CPT CPT Prosthetic Fitting & Alignment 2

Question 1

What is 'check socket' used for in the prosthetic fitting process?

Accepted Answer

To verify fit and alignment before fabricating the definitive socket

Answer

A check socket (test socket) is a transparent or temporary socket used to assess fit, comfort, and alignment prior to fabricating the permanent definitive socket.

Question 2

Which gait deviation is most commonly associated with a transtibial socket that is fit too loose?

Accepted Answer

Pistoning during swing phase

Answer

A loose socket causes pistoning—vertical movement of the limb within the socket during swing phase—reducing control and comfort.

Question 3

What does a 'total contact socket' design aim to achieve in lower-limb prosthetics?

Accepted Answer

Distribute pressure evenly across the entire residual limb surface

Answer

Total contact socket design ensures the entire residual limb surface shares load evenly, reducing peak pressure points and improving patient comfort.

Question 4

When a prosthetist requests the technician to add a heel wedge to a SACH foot, what alignment adjustment does this typically create?

Accepted Answer

Increased plantar flexion moment at heel strike

Answer

Adding a heel wedge compresses the heel cushion more, effectively increasing the plantar flexion moment at heel strike to assist knee stability.

Question 5

In a transfemoral prosthesis, excessive lateral trunk bending toward the prosthetic side during stance is most likely caused by which alignment fault?

Accepted Answer

Socket positioned too far medially or abduction angle set incorrectly

Answer

Lateral trunk bending toward the prosthetic side indicates the socket is shifted medially or the hip abductor leverage is insufficient, often related to socket abduction angle.

(CPT) Certified Prosthetic Technician Practice Test

(CPT) Certified Prosthetic Technician Practice Test

CPT CPT Prosthetic Fitting & Alignment 2