- What This Credential Actually Is
- The Numbers at a Glance
- Eligibility Checklist
- Exam Format and Test-Day Mechanics
- Blueprint Weights: Where the Points Live
- Task Categories: The Second Lens
- Domain-by-Domain Cheat Notes
- A Domain-Weighted Sequencing Plan
- Keeping the Credential Valid
- Official Practice Tools and What They Do Not Do
- Frequently Asked Questions
- The exam is 120 multiple-choice questions in two 60-question, 60-minute blocks, and you cannot revisit a finished block.
- Fractures/Dislocations and Soft-Tissue Injuries and Disorders are 25% each; Joint Disorders adds 20%, so three domains cover 70%.
- You need 4,000 specialty hours and 75 Category I CME credits (25 in the last two years) within six years.
- Total initial cost is $350: $100 registration plus $250 examination, with retakes at $250.
What This Credential Actually Is
Before memorizing a single fracture classification, get the identity of the credential straight. The Certified Physician Assistant - Orthopaedic Surgery pathway is governed by the National Commission on Certification of Physician Assistants (NCCPA). The official qualification behind it is the Certificate of Added Qualifications in Orthopaedic Surgery (CAQ-OS), earned by PAs who already hold the PA-C. It is not a separate initial PA certification and it does not replace the PA-C; it sits on top of it as a specialty attestation of knowledge and experience.
If you are still sorting out terminology, our explainers on what PA-COS is and what PA-COS stands for cover the naming in more depth. This cheat sheet focuses on the facts you need to qualify, sit for the exam, and allocate study time sensibly.
The Numbers at a Glance
This table is the one-page core of the cheat sheet. Everything here comes from NCCPA's published information for the Orthopaedic Surgery CAQ.
| Item | What to Know |
|---|---|
| Governing body | NCCPA |
| Testing provider | Pearson VUE test centers |
| Total initial fee | $350 ($100 program registration + $250 examination) |
| Retake within the six-year window | $250 per additional attempt |
| Time allowed to finish initial requirements | Six years |
| Exam length | 120 multiple-choice questions |
| Exam structure | Two 60-question blocks, 60 minutes each |
| Specialty experience | 4,000 hours in the preceding six years |
| Specialty Category I CME | 75 credits in six years, including 25 in the preceding two years |
| Validity | Ten years |
| Maintenance CME | 125 specialty Category I credits during the cycle |
For a fuller pricing walk-through, including how the registration and exam components are billed, see our PA-COS certification cost breakdown.
Eligibility Checklist
Candidates often focus on the exam and underestimate the documentation burden. Run through these requirements early, because several have look-back windows that cannot be shortened.
- Current PA-C. The base certification must be active.
- Unrestricted licensure. You need unrestricted PA licensure in a US jurisdiction or territory, or unrestricted government practice privileges. Every license you hold must be unrestricted, not just the one you practice under.
- 4,000 hours of specialty experience in orthopaedic surgery within the preceding six years.
- 75 specialty Category I CME credits within six years, of which 25 must fall in the preceding two years.
- Attestation of procedures and patient-case experience. A specialty physician, a lead or senior PA, or a physician/PA postgraduate program director who is familiar with your work must attest. The attestation is due within 90 days of your score report.
- ACLS is recommended but not mandatory.
Our PA-COS requirements guide goes deeper on how to document hours and CME so the application moves smoothly.
Exam Format and Test-Day Mechanics
The exam is delivered at Pearson VUE test centers. It is 120 multiple-choice questions, split into two blocks of 60 questions with 60 minutes each. That is two hours of actual testing, so you have roughly a minute per question, which is tight for case-style items that embed a history, exam findings, and imaging descriptions.
Tutorial, break, and block rules
- A separate 15-minute tutorial precedes the exam, and a separate 15-minute break sits between the blocks. Neither eats into your testing time.
- Review is limited to the active block. Once you submit or time out of Block 1, you cannot go back to it from Block 2.
- Because of that, budget your time per block rather than per exam, and flag-and-return only within the block you are in.
Key Takeaway
Practice in 60-question, 60-minute sets. Training yourself to finish a full block with a few minutes left for flagged items matches how the real exam enforces pacing, since you will not get a second look once the block closes.
For more on how the format translates into difficulty, read how hard the PA-COS exam is, and for scheduling logistics see PA-COS exam dates and scheduling.
Blueprint Weights: Where the Points Live
The nine domains below are the weighted Medical Content Categories in NCCPA's currently linked Content Blueprint for the Orthopaedic Surgery CAQ Examination. The blueprint is undated, and the issuer states it is based on the 2023 PA Practice Analysis. Always check NCCPA's site for the latest version before you finalize your study plan.
| Domain | Weight |
|---|---|
| Fractures/Dislocations | 25% |
| Soft-Tissue Injuries and Disorders | 25% |
| Joint Disorders | 20% |
| Preoperative, Postoperative, and Complication Management | 7% |
| Spine | 7% |
| Benign and Malignant Bone Tumors | 5% |
| Infectious Diseases and Connective Tissue Disorders | 5% |
| Pediatric | 4% |
| Professional, Legal, and Ethical Issues | 2% |
The arithmetic is the most useful thing on this page: Fractures/Dislocations, Soft-Tissue Injuries and Disorders, and Joint Disorders together account for 70% of the exam. That is roughly 84 of the 120 questions if the exam follows the blueprint proportions. Our complete guide to the nine PA-COS content areas expands on each category.
Task Categories: The Second Lens
The same blueprint also sorts questions by what you are being asked to do. These Task Categories overlap with the content domains; they are another way of slicing the same questions, not additional additive domains. A single question can be a fracture item (content domain) that tests diagnosis (task category).
| Task Category | Weight |
|---|---|
| Formulating Most Likely Diagnosis | 25% |
| Treatment/Intervention | 25% |
| History Taking and Performing Physical Examination | 20% |
| Ordering and Interpreting Diagnostic and Laboratory Studies | 20% |
| Patient Education and Preventive Measures | 5% |
| Applying Scientific Concepts | 3% |
| Professional, Legal, and Ethical Issues | 2% |
Domain-by-Domain Cheat Notes
The notes below are study prompts, not a substitute for your orthopaedic texts. They point at the kind of reasoning each domain tends to reward in an orthopaedic surgery setting.
Fractures/Dislocations (25%)
The largest domain, shared with soft-tissue conditions. Expect questions that move from presentation to imaging interpretation to definitive management.
- Recognizing fracture patterns, associated injuries, and when a presentation signals a neurovascular or compartment emergency
- Choosing between operative and nonoperative management and knowing the immobilization and weight-bearing logic behind each
- Reduction principles and post-reduction assessment for common dislocations
- Healing complications such as malunion, nonunion, and avascular concerns
Soft-Tissue Injuries and Disorders (25%)
Equal in weight to fractures, and often under-studied by candidates who gravitate toward bony pathology.
- Ligament, tendon, and meniscal injuries: mechanism, examination maneuvers, and imaging choice
- Overuse and entrapment conditions in the shoulder, elbow, wrist, hand, and foot
- Distinguishing partial from complete tears and matching that to treatment pathways
Joint Disorders (20%)
Degenerative, inflammatory, and post-traumatic joint problems, with an eye toward nonoperative versus surgical candidacy.
- Osteoarthritis workup and the stepwise treatment ladder
- Differentiating inflammatory from degenerative presentations from history, exam, and labs
- Indications for arthroplasty and the clinical reasoning behind timing
Preoperative, Postoperative, and Complication Management (7%)
A smaller domain, but one that connects directly to daily PA work in the surgical setting.
- Preoperative risk assessment and optimization
- Recognizing postoperative complications and their early signs
- Wound, infection, and thromboembolic concerns after orthopaedic procedures
Spine (7%)
Focus on pattern recognition and red-flag screening.
- Radiculopathy versus myelopathy versus cauda equina presentations
- Appropriate imaging and when urgent referral or intervention is warranted
Benign and Malignant Bone Tumors (5%)
Low weight but reasoning-heavy; a handful of questions can hinge on recognizing a worrisome presentation.
- Imaging features that suggest benign versus aggressive lesions
- Age and location patterns, and the workup before biopsy or referral
Infectious Diseases and Connective Tissue Disorders (5%)
Pairs musculoskeletal infection with systemic connective tissue conditions that present with joint or soft-tissue complaints.
- Septic arthritis and osteomyelitis: diagnosis, urgency, and management principles
- Connective tissue disorders that show up in orthopaedic clinics
Pediatric (4%)
Age-specific conditions that differ from adult patterns.
- Growth-plate considerations in pediatric fractures
- Common developmental and acquired pediatric orthopaedic conditions and their typical age groups
Professional, Legal, and Ethical Issues (2%)
The smallest slice, and the only domain that is purely non-clinical.
- Informed consent, scope-of-practice boundaries, and documentation expectations
- Supervision and collaboration norms in surgical practice
A Domain-Weighted Sequencing Plan
This is the only study-method section in this cheat sheet, and it is deliberately tied to the blueprint. The logic: give the 70% block the most time and the earliest slots, then use the smaller domains to fill gaps. For a fuller plan, see our PA-COS study guide.
Fractures/Dislocations
- Largest single domain; start here while energy is highest
- Pair imaging review with management decisions, since diagnosis and treatment are each 25% of the task categories
Soft-Tissue Injuries and Disorders
- Equal weight to fractures, so give it equal time
- Drill physical examination maneuvers, since history and exam is 20% of tasks
Joint Disorders
- Cover degenerative versus inflammatory reasoning and surgical indications
Perioperative, Spine, Tumors, Infection, Pediatric, Professional
- Group the smaller domains together; they total 30% combined
- Finish with timed 60-question blocks to rehearse the real pacing
If you are weighing how much effort to commit, our look at PA-COS passing score information and the pass rate discussion will help you calibrate expectations, and you can drill the high-weight domains with our PA-COS practice tests.
Keeping the Credential Valid
Passing the initial exam is not the end of the obligations. The CAQ is valid for ten years. To keep it, you must maintain your PA-C and unrestricted licensure, earn 125 specialty Category I CME credits during the cycle, and pass a maintenance examination.
Because the initial exam is closed-block and timed, memorization and pattern recognition matter far more on the first attempt than they will later in your cycle.
Official Practice Tools and What They Do Not Do
NCCPA offers a separate $50 practice examination with 60 questions, 60 minutes, and 180-day access. It is a useful way to experience one block's worth of timing, but be realistic about its limits: it does not provide item-by-item explanations, and it does not predict whether you will pass.
NCCPA also publishes free sample questions with critiques, and those critiques do include explanations. Use them to see how the exam phrases clinical scenarios and what rationale the writers expect. Pair them with explanation-rich practice from our main practice test site so every missed question teaches you something.
If you are still deciding whether the investment makes sense, our analysis of whether the PA-COS certification is worth it lays out the trade-offs, and our PA-COS jobs overview covers where orthopaedic surgery PAs tend to work, from surgical practices and hospital orthopaedic services to trauma and specialty clinics.
Frequently Asked Questions
The exam has 120 multiple-choice questions divided into two 60-question blocks of 60 minutes each. A separate 15-minute tutorial and a separate 15-minute break do not count against testing time, and review is limited to the active block.
Fractures/Dislocations and Soft-Tissue Injuries and Disorders each carry 25%, and Joint Disorders carries 20%. Together those three domains make up 70% of the blueprint, so they deserve the largest share of your study time.
You need a current PA-C, unrestricted PA licensure in a US jurisdiction or territory (or unrestricted government practice privileges), 4,000 hours of specialty experience in the preceding six years, and 75 specialty Category I CME credits in six years, including 25 in the preceding two years. A qualified attester must also verify your procedures and patient-case experience within 90 days of the score report.
The total initial cost is $350, made up of a $100 program registration fee and a $250 examination fee. You have six years to complete the initial requirements, and another examination attempt within that period costs $250.
It is valid for ten years. You must keep your PA-C and unrestricted licensure, earn 125 specialty Category I CME credits during the cycle, and pass a maintenance examination, which has its own open-reference online format distinct from the initial exam.