Anatomy, Biomechanics, & Gait Analysis 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 Anatomy, Biomechanics, & Gait Analysis flashcards as text
The ground reaction force (GRF) vector passes posterior to the knee joint during which gait event, creating a knee flexion moment?
Answer: Loading response
During loading response, the GRF vector passes posterior to the knee, creating a flexion moment that the quadriceps must control eccentrically.
Which anatomical plane divides the body into anterior and posterior halves?
Answer: Frontal (coronal) plane
The frontal (coronal) plane divides the body into anterior and posterior sections and is the plane in which abduction and adduction occur.
In a transfemoral prosthesis, 'voluntary control' of the prosthetic knee in a mechanical locking knee occurs through:
Answer: Hip extension at terminal stance unlocking a spring-loaded mechanism
Weight-activated locking knees unlock automatically when the patient extends the hip and unloads the prosthetic limb at terminal stance.
Which muscle is the primary dorsiflexor of the foot and is critical for foot clearance during swing phase?
Answer: Tibialis anterior
The tibialis anterior is the primary dorsiflexor, essential for foot clearance during swing and controlled plantar flexion at initial contact.
Pelvic obliquity during gait, where the pelvis drops on the swing limb side, is compensated by which of the following in a prosthetic user?
Answer: Strengthening the contralateral hip abductors
Strengthening the stance-limb (prosthetic side) hip abductors, or their contralateral counterparts, reduces Trendelenburg-type pelvic drop.
The 'four-bar linkage' knee mechanism in a prosthesis offers which primary biomechanical advantage?
Answer: Creates a polycentric instantaneous center of rotation, improving stability in early stance
The polycentric (four-bar) knee moves its instantaneous center of rotation posteriorly in early stance, increasing inherent stability without full weight.
Which of the following best describes 'step length' in gait analysis?
Answer: The distance from heel strike of one foot to heel strike of the opposite foot
Step length is the linear distance between successive heel strikes of opposite feet, while stride length measures the same foot to same foot.