Practice Test Geeks(CPT) Certified Prosthetic Technician Practice Test
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Maintenance, Repairs, & Quality Assurance 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 Maintenance, Repairs, & Quality Assurance flashcards as text

  1. A patient with a transtibial prosthesis reports a foul odor from the socket liner after several months of use. The MOST appropriate recommendation is:

    Answer: Replace the liner if odor persists after thorough cleaning per manufacturer guidelines

    If proper cleaning does not eliminate odor, the liner material has likely absorbed microbial contamination and degraded, warranting replacement.

  2. Which measurement is MOST critical to record before and after performing a socket trim-line modification?

    Answer: Socket brim height relative to a fixed anatomical landmark

    Recording brim height relative to a fixed anatomical landmark before and after modification documents the change and provides a reference for reproducibility and future fittings.

  3. During routine maintenance of a microprocessor-controlled knee, the technician finds that the battery charge drops from 100% to 20% in under two hours. The MOST likely cause is:

    Answer: Degraded battery cell capacity requiring battery replacement

    Rapid battery depletion in a microprocessor knee most commonly indicates degraded lithium-ion cell capacity, and battery replacement is the primary indicated action.

  4. A newly fabricated polypropylene check socket warps during storage before the fitting appointment. The MOST likely cause is:

    Answer: Residual internal stress not fully relieved during fabrication cooling

    Polypropylene retains residual internal stresses if cooled too rapidly after forming; these stresses are released over time, causing warping during storage.

  5. When using an abrasive wheel to trim a thermoplastic socket edge, the MOST important technique consideration to prevent material damage is:

    Answer: Using light intermittent passes to prevent heat buildup that can melt or distort the edge

    Thermoplastics melt at relatively low temperatures; light intermittent passes prevent frictional heat accumulation that would melt or distort the trim edge.

  6. A transfemoral prosthesis with a silicone liner and locking pin system fails to lock consistently. After confirming the pin is undamaged, the technician should next inspect:

    Answer: The locking shuttle mechanism inside the socket for debris or wear

    If the pin is intact, inconsistent locking points to debris accumulation or wear in the shuttle lock mechanism inside the socket distal end.

  7. Which ASTM or ISO standard specifically governs structural testing requirements for lower limb prosthetic devices sold in the United States?

    Answer: ISO 10328

    ISO 10328 is the primary international standard specifying structural testing procedures and load levels for lower-limb prostheses, widely adopted in the US market.