- How the NCCPA Orthopaedic Surgery Blueprint Is Built
- Weighting Map: Where the 120 Questions Come From
- The Three Heavyweight Domains (70% of the Exam)
- Mid-Tier Domains: Joint-Adjacent Overlap and Perioperative Care
- The Small Domains That Still Cost Points
- Task Categories: The Second Lens on Every Question
- Format, Fees, and Test-Day Mechanics
- Sequencing Your Preparation by Domain Weight
- Eligibility Details That Shape Your Timeline
- Frequently Asked Questions
- Fractures/Dislocations and Soft-Tissue Injuries and Disorders each carry 25%; Joint Disorders adds 20%, together 70% of scored content.
- The nine Medical Content Categories are the weighted domains; Task Categories overlap them and are not extra domains.
- The exam is 120 multiple-choice questions in two 60-question, 60-minute blocks, with review limited to the active block.
- Initial CAQ cost is $350: $100 program registration plus $250 examination, with six years to complete requirements.
How the NCCPA Orthopaedic Surgery Blueprint Is Built
When people search for "PA-COS," they are usually looking at the orthopaedic surgery specialty credential for physician assistants. In NCCPA terms, that credential is the Certificate of Added Qualifications in Orthopaedic Surgery (CAQ-OS), earned by a PA who already holds PA-C. It is an added qualification layered on your core certification, not a separate initial PA credential. If you want the background first, see our explainer on what PA-COS certification is and the plain-language breakdown of what PA-COS stands for.
The exam objectives live in NCCPA's Content Blueprint for the Orthopaedic Surgery CAQ Examination. That document is undated, and NCCPA states it is based on the 2023 PA Practice Analysis. It slices the exam in two ways: by Medical Content Categories (nine weighted domains, the subject of this guide) and by Task Categories (what you are being asked to do with the content). Understanding both lenses is the difference between studying orthopaedics broadly and studying the way this exam samples it.
Weighting Map: Where the 120 Questions Come From
The nine Medical Content Categories and their weights are below. Because the exam has 120 questions, the percentages translate roughly to question counts, though NCCPA does not promise exact counts per form, so use them as planning estimates rather than guarantees.
| Domain | Weight | Rough share of 120 questions |
|---|---|---|
| Fractures/Dislocations | 25% | About 30 |
| Soft-Tissue Injuries and Disorders | 25% | About 30 |
| Joint Disorders | 20% | About 24 |
| Preoperative, Postoperative, and Complication Management | 7% | About 8 |
| Spine | 7% | About 8 |
| Benign and Malignant Bone Tumors | 5% | About 6 |
| Infectious Diseases and Connective Tissue Disorders | 5% | About 6 |
| Pediatric | 4% | About 5 |
| Professional, Legal, and Ethical Issues | 2% | About 2 to 3 |
The weights sum to 100%. The top three domains account for 70%, which means a candidate who is very strong in fractures, soft tissue, and joints but shaky on the long tail can still be competitive, while a candidate who is balanced but shallow everywhere will struggle. For more on how scoring works, read our breakdown of the PA-COS passing score and the exam difficulty guide.
The Three Heavyweight Domains (70% of the Exam)
Domain 2: Fractures/Dislocations (25%)
Fractures/Dislocations
This is the domain most closely tied to daily orthopaedic PA work in trauma and fracture clinics. Expect questions that move from presentation through imaging to a management decision.
- Fracture pattern recognition on radiographs and when advanced imaging is warranted
- Classification systems and what they imply for operative versus nonoperative care
- Reduction principles, immobilization choices, and weight-bearing instructions
- Neurovascular assessment and recognition of compartment syndrome
- Dislocation management and post-reduction checks
- Pediatric versus adult fracture considerations that change treatment
The most testable skill here is not memorizing eponyms but connecting a described injury to the right next step. If a stem describes a mechanism, an exam finding, and a film, the question usually asks what to do, what to order, or what to watch for.
Domain 7: Soft-Tissue Injuries and Disorders (25%)
Soft-Tissue Injuries and Disorders
The other 25% domain covers the tendon, ligament, muscle, and nerve conditions that fill outpatient orthopaedic schedules.
- Ligament and meniscal injuries of the knee, including exam maneuvers and their interpretation
- Rotator cuff, labral, and other shoulder pathology
- Tendinopathies, ruptures, and overuse syndromes
- Compressive neuropathies and how exam findings localize the lesion
- Hand and wrist soft-tissue conditions
- Nonoperative versus surgical indications and rehabilitation milestones
Physical examination performance carries real weight here, since soft-tissue diagnoses often hinge on the right test and the right interpretation of it. That connects directly to the Task Category weight on history and physical examination, covered below.
Domain 4: Joint Disorders (20%)
Joint Disorders
Joint disease spans degenerative, inflammatory, and post-surgical states, with a strong emphasis on decision-making across the treatment ladder.
- Osteoarthritis presentation, imaging findings, and stepwise management
- Indications and timing considerations for joint arthroplasty
- Inflammatory arthropathies as they present in an orthopaedic setting
- Injection therapy: indications, technique principles, and cautions
- Recognition of avascular necrosis and other joint-threatening conditions
Key Takeaway
If you only have time to be excellent at three things, make them fracture management, soft-tissue diagnosis, and joint disorder decision-making. Together they are 70% of the blueprint.
Mid-Tier Domains: Joint-Adjacent Overlap and Perioperative Care
Domain 6: Preoperative, Postoperative, and Complication Management (7%)
This domain rewards candidates who work in the operating room and on the inpatient side. It covers readiness for surgery, expected postoperative course, and recognition and handling of complications.
- Preoperative risk assessment and optimization concepts
- Postoperative protocols, activity restrictions, and thromboembolic prophylaxis considerations
- Recognition of surgical-site infection, wound problems, and implant-related complications
- Management of nonunion, malunion, and delayed healing
Because complications often follow fractures or arthroplasty, expect content here to overlap in feel with Domains 2 and 4. Study them together.
Domain 8: Spine (7%)
Spine is a modest slice of the exam but one with a distinct vocabulary. Candidates from extremity-heavy practices often under-prepare it.
- Low back pain differentials and red-flag features that change management
- Radiculopathy versus myelopathy and how to tell them apart on exam
- Cervical, thoracic, and lumbar degenerative conditions
- Spinal fractures and stability concepts at a PA-appropriate level
- When imaging and referral are appropriate
The Small Domains That Still Cost Points
Four domains together account for 16% of the exam. They are small individually, but they can be worth studying efficiently because the content is more bounded than the big domains.
Domain 1: Benign and Malignant Bone Tumors (5%)
A bounded topic with recurring patterns.
- Radiographic features that suggest benign versus aggressive lesions
- Common benign bone lesions and their typical presentations
- Primary malignant bone tumors and when to refer urgently
- Metastatic disease to bone and pathologic fracture risk
Domain 3: Infectious Diseases and Connective Tissue Disorders (5%)
Pairs musculoskeletal infection with systemic connective tissue disease.
- Septic arthritis and osteomyelitis: presentation, workup, and urgency
- Diagnostic interpretation of inflammatory markers and joint fluid findings
- Connective tissue disorders as they manifest in the musculoskeletal system
Domain 5: Pediatric (4%)
Pediatric orthopaedics has its own logic, especially around growth and development.
- Physeal injuries and growth-related considerations
- Developmental conditions of the hip and lower extremity
- Pediatric fracture patterns and when they raise concern for non-accidental trauma
Domain 9: Professional, Legal, and Ethical Issues (2%)
The smallest domain, worth a short, focused review rather than a long study block.
- Informed consent and documentation expectations
- Scope of practice and supervision considerations for PAs
- Professional conduct and ethical dilemmas in surgical care
Task Categories: The Second Lens on Every Question
The same blueprint also classifies questions by the task they test. These categories overlap the nine domains. They are not additional additive domains, so do not add them to the 100%. A single question can be both a Fractures/Dislocations item and a Treatment/Intervention item.
| Task Category | Weight |
|---|---|
| History Taking and Performing Physical Examination | 20% |
| Ordering and Interpreting Diagnostic and Laboratory Studies | 20% |
| Formulating Most Likely Diagnosis | 25% |
| Patient Education and Preventive Measures | 5% |
| Treatment/Intervention | 25% |
| Applying Scientific Concepts | 3% |
| Professional, Legal, and Ethical Issues | 2% |
The practical takeaway: diagnosis (25%) and treatment (25%) make up half the task weight. Practice questions that force you to commit to a most-likely diagnosis from limited information, and then to pick an intervention, rather than passively reading about conditions. Our PA-COS study guide explains how to turn this into a daily routine, and the PA-COS cheat sheet condenses the high-yield facts for last-week review.
Format, Fees, and Test-Day Mechanics
The initial CAQ examination is delivered at Pearson VUE test centers. It contains 120 multiple-choice questions split into two blocks of 60 questions, with 60 minutes allotted per block, for two hours of testing. A separate 15-minute tutorial and a 15-minute break sit outside the testing time. Review is limited to the active block, so you cannot return to the first block after moving to the second. Pace yourself accordingly, and flag-and-return only within the block you are in.
| Item | Detail |
|---|---|
| Total cost | $350 ($100 program registration + $250 examination) |
| Time to complete initial requirements | Six years |
| Another attempt within that period | $250 |
| Questions | 120 multiple choice, two 60-question blocks |
| Time per block | 60 minutes |
| Tutorial and break | 15 minutes each, separate from testing time |
For a fuller pricing picture, including how the fee structure plays out over the six-year window, see our certification cost breakdown. For scheduling details, the exam dates guide covers how to plan your testing appointment.
Sequencing Your Preparation by Domain Weight
This is the one place general scheduling logic applies, and it is tied directly to the blueprint. The idea is to front-load the heavy domains, pair overlapping content, and leave the bounded small domains for efficient late-stage passes. The plan below is an example for a roughly eight-week runway, adjustable to your own timeline.
Fractures/Dislocations (25%)
- Work through upper extremity, then lower extremity, then pelvis and axial trauma
- Pair each fracture with its classification, imaging, and management decision
- Add dislocations and neurovascular red flags
Soft-Tissue Injuries and Disorders (25%)
- Region by region: shoulder, elbow, hand/wrist, hip, knee, foot/ankle
- Drill physical exam maneuvers and what a positive result means
- Review compressive neuropathies and tendon pathology
Joint Disorders (20%) plus Perioperative Care (7%)
- Study arthritis management ladders and arthroplasty indications
- Pair with postoperative course and complication recognition, since they overlap
Spine, Tumors, Infection, Pediatric
- Cover the four mid-to-small domains in one sweep
- Focus on red flags, pattern recognition, and urgent-referral triggers
Mixed practice and the 2% domain
- Take timed 60-question sets to rehearse a single block
- Give Professional, Legal, and Ethical Issues a short, focused review
Why this order? Fractures and soft tissue are the two largest single domains and are the most likely to expose gaps. Joint Disorders and perioperative content overlap conceptually, so studying them back to back reinforces both. The small domains benefit from a late pass because their content is narrower. For the full strategy behind this, including how to review missed questions, see the study guide, and for a high-level look at how this domain breakdown fits into overall preparation, our companion piece on the PA-COS exam domains guide covers the same blueprint from a quick-reference angle.
Eligibility Details That Shape Your Timeline
Your study calendar also depends on whether you can sit for the exam yet. Requirements include a current PA-C, unrestricted PA licensure in a US jurisdiction or territory (or unrestricted government practice privileges), and unrestricted status on all licenses you hold. You also need 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. ACLS is recommended but not mandatory.
A specialty physician, lead or senior PA, or a physician/PA postgraduate program director familiar with your work must attest to relevant procedures and patient-case experience. That attestation is due within 90 days of your score report. Because the attestation depends on someone else's schedule, line it up early rather than waiting until after you test. The complete checklist is in our PA-COS requirements guide.
Once earned, the credential is valid for ten years. Maintenance requires keeping PA-C and unrestricted licensure, earning 125 specialty Category I CME credits during the cycle, and passing a maintenance examination. The maintenance-only online option is open-reference, with 120 questions, five minutes per question, and an approximately six-week completion window. Those are maintenance rules and do not apply to the initial examination, which is closed-format at a test center. If you are weighing the long-term value, our ROI analysis and salary guide discuss the career side.
Frequently Asked Questions
There are nine weighted Medical Content Categories in NCCPA's Content Blueprint for the Orthopaedic Surgery CAQ Examination. The separate Task Categories overlap these domains and are not additional additive domains.
Fractures/Dislocations and Soft-Tissue Injuries and Disorders each carry 25%, and Joint Disorders carries 20%. Together they represent 70% of the exam, so they deserve the largest share of your study time.
The exam has 120 multiple-choice questions in two 60-question, 60-minute blocks. Review is limited to the active block, so you cannot return to the first block once you move into the second.
The total is $350, made up of $100 program registration and $250 for the examination. You have six years to complete the initial requirements, and another examination attempt within that period costs $250.
No. The $50 practice examination has 60 questions, 60 minutes, and 180-day access, but it does not provide item-by-item explanations or predict passing. Use it to practice pacing, and use the free sample-question critiques and a question bank for explanation-based learning.
Mastering the blueprint is mostly about proportion: spend your hours where the points are, practice the diagnose-and-treat decisions the task categories emphasize, and give the small domains a disciplined, efficient pass. When you are ready to test your recall under realistic conditions, the PA-COS practice questions are built around this same nine-domain structure.