CPT CPT Residual Limb Management & Socket Design 2

Question 1

What is the primary advantage of an elevated vacuum suspension (EVS) system over a standard suction socket?

Accepted Answer

Actively maintains negative pressure to control volume and improve proprioception

Answer

Elevated vacuum suspension actively pumps air from between the liner and socket wall, maintaining consistent negative pressure that controls residual limb volume and enhances sensory feedback.

Question 2

In socket design, what does the term 'relief area' refer to?

Accepted Answer

A region of the socket that is relieved (expanded or softened) to reduce pressure over a bony prominence

Answer

Relief areas are intentional modifications to the socket wall that reduce pressure over bony prominences such as the fibular head or tibial crest to prevent skin breakdown.

Question 3

What residual limb characteristic is most important when selecting the appropriate socket wall thickness during fabrication?

Accepted Answer

Activity level and body weight of the patient

Answer

Socket wall thickness must match the patient's activity level and body weight to ensure structural integrity under load without adding unnecessary weight.

Question 4

Which technique is used to assess the pressure distribution inside a prosthetic socket on a residual limb?

Accepted Answer

Pressure-sensitive film or digital pressure mapping system

Answer

Pressure-sensitive film or digital pressure mapping systems placed between the liner and socket provide objective data on load distribution across the residual limb.

Question 5

A patient with a transtibial amputation reports that the socket feels tight in the morning but loose by the afternoon. What is the most likely explanation?

Accepted Answer

Residual limb volume is larger in the morning due to overnight fluid retention and decreases with activity

Answer

Residual limb volume is typically greatest in the morning due to overnight fluid retention, then decreases with ambulation, causing a tight fit early and a loose fit later in the day.

(CPT) Certified Prosthetic Technician Practice Test

(CPT) Certified Prosthetic Technician Practice Test

CPT CPT Residual Limb Management & Socket Design 2