Prosthetic Fabrication & Assembly Techniques 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 Fabrication & Assembly Techniques flashcards as text
In a transtibial prosthesis, excessive anterior tilt of the socket (increased flexion) during fabrication will most directly cause:
Answer: Increased toe loading in early stance and reduced heel contact
Excessive anterior socket tilt pitches the residual limb forward, reducing heel strike loading and increasing forefoot pressure early in the stance phase.
Which method is used to verify the structural integrity of a finished laminated prosthetic socket before patient use?
Answer: Proof load testing to 3× the expected body weight
Proof load testing at a multiple of the patient's body weight verifies that the socket can safely withstand functional loads without failure.
During upper extremity prosthesis fabrication, the figure-8 harness attachment point at the axilla loop should be positioned to:
Answer: Allow full humeral flexion without excessive migration
Correct axilla loop placement allows unrestricted humeral flexion while keeping the harness stable and preventing migration during terminal device operation.
When heat gun forming a thermoplastic socket trim line, overheating at the brim edge most commonly results in:
Answer: Stress whitening, warping, and weakened material at the brim
Overheating thermoplastic at the trim line causes stress whitening, material warping, and reduced mechanical strength at the brim edge.
The purpose of adding proximal relief areas (reliefs) for bony prominences such as the fibular head during socket fabrication is to:
Answer: Reduce pressure concentration over sensitive bony areas
Relief areas reduce localized pressure over bony prominences to prevent skin breakdown, numbness, and discomfort at vulnerable anatomical sites.
A modular endoskeletal prosthesis is being assembled and the technician notes that the rotation alignment between the pylon and the foot is 10° internally rotated. The correct corrective action is to:
Answer: Loosen the rotation lock collar, adjust to neutral, and re-tighten to torque spec
Endoskeletal systems include rotation lock collars that allow angular adjustment without component replacement; re-torquing to specification secures the corrected position.
When fabricating a prosthetic foam cosmetic cover for a transfemoral prosthesis, the distal end shaping should replicate the:
Answer: Contralateral limb's ankle and foot anatomy
The cosmetic cover is carved to match the contralateral limb's anatomy including ankle and foot dimensions for symmetrical appearance.