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Orthotic Assistant (CPOA) Practice Exam:
200 Practice Exam Questions & Answers
Study Guide Detailed Explanations (2026
Edition) pdf
1. A patient with a new transtibial prosthesis reports a
"pistoning" sensation. The most likely cause is:
A) Excessive sock ply
B) Insufficient sock ply
C) Too soft a liner
D) Malalignment in flexion
Answer: B
Rationale: Pistoning (vertical movement within the socket) occurs
when the socket is too large, typically due to insufficient sock ply,
reducing suspension and fit. Adding sock ply is the first
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intervention, but persistent pistoning indicates the need for socket
modification or replacement.
2. When assessing a patient for a TLSO following spinal
fusion, which finding would most concern the CPOA?
A) Mild redness over the sternum that fades in 10 minutes
B) Patient report of "pressure" at the iliac crests
C) Non-blanching erythema over a vertebral body
D) Difficulty donning the orthosis independently
Answer: C
Rationale: Non-blanching erythema indicates capillary damage
and impending pressure injury. While transient redness (<20
minutes) is acceptable (Q6), non-blanching redness is a
contraindication to continued wear without modification.
3. A patient with a knee-ankle-foot orthosis (KAFO) and drop
lock asks to be fitted. Before donning, the CPOA must verify:
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A) The patient's insurance authorization is complete
B) The lock mechanism engages fully without play
C) The shoe has a heel height matching the original prescription
D) The patient has read the instruction manual
Answer: B
Rationale: Safety is paramount. A drop lock that fails to fully
engage could cause knee collapse during weight-bearing,
leading to falls. The lock should be tested before each donning.
4. According to ABC Scope of Practice, which task is outside
the CPOA's role?
A) Taking a negative cast of a residual limb
B) Formulating the initial treatment plan independently
C) Educating the patient on donning and doffing
D) Adjusting alignment under indirect supervision
Answer: B
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Rationale: The initial evaluation and formulation of the treatment
plan is the responsibility of the supervising orthotist/prosthetist.
The CPOA participates in implementation but does not
independently develop the treatment plan.
5. A patient with a transtibial amputation presents with a
healed, cylindrical residual limb with minimal soft tissue.
Which weight-bearing area will be MOST critical in prosthetic
fitting?
A) Patellar tendon
B) Fibular head
C) Popliteal fossa
D) Tibial crest
Answer: A
Rationale: In a cylindrical limb without bulbous distal end, the
patellar tendon becomes the primary weight-bearing structure.
The PTB design specifically loads this pressure-tolerant area.
Orthotic Assistant (CPOA) Practice Exam:
200 Practice Exam Questions & Answers
Study Guide Detailed Explanations (2026
Edition) pdf
1. A patient with a new transtibial prosthesis reports a
"pistoning" sensation. The most likely cause is:
A) Excessive sock ply
B) Insufficient sock ply
C) Too soft a liner
D) Malalignment in flexion
Answer: B
Rationale: Pistoning (vertical movement within the socket) occurs
when the socket is too large, typically due to insufficient sock ply,
reducing suspension and fit. Adding sock ply is the first
,Page 2 of 34
intervention, but persistent pistoning indicates the need for socket
modification or replacement.
2. When assessing a patient for a TLSO following spinal
fusion, which finding would most concern the CPOA?
A) Mild redness over the sternum that fades in 10 minutes
B) Patient report of "pressure" at the iliac crests
C) Non-blanching erythema over a vertebral body
D) Difficulty donning the orthosis independently
Answer: C
Rationale: Non-blanching erythema indicates capillary damage
and impending pressure injury. While transient redness (<20
minutes) is acceptable (Q6), non-blanching redness is a
contraindication to continued wear without modification.
3. A patient with a knee-ankle-foot orthosis (KAFO) and drop
lock asks to be fitted. Before donning, the CPOA must verify:
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A) The patient's insurance authorization is complete
B) The lock mechanism engages fully without play
C) The shoe has a heel height matching the original prescription
D) The patient has read the instruction manual
Answer: B
Rationale: Safety is paramount. A drop lock that fails to fully
engage could cause knee collapse during weight-bearing,
leading to falls. The lock should be tested before each donning.
4. According to ABC Scope of Practice, which task is outside
the CPOA's role?
A) Taking a negative cast of a residual limb
B) Formulating the initial treatment plan independently
C) Educating the patient on donning and doffing
D) Adjusting alignment under indirect supervision
Answer: B
, Page 4 of 34
Rationale: The initial evaluation and formulation of the treatment
plan is the responsibility of the supervising orthotist/prosthetist.
The CPOA participates in implementation but does not
independently develop the treatment plan.
5. A patient with a transtibial amputation presents with a
healed, cylindrical residual limb with minimal soft tissue.
Which weight-bearing area will be MOST critical in prosthetic
fitting?
A) Patellar tendon
B) Fibular head
C) Popliteal fossa
D) Tibial crest
Answer: A
Rationale: In a cylindrical limb without bulbous distal end, the
patellar tendon becomes the primary weight-bearing structure.
The PTB design specifically loads this pressure-tolerant area.
