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
Which prosthetic foot category is designed to store and return energy during the gait cycle, making it most suitable for active ambulators?
Answer: Energy-storing carbon fiber foot
Energy-storing carbon fiber feet (dynamic response feet) flex during loading and release energy at toe-off, benefiting active and athletic users.
What is the primary function of a torsion adapter in a lower-limb prosthesis?
Answer: Allow transverse plane rotation to reduce shear forces on the residual limb
A torsion adapter permits horizontal rotation between the socket and foot, reducing rotational shear forces transmitted to the residual limb during activities like pivoting.
A SACH (Solid Ankle Cushion Heel) foot achieves its shock absorption and pseudo-plantarflexion through which mechanism?
Answer: Compression of a foam or rubber heel wedge
The SACH foot has no mechanical joint; instead, a compressible foam or rubber heel cushion simulates plantarflexion at heel strike.
Which knee unit mechanism uses fluid resistance that automatically adjusts cadence-responsive damping during swing phase?
Answer: Pneumatic or hydraulic cadence-responsive knee
Pneumatic and hydraulic cadence-responsive knee units vary swing-phase resistance in proportion to walking speed, allowing more natural gait at multiple cadences.
A polycentric (four-bar linkage) prosthetic knee provides which key advantage over a single-axis knee?
Answer: Instantaneous center of rotation that moves posteriorly during stance, improving stability
The four-bar linkage geometry shifts the effective center of rotation posteriorly during weight-bearing, creating an inherently more stable stance phase without a mechanical lock.
In upper-limb prosthetics, a body-powered hook terminal device is typically activated by which harness motion?
Answer: Scapular abduction (forward reach) via a figure-8 harness
Scapular abduction generated by forward reach transmits force through the control cable of a figure-8 harness to open the voluntary-opening hook.
Which component is used between a transtibial socket and a prosthetic foot to provide a cosmetically acceptable leg shape while protecting internal components?
Answer: Endoskeletal pylon with foam cover
An endoskeletal pylon covered with a shaped foam cover provides both structural support and cosmetic appearance in a modular transtibial prosthesis.