Rosthetic Written Exam Part 1 AK & BK Prosthetics,
Alignment, Gait, Biomechanics Rehabilitation - Questions with
Correct Answers & Explanations Graded A+ Study Guide.
This written examination assesses advanced clinical and biomechanical competency in above-knee and
below-knee prosthetics, prosthetic alignment, gait analysis, and rehabilitation. It integrates current ISPO
education standards and ABC practice analysis to test application, analysis, and synthesis of prosthetic
principles. It contains 50 multiple-choice questions, each with four distractors and a fully worked rationale that
explains why the keyed answer is correct. Questions are organized into clearly labelled sections that mirror the
major content areas of the course. Targeted learning outcomes include: Analyze and interpret prosthetic gait
deviations using biomechanical principles.; Apply optimal alignment strategies for AK and BK prostheses to
enhance function and comfort.; Synthesize rehabilitation plans integrating prosthetic design, patient assessment,
and evidence-based practice.. Every item has been reviewed for clinical accuracy, current guidelines, and clarity
so that students can study with confidence and self-correct as they work through the bank. Use it as a high-yield
review immediately before the exam, or as a structured practice tool during the unit - the rationales double as
concise teaching notes. The recommended writing time is 3 hours, with a passing score of 75%. Aligned with
Aligned with ISPO Education Standards (2020) and ABC Practice Analysis (2023); meets US university
graduate-level rigor. standards and reflects the question style commonly seen on accredited program
examinations. Students consistently achieving above the cut score on this bank have historically gone on to earn
Section 1: General (Questions 1-50)
1 In a BK prosthesis, excessive socket flexion primarily alters which gait
parameter?
A) Increased knee flexion throughout stance
B) Excessive heel rise in swing
C) Lateral trunk lean toward prosthetic side
D) Early knee extension in terminal swing
Answer: A
Rationale: Excessive socket flexion places the knee in a more flexed position,
leading to increased knee flexion during stance to maintain stability. Heel rise in
swing is related to insufficient knee flexion or prosthetic knee settings, not socket
flexion. Lateral lean is due to abduction alignment, and early extension is from
excessive extension alignment.
2 Which gait deviation in AK amputees results from insufficient prosthetic knee
friction?
A) Excessive heel rise
B) Terminal impact
C) Foot slap
D) Knee buckling
,Answer: B
Rationale: Insufficient knee friction allows the knee to extend too rapidly during
swing, causing terminal impact as the knee snaps into extension. Excessive heel rise
is due to insufficient knee flexion or too much friction. Foot slap is a BK issue, and
knee buckling relates to stance control, not swing friction.
3 During prosthetic alignment, what is the primary effect of moving the socket
anteriorly relative to the foot?
A) Decreased knee flexion moment in stance
B) Increased knee extension moment in stance
C) Increased anterior pelvic tilt
D) Decreased hip extension in terminal stance
Answer: B
Rationale: Anterior socket displacement increases the knee extension moment by
shifting the ground reaction force anterior to the knee, promoting stability. Posterior
displacement would decrease extension moment. Anterior tilt and hip extension are
influenced by other factors like hip flexion contracture or socket flexion angle.
4 In BK prosthetic rehabilitation, which muscle group is most critical for
controlling knee flexion during loading response?
A) Quadriceps
B) Hamstrings
C) Gastrocnemius
D) Hip abductors
Answer: A
Rationale: The quadriceps eccentrically control knee flexion during loading response
to prevent collapse. Hamstrings assist in hip extension but are not primary knee
controllers in stance. Gastrocnemius is absent or transferred in BK amputation, and
hip abductors control pelvis in frontal plane.
5 Which biomechanical principle explains why a dynamic-response foot improves
gait efficiency in BK amputees?
A) It reduces socket pistoning
B) It stores and releases energy during stance
C) It increases knee flexion in swing
D) It decreases hip abductor demand
Answer: B
Rationale: Dynamic-response feet store energy during mid-stance and release it
, during push-off, reducing metabolic cost. Socket pistoning is related to suspension,
not foot type. Knee flexion in swing is controlled by knee unit, and hip abductor
demand is influenced by alignment and pelvis stability.
6 Which of the following best describes the biomechanical advantage of a
quadrilateral socket in AK prosthetics?
A) It provides ischial containment for stability
B) It allows for greater hip abduction range
C) It reduces lateral socket pressure
D) It accommodates hip flexion contracture
Answer: A
Rationale: The quadrilateral socket design features an ischial seat that provides
containment and stability during stance. It does not primarily allow greater
abduction; rather, it limits it. Lateral pressure and flexion contracture management
are better addressed by other designs like ischial containment sockets.
7 A patient with a BK prosthesis exhibits excessive lateral trunk lean toward the
prosthetic side. Which alignment error is most likely?
A) Prosthesis is too short
B) Socket is abducted
C) Foot is excessively toed-out
D) Socket is flexed
Answer: B
Rationale: An abducted socket shifts the base of support laterally, causing the patient
to lean toward the prosthetic side to maintain balance. Prosthesis length affects
vertical stability, toe-out affects transverse plane, and socket flexion affects sagittal
plane.
8 In gait analysis, which parameter is most directly influenced by prosthetic foot
stiffness in BK amputees?
A) Step length
B) Cadence
C) Ankle range of motion
D) Knee flexion moment
Answer: D
Rationale: Foot stiffness affects the external knee flexion moment by altering the
ground reaction force vector and lever arm. Step length and cadence are more related
to overall gait speed and symmetry. Ankle range of motion is determined by foot
Alignment, Gait, Biomechanics Rehabilitation - Questions with
Correct Answers & Explanations Graded A+ Study Guide.
This written examination assesses advanced clinical and biomechanical competency in above-knee and
below-knee prosthetics, prosthetic alignment, gait analysis, and rehabilitation. It integrates current ISPO
education standards and ABC practice analysis to test application, analysis, and synthesis of prosthetic
principles. It contains 50 multiple-choice questions, each with four distractors and a fully worked rationale that
explains why the keyed answer is correct. Questions are organized into clearly labelled sections that mirror the
major content areas of the course. Targeted learning outcomes include: Analyze and interpret prosthetic gait
deviations using biomechanical principles.; Apply optimal alignment strategies for AK and BK prostheses to
enhance function and comfort.; Synthesize rehabilitation plans integrating prosthetic design, patient assessment,
and evidence-based practice.. Every item has been reviewed for clinical accuracy, current guidelines, and clarity
so that students can study with confidence and self-correct as they work through the bank. Use it as a high-yield
review immediately before the exam, or as a structured practice tool during the unit - the rationales double as
concise teaching notes. The recommended writing time is 3 hours, with a passing score of 75%. Aligned with
Aligned with ISPO Education Standards (2020) and ABC Practice Analysis (2023); meets US university
graduate-level rigor. standards and reflects the question style commonly seen on accredited program
examinations. Students consistently achieving above the cut score on this bank have historically gone on to earn
Section 1: General (Questions 1-50)
1 In a BK prosthesis, excessive socket flexion primarily alters which gait
parameter?
A) Increased knee flexion throughout stance
B) Excessive heel rise in swing
C) Lateral trunk lean toward prosthetic side
D) Early knee extension in terminal swing
Answer: A
Rationale: Excessive socket flexion places the knee in a more flexed position,
leading to increased knee flexion during stance to maintain stability. Heel rise in
swing is related to insufficient knee flexion or prosthetic knee settings, not socket
flexion. Lateral lean is due to abduction alignment, and early extension is from
excessive extension alignment.
2 Which gait deviation in AK amputees results from insufficient prosthetic knee
friction?
A) Excessive heel rise
B) Terminal impact
C) Foot slap
D) Knee buckling
,Answer: B
Rationale: Insufficient knee friction allows the knee to extend too rapidly during
swing, causing terminal impact as the knee snaps into extension. Excessive heel rise
is due to insufficient knee flexion or too much friction. Foot slap is a BK issue, and
knee buckling relates to stance control, not swing friction.
3 During prosthetic alignment, what is the primary effect of moving the socket
anteriorly relative to the foot?
A) Decreased knee flexion moment in stance
B) Increased knee extension moment in stance
C) Increased anterior pelvic tilt
D) Decreased hip extension in terminal stance
Answer: B
Rationale: Anterior socket displacement increases the knee extension moment by
shifting the ground reaction force anterior to the knee, promoting stability. Posterior
displacement would decrease extension moment. Anterior tilt and hip extension are
influenced by other factors like hip flexion contracture or socket flexion angle.
4 In BK prosthetic rehabilitation, which muscle group is most critical for
controlling knee flexion during loading response?
A) Quadriceps
B) Hamstrings
C) Gastrocnemius
D) Hip abductors
Answer: A
Rationale: The quadriceps eccentrically control knee flexion during loading response
to prevent collapse. Hamstrings assist in hip extension but are not primary knee
controllers in stance. Gastrocnemius is absent or transferred in BK amputation, and
hip abductors control pelvis in frontal plane.
5 Which biomechanical principle explains why a dynamic-response foot improves
gait efficiency in BK amputees?
A) It reduces socket pistoning
B) It stores and releases energy during stance
C) It increases knee flexion in swing
D) It decreases hip abductor demand
Answer: B
Rationale: Dynamic-response feet store energy during mid-stance and release it
, during push-off, reducing metabolic cost. Socket pistoning is related to suspension,
not foot type. Knee flexion in swing is controlled by knee unit, and hip abductor
demand is influenced by alignment and pelvis stability.
6 Which of the following best describes the biomechanical advantage of a
quadrilateral socket in AK prosthetics?
A) It provides ischial containment for stability
B) It allows for greater hip abduction range
C) It reduces lateral socket pressure
D) It accommodates hip flexion contracture
Answer: A
Rationale: The quadrilateral socket design features an ischial seat that provides
containment and stability during stance. It does not primarily allow greater
abduction; rather, it limits it. Lateral pressure and flexion contracture management
are better addressed by other designs like ischial containment sockets.
7 A patient with a BK prosthesis exhibits excessive lateral trunk lean toward the
prosthetic side. Which alignment error is most likely?
A) Prosthesis is too short
B) Socket is abducted
C) Foot is excessively toed-out
D) Socket is flexed
Answer: B
Rationale: An abducted socket shifts the base of support laterally, causing the patient
to lean toward the prosthetic side to maintain balance. Prosthesis length affects
vertical stability, toe-out affects transverse plane, and socket flexion affects sagittal
plane.
8 In gait analysis, which parameter is most directly influenced by prosthetic foot
stiffness in BK amputees?
A) Step length
B) Cadence
C) Ankle range of motion
D) Knee flexion moment
Answer: D
Rationale: Foot stiffness affects the external knee flexion moment by altering the
ground reaction force vector and lever arm. Step length and cadence are more related
to overall gait speed and symmetry. Ankle range of motion is determined by foot
