CPO Clinical Application & Fitting 2

Question 1

During transtibial prosthetic fitting, a patient reports pistoning of the socket during ambulation. Which adjustment is most appropriate?

Accepted Answer

Increase suspension by adding a pin lock or suction

Answer

Pistoning indicates inadequate suspension, which is corrected by upgrading or adding a pin lock, suction sleeve, or elevated vacuum system.

Question 2

A patient with a transfemoral amputation experiences medial distal thigh pain during the stance phase. The most likely cause is:

Accepted Answer

Insufficient adduction of the socket

Answer

Insufficient adduction leaves the femur in abduction, causing the distal medial femur to bear excess pressure against the socket wall.

Question 3

When fitting a PTB (patellar tendon bearing) socket, which anatomical landmark is considered the primary load-bearing area?

Accepted Answer

Patellar tendon

Answer

The patellar tendon is the primary load-bearing area in a PTB socket due to its pressure tolerance and accessibility.

Question 4

A child with a below-knee limb deficiency is fitted with a prosthesis. The parent asks about growth management. The BEST practice is:

Accepted Answer

Modify the socket with growth pads and schedule regular check-ups

Answer

Children require regular monitoring with modular socket adjustments such as growth pads to accommodate growth without frequent full replacements.

Question 5

Which of the following best describes the function of a SACH (Solid Ankle Cushion Heel) foot?

Accepted Answer

Simulates ankle motion through heel wedge compression

Answer

The SACH foot mimics ankle plantarflexion at heel strike through compression of a cushioned heel wedge, with no true articulation.

(CPO) Certified Prosthetist Orthotist Practice Test