The CPO credential is awarded by the American Board for Certification in Orthotics, Prosthetics & Pedorthics to candidates with an O&P degree and NCOPE residency. This page sets out the exam format and policies as ABC publishes them, then gives you free practice sets by topic, worked questions and a study plan. Our questions are written with AI tools and are not real exam items.

CPO Exam at a Glance

What changed for CPO in 2026

• Oct 25, 2026: Eligibility changed to 18+, O&P degree, NCOPE residency (previously 18+, CAAHEP-accredited O&P master's (or WES-evaluated equivalent), NCOPE residency (18 months dual) for simulation/CPM).^[3]
• Oct 25, 2026: Registration deadline changed to December 1, 2026 (Feb 2027 written; Feb–Mar 2027 CPM) (previously December 1, 2026 (Feb 2027 written/simulation and Feb–Mar 2027 CPM cycles)).^[4]
• Oct 25, 2026: Score release (Clinical Patient Management (CPM) Exam) changed to Preliminary pass/fail within 1 week (previously Preliminary pass/fail within 1 week; score report ~2 weeks).^[2]
• Oct 25, 2026: Retake policy changed to 3 years or 4 attempts; from Jan 1, 2027 max 2 windows/8 attempts, then remediation (previously 3 years or 4 attempts per eligibility; from Jan 1, 2027 max 2 windows/8 attempts, then remediation).^[2]

What the CPO is and how it works

According to American Board for Certification in Orthotics, Prosthetics & Pedorthics, “The three and one half hour, 200 question, multiple choice exam assesses your knowledge of patient management.”^[1]

The CPO credential is issued by the American Board for Certification in Orthotics, Prosthetics & Pedorthics (ABC) to practitioners who work in both prosthetics and orthotics. To be eligible you must be 18 or older, hold an O&P degree and have completed an NCOPE residency. Check the eligibility page on the ABC site for the full requirements before you apply.

The Prosthetist Orthotist Written Exam has 200 multiple-choice questions. The Simulation Exam is interactive: the dual-discipline version runs 4 hours with 9 simulated cases, and the single-discipline version runs 3 hours with 7 simulated cases. Written and Simulation exams are taken at a test center or online with a live remote proctor. The Clinical Patient Management (CPM) hands-on exam is in person at the ABC Testing Center in Tampa, FL.

Results arrive by email. CPM candidates get a preliminary pass/fail result within 1 week, and Simulation candidates get an official score report within 2 weeks.

Once your application is approved you have 3 years or 4 attempts. From Jan 1, 2027 the limit becomes a maximum of 2 windows or 8 attempts, followed by remediation. The registration deadline is December 1, 2026 for the Feb 2027 written exam and the Feb-Mar 2027 CPM. Late applications are accepted for up to 14 days after the deadline with a $100 late fee. Certification runs on a 5-year cycle, with a $330 annual renewal due December 1. Fees and dates can change, so confirm them with ABC.

Worked examples: how to reason through CPO questions

These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.

Example 1

Question: Which aspect of the patient's lifestyle is important to evaluate?

1. Preferred shoe style
2. Daily activities and mobility requirements
3. Patient's sleep schedule
4. Income level

Answer: B. Daily activities and mobility requirements

Explanation:

The correct answer is daily activities and mobility requirements. A device has to match what the person actually does: walking distances, standing for long periods, work tasks, sport. Those demands drive component choice, design and the follow-up plan.

Preferred shoe style may matter for fit or acceptance, but it does not set the functional demands on the device. Sleep schedule is mostly irrelevant to device selection unless a specific night-use orthosis is being considered, which this question does not describe. Income level can affect funding and access, but it is not a lifestyle factor that shapes the clinical design.

Rule to remember: when a question asks what to evaluate about a patient's lifestyle, choose the answer that describes function and activity, because that is what the device must support.

Example 2

Question: Which orthotic alignment principle ensures the knee joint center is positioned anterior to the ground reaction force vector during stance to promote stability?

1. Dynamic alignment
2. Passive knee stability through GRF anterior to joint
3. Active quadriceps recruitment
4. Posterior socket trim lines

Answer: B. Passive knee stability through GRF anterior to joint

Explanation:

The correct answer is passive knee stability through the ground reaction force (GRF) falling anterior to the joint. When the GRF line passes in front of the knee center during stance, it creates an extension moment that holds the knee straight without muscle effort. That is the principle behind stance-phase stability in many knee designs and alignments.

Dynamic alignment describes adjusting alignment while the patient walks, not the specific force relationship in the question. Active quadriceps recruitment is the opposite idea, because it relies on muscle effort instead of alignment. Posterior socket trim lines concern socket shape and comfort, and do not set the GRF position relative to the knee.

Rule to remember: GRF in front of the knee gives an extension moment and passive stability, while GRF behind it tends to flex the knee.

Example 3

Question: What does cadence refer to in clinical gait analysis?

1. Distance covered per step
2. Number of steps taken per unit time
3. Speed of swing phase
4. Ratio of stance to swing time

Answer: B. Number of steps taken per unit time

Explanation:

The correct answer is the number of steps taken per unit time. Cadence is a temporal gait parameter, usually reported as steps per minute, and it is one of the simplest measures to take in clinic.

Distance covered per step is step length, a spatial parameter. Speed of swing phase is a timing or velocity measure of one part of the cycle and is not cadence. Ratio of stance to swing time describes how the gait cycle is divided, which is a phase relationship and not a rate of stepping.

Rule to remember: sort gait terms into spatial (step length, stride length, width), temporal (cadence, stance and swing durations) and combined (walking speed). Cadence is always a count over time.

How to use these practice tests

Start with the official ABC pages for eligibility, exams and fees and dates, and note which exam formats you still have to take. The written exam, the Simulation Exam and the CPM hands-on exam test different skills, so your practice should differ for each.

Take a first pass through each of our practice sets without notes, starting with Patient Evaluation, Clinical Application & Fitting and Biomechanics & Gait Analysis. Mark every miss and write one line on why the correct option is right. Then work through Design & Fabrication, Materials Science and Patient Management & Follow-Up.

• Use Documentation, Coding & Reimbursement, Ethics & Legal Compliance and Quality Assurance for the practice-management side.
• Retry only the questions you missed after a gap of a few days, so you test recall and not recognition.
• For the Simulation Exam, talk through a case aloud: evaluation, goals, device choice, fitting, follow-up.

Our questions are not real exam items, so treat them as practice for reasoning and recall. Judge your readiness by whether you can explain each answer, not by a score.

Sources & last verified

1. American Board for Certification in Orthotics, Prosthetics & Pedorthics — number of questions, time limit, delivery (official source). “The three and one half hour, 200 question, multiple choice exam assesses your knowledge of patient management.” Verified Oct 25, 2026 · source checked Oct 23, 2026.
2. American Board for Certification in Orthotics, Prosthetics & Pedorthics — retake policy, validity, renewal, score release (official source). “Once your application is approved, you will be granted three (3) years OR four (4) attempts at the exam.” Verified Oct 25, 2026 · source checked Oct 23, 2026.
3. American Board for Certification in Orthotics, Prosthetics & Pedorthics — eligibility (official source). “You must be 18 years or older and meet the following requirements to be eligible to take the practitioner exams.” Verified Oct 25, 2026 · source checked Oct 23, 2026.
4. American Board for Certification in Orthotics, Prosthetics & Pedorthics — registration deadline, late registration deadline (official source). “December 1, 2026” Verified Oct 25, 2026 · source checked Oct 23, 2026.

How we verify: editorial & fact-checking policy. Report an error: contact us.