CPT Prosthetic Components & Technology 3

Question 1

When selecting a prosthetic foot for a K3 (community ambulator) patient, which factor most directly guides the choice between a standard dynamic response foot and a high-activity carbon foot?

Accepted Answer

The patient's functional activity level and anticipated walking speed

Answer

The patient's residual limb length

Answer

The color of the cosmetic cover requested

Answer

The type of socket suspension system used

Question 2

An otto bock-style pyramid adapter (four-hole pyramid) serves what primary purpose in a modular prosthetic system?

Accepted Answer

It allows rotational and angular adjustment between the pylon and foot/knee component

Answer

It provides the suction valve port for suspension

Answer

It connects the socket trim line to the liner

Answer

It houses the hydraulic fluid reservoir

Question 3

In a body-powered transhumeral prosthesis, what is the function of the elbow lock mechanism?

Accepted Answer

It locks the elbow at a selected flexion angle so cable tension can be redirected to operate the terminal device

Answer

It controls terminal device opening and closing

Answer

It provides passive elbow positioning without cable activation

Answer

It regulates hydraulic flow to the elbow joint

Question 4

Which type of prosthetic liner material is generally recommended for patients with sensitive or scarred residual limb skin due to its softer durometer and higher coefficient of friction?

Accepted Answer

Silicone liner

Answer

Rigid thermoplastic liner

Answer

Pelite (polyethylene foam) liner

Answer

Urethane (polyurethane) liner

Question 5

A pylon in an endoskeletal prosthesis provides which structural function?

Accepted Answer

It distributes weight-bearing forces from the socket to the distal prosthetic foot or knee

Answer

It seals the suction socket to prevent air entry

Answer

It stores the battery for a myoelectric system

Answer

It controls the angle of toe break during toe-off

Question 6

What distinguishes a voluntary-closing (VC) terminal device from a voluntary-opening (VO) terminal device in body-powered upper limb prosthetics?

Accepted Answer

VO devices open with cable tension and spring-close at rest; VC devices close with cable tension and spring-open at rest

Answer

VC devices open with cable tension; VO devices close with cable tension and remain open at rest

Answer

VC and VO devices are functionally identical but differ only in cosmetic appearance

Answer

VO devices use myoelectric signals while VC devices use body power

Question 7

When building a transfemoral prosthesis with a modular system, which alignment stage involves adjusting the spatial relationship of the socket to the knee and foot components while the patient stands and walks?

Accepted Answer

Dynamic alignment

Answer

Bench alignment

Answer

Static alignment

Answer

Definitive alignment