CPT Treatment Protocols & Procedures 3

Question 1

A certified prosthetic technician is laminating a transfemoral socket using a pull-through technique. What is the correct order of lamination layers from innermost to outermost?

Accepted Answer

Nylon stockinette, reinforcement layers, nylon stockinette

Answer

The standard pull-through lamination sequence uses a nylon stockinette as the innermost layer, followed by reinforcement layers (fiberglass/carbon), and a final outer nylon stockinette.

Question 2

When mixing acrylic lamination resin, what ratio of hardener to base resin is most commonly used?

Accepted Answer

1:10 by weight

Answer

Acrylic lamination resins typically use a 1:10 hardener-to-base ratio by weight, though technicians must always follow the manufacturer's specific instructions.

Question 3

A patient's prosthetic foot exhibits excessive medial whip during swing phase. Which modification would BEST correct this problem?

Accepted Answer

Rotate the foot externally in the pylon

Answer

Medial whip is caused by internal rotation of the prosthetic foot; rotating the foot externally in the pylon corrects the whip by neutralizing the rotational alignment.

Question 4

During gait analysis, a transfemoral prosthesis user demonstrates a lateral trunk lean toward the prosthetic side. Which alignment change should be tried first?

Accepted Answer

Adduct the prosthetic hip socket

Answer

Adducting the hip socket reduces the required lateral lean by bringing the mechanical axis of the prosthesis closer to the body's center of gravity.

Question 5

What is the purpose of the relief built into a transtibial socket at the fibular head?

Accepted Answer

To prevent pressure on a bony prominence and protect the peroneal nerve

Answer

The fibular head relief reduces direct pressure on this bony prominence and protects the superficial peroneal nerve from compression that could cause pain or neurological symptoms.

(CPT) Certified Prosthetic Technician Practice Test

(CPT) Certified Prosthetic Technician Practice Test

CPT Treatment Protocols & Procedures 3