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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.

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  1. Which lamination resin type offers the highest strength-to-weight ratio for prosthetic sockets?

    Answer: Epoxy resin

    Epoxy resin provides the highest strength-to-weight ratio among lamination resins commonly used in prosthetic socket fabrication.

  2. During check socket fabrication for a transtibial amputee, the primary purpose of using clear thermoplastic is to:

    Answer: Visualize tissue contact and pressure areas

    Clear thermoplastic check sockets allow the clinician to observe skin blanching, tissue displacement, and contact patterns during fitting.

  3. When bench-aligning a SACH foot to a transtibial prosthesis, the foot should be set with:

    Answer: 5–7° of toe-out and slight plantar flexion

    A SACH foot is bench-aligned with 5–7° of toe-out to mimic the natural gait angle and slight plantar flexion to encourage heel loading.

  4. What is the correct sequence of steps when fabricating a thermoplastic transfemoral socket using direct forming?

    Answer: Heat plastic → drape over cast → trim → add suspension

    The direct forming process begins with heating the thermoplastic sheet, draping it over the positive model, trimming after cooling, then adding suspension components.

  5. Which reinforcement fiber orientation provides the greatest resistance to torsional stress in a prosthetic pylon?

    Answer: ±45° bias weave

    A ±45° bias weave orientation is most effective at resisting torsional (shear) loads in composite structures like prosthetic pylons.

  6. When using a pull-through lamination technique, the stockinette layers are arranged so that:

    Answer: Innermost nylon is pulled through last after all reinforcement layers

    In pull-through lamination, the inner nylon stockinette is pulled through the carbon and fiberglass layers last to create a smooth inner socket surface.

  7. To achieve proper pistoning control in a pin-lock suspension system, the technician must ensure:

    Answer: The liner pin length matches the distal socket receiver depth

    Proper fit requires the liner's pin length to match the receiver depth so the lock engages securely without bottoming out or incomplete engagement.