CPT Prosthetic Fitting & Alignment Flashcards
6 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 6 CPT Prosthetic Fitting & Alignment flashcards as text
What is the purpose of a flexible inner socket (FIS) design in prosthetics?
Answer: To allow dynamic accommodation of residual limb volume changes during activity
A flexible inner socket accommodates minor volume fluctuations of the residual limb during activity while a rigid outer frame maintains structural integrity.
During prosthetic fitting, 'pistoning' is evaluated by observing which movement?
Answer: Vertical displacement between the socket and residual limb during gait
Pistoning is the undesired vertical up-and-down movement of the residual limb relative to the socket, evaluated clinically during ambulation.
What is the functional significance of setting appropriate initial flexion in a transtibial socket?
Answer: Promotes smooth knee flexion and quadriceps activation during loading
Initial socket flexion in a transtibial prosthesis facilitates loading response mechanics and activates residual limb musculature appropriately during gait.
A transtibial prosthetic user reports redness and skin breakdown at the distal end of the residual limb. This most likely indicates which fitting problem?
Answer: Inadequate total contact — distal end bearing too much concentrated load
Distal end skin breakdown typically results from inadequate total contact, causing the residual limb to drop into the socket and concentrate load on the distal tip.
Which fitting principle describes trimming the transtibial socket's posterior wall height to avoid impinging the popliteal fossa during knee flexion?
Answer: Popliteal relief trim line
The posterior trim line of a transtibial socket must clear the popliteal fossa to prevent impingement and allow full knee flexion without discomfort.
When performing a final fit check before delivering a prosthesis, which inspection is performed while the patient stands with eyes closed?
Answer: Balance and proprioceptive stability assessment
Having the patient stand with eyes closed tests balance and proprioceptive stability without visual compensation, revealing any fit or alignment issues that affect sensory feedback.