Prosthetic Components & Technology Flashcards
7 cards from real CPT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Prosthetic Components & Technology flashcards as text
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?
Answer: The patient's functional activity level and anticipated walking speed
Foot selection is primarily driven by the patient's functional level (K-level) and activity demands, as higher-activity feet are designed to optimize performance at faster cadences.
An otto bock-style pyramid adapter (four-hole pyramid) serves what primary purpose in a modular prosthetic system?
Answer: It allows rotational and angular adjustment between the pylon and foot/knee component
A pyramid adapter provides a standardized interface with adjustable alignment capability between the pylon and distal components, enabling fine-tuning of foot/knee orientation.
In a body-powered transhumeral prosthesis, what is the function of the elbow lock mechanism?
Answer: It locks the elbow at a selected flexion angle so cable tension can be redirected to operate the terminal device
Engaging the elbow lock holds the elbow at the desired flexion angle, allowing the same control cable to be used for terminal device operation rather than elbow flexion.
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?
Answer: Silicone liner
Silicone liners have a low durometer (soft), conform closely to skin contours, and provide cushioning and friction for sensitive or fragile residual limb skin.
A pylon in an endoskeletal prosthesis provides which structural function?
Answer: It distributes weight-bearing forces from the socket to the distal prosthetic foot or knee
The pylon is the structural load-bearing tube that transfers axial and bending forces from the socket down to the prosthetic foot or knee component.
What distinguishes a voluntary-closing (VC) terminal device from a voluntary-opening (VO) terminal device in body-powered upper limb prosthetics?
Answer: VO devices open with cable tension and spring-close at rest; VC devices close with cable tension and spring-open at rest
Voluntary-opening (VO) devices use cable tension to open against a spring that maintains closure at rest, while voluntary-closing (VC) devices use cable tension to grip and spring-open when relaxed, providing more natural grip force proportional to effort.
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?
Answer: Dynamic alignment
Dynamic alignment is performed while the patient ambulates, allowing the prosthetist and technician to observe gait deviations and adjust component positioning for optimal function.