CPO Prosthetic & Orthotic Design & Fabrication 3

Question 1

In the fabrication of a patellar tendon bearing (PTB) transtibial socket, the area over the fibular head should be:

Accepted Answer

Relieved to avoid peroneal nerve compression

Answer

The fibular head area must be relieved in the PTB socket to prevent compression of the superficial peroneal nerve and subsequent neuropathy.

Question 2

Which joint design in a knee-ankle-foot orthosis (KAFO) allows for free motion during swing phase while providing stance-phase stability?

Accepted Answer

Stance control (SCKAFO) orthotic knee joint

Answer

Stance control KAFO joints automatically lock during weight acceptance and unlock during swing to allow free knee flexion and improve gait efficiency.

Question 3

The primary advantage of using a flexible inner socket within a rigid outer frame (flexible socket design) for transfemoral amputees is:

Accepted Answer

Improved comfort and tissue accommodation during dynamic activity

Answer

The flexible inner socket (typically polyethylene) conforms to soft tissue changes during activity, improving comfort and reducing pressure peaks.

Question 4

When fabricating a TLSO for scoliosis management, the three-point pressure system primarily works by applying corrective force at the:

Accepted Answer

Apex of the curve and two counter-pressure points above and below

Answer

The three-point system applies a primary corrective force at the curve apex with reciprocal counter-forces above and below to produce lateral correction.

Question 5

What is the correct sequence for laminating a carbon fiber prosthetic socket using wet lay-up technique?

Accepted Answer

Apply resin to fabric layers, lay over positive model, apply vacuum, cure

Answer

Wet lay-up involves saturating reinforcement fabric with resin, draping it over the model, applying vacuum for consolidation, and then allowing cure.

(CPO) Certified Prosthetist Orthotist Practice Test

(CPO) Certified Prosthetist Orthotist Practice Test

CPO Prosthetic & Orthotic Design & Fabrication 3