clear thermoplastic check sockets allow the clinician to observe skin blanching, tissue displacement, and contact patterns during fitting.

Question 3

When bench-aligning a SACH foot to a transtibial prosthesis, the foot should be set with:

Accepted Answer

5–7° of toe-out and slight plantar flexion

Answer

A SACH foot is bench-aligned with 5–7° of toe-out to mimic the natural gait angle and slight plantar flexion to encourage heel loading.

Question 4

What is the correct sequence of steps when fabricating a thermoplastic transfemoral socket using direct forming?

Accepted Answer

Heat plastic → drape over cast → trim → add suspension

Answer

The direct forming process begins with heating the thermoplastic sheet, draping it over the positive model, trimming after cooling, then adding suspension components.

Question 5

Which reinforcement fiber orientation provides the greatest resistance to torsional stress in a prosthetic pylon?

Accepted Answer

±45° bias weave

Answer

A ±45° bias weave orientation is most effective at resisting torsional (shear) loads in composite structures like prosthetic pylons.

(CPT) Certified Prosthetic Technician Practice Test

(CPT) Certified Prosthetic Technician Practice Test

CPT Prosthetic Fabrication & Assembly Techniques 2