Rosthetic Written Exam Part 1 AK & BK
Prosthetics 2026/2027 | Alignment, Gait and
Biomechanics Practice Questions with Verified
Answers and Detailed Explanations for
Rehabilitation Certification Success
Prosthetic Written Exam Part 1 — AK & BK Prosthetics 2026/2027
Alignment, Gait and Biomechanics Practice Questions
• This practice exam contains 200 verified multiple-choice questions covering AK
(Above-Knee/Transfemoral) and BK (Below-Knee/Transtibial) prosthetics, with a
focus on alignment, gait analysis, and biomechanics — complete with correct
answers and detailed EXPERT RATIONALE to reinforce clinical reasoning.
• Study tip: Attempt each question independently before revealing the answer, use
the EXPERT RATIONALE to understand the why behind each correct choice, and
revisit any topic where you score below 80% for targeted review.
1. During the stance phase of gait with a transtibial prosthesis, which
alignment feature prevents excessive knee flexion at heel strike?
A. Posterior displacement of the foot
B. Increased plantarflexion of the prosthetic foot
C. Anterior displacement of the socket
D. Setting the heel cushion too soft
E. Anterior displacement of the prosthetic foot relative to the socket
Correct Answer: E. Anterior displacement of the prosthetic foot relative to
the socket
, EXPERT RATIONALE: Placing the foot anteriorly relative to the socket creates a
knee extension moment at heel strike, preventing the knee from collapsing into
excessive flexion and providing stability during early stance.
2. A transfemoral amputee presents with a lateral trunk lean toward the
prosthetic side during stance. What is the most likely cause?
A. Excessive socket adduction
B. Prosthetic foot set too far lateral
C. Short prosthesis or insufficient socket adduction
D. Knee unit set too anterior
E. Weak contralateral hip abductors
Correct Answer: C. Short prosthesis or insufficient socket adduction
EXPERT RATIONALE: Lateral trunk lean (Trendelenburg-like gait) toward the
prosthetic side is typically caused by a prosthesis that is too short or a socket that
lacks adequate adduction, forcing the amputee to lean over the prosthetic limb to
maintain balance.
3. Which of the following best describes the purpose of the alignment process
in prosthetics?
A. To match the cosmetic appearance of the sound limb
B. To reduce the cost of the prosthetic componentry
C. To optimize function, comfort, and energy efficiency during ambulation
D. To ensure the socket fits snugly without pressure relief areas
E. To align the pylon perpendicular to the floor in all planes
Correct Answer: C. To optimize function, comfort, and energy efficiency
during ambulation
, EXPERT RATIONALE: Alignment in prosthetics is a dynamic and static process
aimed at maximizing the patient's functional ability, comfort, and gait efficiency. It
involves positioning components relative to each other and the body to reduce
compensatory movements and metabolic cost.
4. In a transtibial prosthesis, what is the effect of moving the foot anteriorly
during static alignment?
A. Increases plantarflexion moment at the knee
B. Creates a knee extension moment
C. Destabilizes the socket at heel strike
D. Reduces ground reaction force through the limb
E. Increases dorsiflexion of the prosthetic foot
Correct Answer: B. Creates a knee extension moment
EXPERT RATIONALE: When the prosthetic foot is placed anteriorly, the ground
reaction force (GRF) passes anterior to the knee joint axis, producing a knee
extension moment. This is critical for stability in transtibial prosthetic users.
5. Which gait deviation in a transfemoral prosthetic user is characterized by
the prosthetic leg swinging outward in an arc during swing phase?
A. Vaulting
B. Circumduction
C. Hip hiking
D. Lateral trunk lean
E. Steppage gait
Correct Answer: B. Circumduction
, EXPERT RATIONALE: Circumduction occurs when the prosthetic limb swings
outward in a lateral arc during swing phase. It is often caused by a prosthesis that is
too long, excessive socket flexion, or inadequate knee flexion during swing.
6. What is the primary function of the SACH foot in prosthetics?
A. To store and return energy during push-off
B. To allow multiaxial ankle motion
C. To absorb heel strike shock through compression of the heel wedge
D. To replicate anatomical subtalar joint movement
E. To provide dynamic toe break during late stance
Correct Answer: C. To absorb heel strike shock through compression of the
heel wedge
EXPERT RATIONALE: The Solid Ankle Cushion Heel (SACH) foot uses a
compressible heel wedge to simulate plantarflexion at heel strike. It is simple,
durable, and widely used, though it does not provide energy return like dynamic
response feet.
7. A transtibial amputee complains of discomfort at the distal anterior tibia.
What is the most likely prosthetic cause?
A. Socket too loose proximally
B. Insufficient relief at the tibial crest in the socket
C. Foot set too far posterior
D. Liner is too thick
E. Excessive dorsiflexion stop
Correct Answer: B. Insufficient relief at the tibial crest in the socket
Prosthetics 2026/2027 | Alignment, Gait and
Biomechanics Practice Questions with Verified
Answers and Detailed Explanations for
Rehabilitation Certification Success
Prosthetic Written Exam Part 1 — AK & BK Prosthetics 2026/2027
Alignment, Gait and Biomechanics Practice Questions
• This practice exam contains 200 verified multiple-choice questions covering AK
(Above-Knee/Transfemoral) and BK (Below-Knee/Transtibial) prosthetics, with a
focus on alignment, gait analysis, and biomechanics — complete with correct
answers and detailed EXPERT RATIONALE to reinforce clinical reasoning.
• Study tip: Attempt each question independently before revealing the answer, use
the EXPERT RATIONALE to understand the why behind each correct choice, and
revisit any topic where you score below 80% for targeted review.
1. During the stance phase of gait with a transtibial prosthesis, which
alignment feature prevents excessive knee flexion at heel strike?
A. Posterior displacement of the foot
B. Increased plantarflexion of the prosthetic foot
C. Anterior displacement of the socket
D. Setting the heel cushion too soft
E. Anterior displacement of the prosthetic foot relative to the socket
Correct Answer: E. Anterior displacement of the prosthetic foot relative to
the socket
, EXPERT RATIONALE: Placing the foot anteriorly relative to the socket creates a
knee extension moment at heel strike, preventing the knee from collapsing into
excessive flexion and providing stability during early stance.
2. A transfemoral amputee presents with a lateral trunk lean toward the
prosthetic side during stance. What is the most likely cause?
A. Excessive socket adduction
B. Prosthetic foot set too far lateral
C. Short prosthesis or insufficient socket adduction
D. Knee unit set too anterior
E. Weak contralateral hip abductors
Correct Answer: C. Short prosthesis or insufficient socket adduction
EXPERT RATIONALE: Lateral trunk lean (Trendelenburg-like gait) toward the
prosthetic side is typically caused by a prosthesis that is too short or a socket that
lacks adequate adduction, forcing the amputee to lean over the prosthetic limb to
maintain balance.
3. Which of the following best describes the purpose of the alignment process
in prosthetics?
A. To match the cosmetic appearance of the sound limb
B. To reduce the cost of the prosthetic componentry
C. To optimize function, comfort, and energy efficiency during ambulation
D. To ensure the socket fits snugly without pressure relief areas
E. To align the pylon perpendicular to the floor in all planes
Correct Answer: C. To optimize function, comfort, and energy efficiency
during ambulation
, EXPERT RATIONALE: Alignment in prosthetics is a dynamic and static process
aimed at maximizing the patient's functional ability, comfort, and gait efficiency. It
involves positioning components relative to each other and the body to reduce
compensatory movements and metabolic cost.
4. In a transtibial prosthesis, what is the effect of moving the foot anteriorly
during static alignment?
A. Increases plantarflexion moment at the knee
B. Creates a knee extension moment
C. Destabilizes the socket at heel strike
D. Reduces ground reaction force through the limb
E. Increases dorsiflexion of the prosthetic foot
Correct Answer: B. Creates a knee extension moment
EXPERT RATIONALE: When the prosthetic foot is placed anteriorly, the ground
reaction force (GRF) passes anterior to the knee joint axis, producing a knee
extension moment. This is critical for stability in transtibial prosthetic users.
5. Which gait deviation in a transfemoral prosthetic user is characterized by
the prosthetic leg swinging outward in an arc during swing phase?
A. Vaulting
B. Circumduction
C. Hip hiking
D. Lateral trunk lean
E. Steppage gait
Correct Answer: B. Circumduction
, EXPERT RATIONALE: Circumduction occurs when the prosthetic limb swings
outward in a lateral arc during swing phase. It is often caused by a prosthesis that is
too long, excessive socket flexion, or inadequate knee flexion during swing.
6. What is the primary function of the SACH foot in prosthetics?
A. To store and return energy during push-off
B. To allow multiaxial ankle motion
C. To absorb heel strike shock through compression of the heel wedge
D. To replicate anatomical subtalar joint movement
E. To provide dynamic toe break during late stance
Correct Answer: C. To absorb heel strike shock through compression of the
heel wedge
EXPERT RATIONALE: The Solid Ankle Cushion Heel (SACH) foot uses a
compressible heel wedge to simulate plantarflexion at heel strike. It is simple,
durable, and widely used, though it does not provide energy return like dynamic
response feet.
7. A transtibial amputee complains of discomfort at the distal anterior tibia.
What is the most likely prosthetic cause?
A. Socket too loose proximally
B. Insufficient relief at the tibial crest in the socket
C. Foot set too far posterior
D. Liner is too thick
E. Excessive dorsiflexion stop
Correct Answer: B. Insufficient relief at the tibial crest in the socket
