Page 1 of 147
Prosthetic-Orthotic Assistant (CPOA)
Practice Exam: 200 Practice Exam
Questions & Answers Study Guide
Detailed Explanations (2026 Edition) pdf
Q1. Which muscle is the primary knee extensor?
A) Biceps femoris
B) Semitendinosus
C) Rectus femoris
D) Gastrocnemius
Answer: C
Rationale: The rectus femoris is part of the quadriceps group,
responsible for knee extension. The biceps femoris and
semitendinosus are knee flexors.
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Q2. The normal range of motion for ankle dorsiflexion is
approximately:
A) 0-5°
B) 10-20°
C) 30-40°
D) 45-55°
Answer: B
Rationale: Normal active dorsiflexion is 10-20° with the knee
flexed. Greater than 20° may indicate ligamentous laxity.
Q3. Which bone articulates with the acetabulum?
A) Tibia
B) Fibula
C) Femur
D) Patella
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Answer: C
Rationale: The femoral head articulates with the acetabulum of
the pelvis to form the hip joint.
Q4. The primary action of the gluteus medius is:
A) Hip flexion
B) Hip abduction
C) Hip adduction
D) Hip extension
Answer: B
Rationale: Gluteus medius abducts the thigh and stabilizes the
pelvis during gait. Weakness results in a Trendelenburg sign.
Q5. Which nerve innervates the tibialis anterior?
, Page 4 of 147
A) Superficial peroneal
B) Deep peroneal
C) Tibial
D) Sural
Answer: B
Rationale: The deep peroneal nerve (L4-S1) innervates the
anterior compartment muscles, including the tibialis anterior which
controls dorsiflexion.
Q6. The sciatic nerve is composed of which two nerves?
A) Femoral and obturator
B) Tibial and common peroneal
C) Superior and inferior gluteal
D) Pudendal and posterior femoral cutaneous
Answer: B
Prosthetic-Orthotic Assistant (CPOA)
Practice Exam: 200 Practice Exam
Questions & Answers Study Guide
Detailed Explanations (2026 Edition) pdf
Q1. Which muscle is the primary knee extensor?
A) Biceps femoris
B) Semitendinosus
C) Rectus femoris
D) Gastrocnemius
Answer: C
Rationale: The rectus femoris is part of the quadriceps group,
responsible for knee extension. The biceps femoris and
semitendinosus are knee flexors.
,Page 2 of 147
Q2. The normal range of motion for ankle dorsiflexion is
approximately:
A) 0-5°
B) 10-20°
C) 30-40°
D) 45-55°
Answer: B
Rationale: Normal active dorsiflexion is 10-20° with the knee
flexed. Greater than 20° may indicate ligamentous laxity.
Q3. Which bone articulates with the acetabulum?
A) Tibia
B) Fibula
C) Femur
D) Patella
,Page 3 of 147
Answer: C
Rationale: The femoral head articulates with the acetabulum of
the pelvis to form the hip joint.
Q4. The primary action of the gluteus medius is:
A) Hip flexion
B) Hip abduction
C) Hip adduction
D) Hip extension
Answer: B
Rationale: Gluteus medius abducts the thigh and stabilizes the
pelvis during gait. Weakness results in a Trendelenburg sign.
Q5. Which nerve innervates the tibialis anterior?
, Page 4 of 147
A) Superficial peroneal
B) Deep peroneal
C) Tibial
D) Sural
Answer: B
Rationale: The deep peroneal nerve (L4-S1) innervates the
anterior compartment muscles, including the tibialis anterior which
controls dorsiflexion.
Q6. The sciatic nerve is composed of which two nerves?
A) Femoral and obturator
B) Tibial and common peroneal
C) Superior and inferior gluteal
D) Pudendal and posterior femoral cutaneous
Answer: B
