COC Orthotic and Prosthetic Design & Fabrication 3

Question 1

On a positive model for a patellar-tendon-bearing (PTB) socket, which area typically receives a buildup (relief)?

Accepted Answer

Fibular head

Answer

The fibular head is pressure sensitive and is relieved by adding plaster to the positive model.

Question 2

Which area of the transtibial residual limb is considered pressure tolerant?

Accepted Answer

Medial tibial flare

Answer

The medial tibial flare is a broad, load-tolerant surface used for weight bearing.

Question 3

Compared with a quadrilateral socket, an ischial containment transfemoral socket is characterized by:

Accepted Answer

A narrow mediolateral dimension

Answer

IC sockets narrow the ML dimension and enclose the ischium and ramus for femoral control.

Question 4

In a quadrilateral socket, the anterior wall bulge over Scarpa's triangle functions to:

Accepted Answer

Hold the ischium on the posterior seat

Answer

The anterior counterpressure pushes the limb posteriorly to keep the ischial tuberosity on its seat.

Question 5

When casting for a custom AFO in a patient with flexible pes planovalgus, the subtalar joint should generally be held in:

Accepted Answer

Neutral position

Answer

Subtalar neutral captures a corrected, functional foot position in the cast.

COC - Certified Orthotic and Prosthetic Practitioner Practice Test