- What PA-COS Actually Means
- Who Issues It and How It Works
- Who Can Sit for It
- What the Exam Looks Like
- The Nine Content Areas
- Task Categories: A Second Lens on Every Question
- Fees and Registration Mechanics
- Keeping the Credential Active
- Who Hires PAs With This Credential
- Sequencing Your Preparation
- Frequently Asked Questions
- PA-COS here means Certified Physician Assistant - Orthopaedic Surgery, earned through NCCPA's Orthopaedic Surgery CAQ and used alongside PA-C.
- The exam has 120 multiple-choice questions in two 60-question, 60-minute blocks, delivered at Pearson VUE test centers.
- Fractures/Dislocations and Soft-Tissue Injuries and Disorders are 25% each; Joint Disorders adds 20%.
- Total fees are $350: $100 program registration plus $250 for the examination.
What PA-COS Actually Means
PA-COS stands for Certified Physician Assistant - Orthopaedic Surgery. It describes a physician assistant who has gone beyond general PA certification and demonstrated specialty-level knowledge in orthopaedic surgery. The official qualification behind the label is the Certificate of Added Qualifications in Orthopaedic Surgery (CAQ-OS), awarded by the National Commission on Certification of Physician Assistants (NCCPA).
One point trips up many first-time readers: this is not a standalone entry-level certification. You do not start your PA career with it. The CAQ-OS is held in addition to your PA-C, which is the general credential earned after PA school and the PANCE. Think of PA-C as your foundation and the orthopaedic CAQ as documented proof that you have specialized depth on top of it.
If you are comparing different ways people phrase the term, our pages on PA-COS meaning and what PA-COS stands for cover the naming conventions in more detail. For a high-level overview of the credential itself, see PA-COS Certification.
Who Issues It and How It Works
NCCPA is the same body that certifies PAs at the general level, and it administers the orthopaedic surgery CAQ through its Specialty Certificates program. Examinations are delivered at Pearson VUE test centers, so scheduling follows the familiar pattern of choosing a testing location and appointment once you are approved.
The process unfolds in a logical order. You register for the CAQ program, document that you meet the experience and CME requirements, obtain a qualifying attestation from someone who knows your clinical work, and then sit for the examination. If you pass, you hold the CAQ in orthopaedic surgery alongside your PA-C. For a deeper walk through how the pieces fit together, our guide to what PA-COS certification involves expands on each stage.
Who Can Sit for It
NCCPA sets firm prerequisites. Candidates must meet all of the following:
- Current PA-C status. Your general 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.
- 4,000 hours of specialty experience accrued within the preceding six years.
- 75 Category I CME credits in the specialty over six years, including 25 earned in the preceding two years.
- A signed attestation confirming relevant procedures and patient-case experience.
ACLS certification is recommended but not mandatory, so do not delay your application waiting on it.
The Attestation Requirement
The attestation is where many applicants lose time. It must come from a specialty physician, a lead or senior PA, or a physician or PA postgraduate program director who is familiar with your work.
- The attester documents your relevant procedures and patient-case experience.
- The attestation is due within 90 days of the score report.
- Identify your attester early, and make sure they actually observe or supervise your orthopaedic work.
The full checklist, including how the six-year windows are counted, is laid out in PA-COS Requirements: Eligibility, Prerequisites & How to Qualify.
What the Exam Looks Like
The initial CAQ examination consists of 120 multiple-choice questions divided into two blocks of 60 questions, each timed at 60 minutes. That works out to two hours of testing time. Separate from that, there is a 15-minute tutorial before you begin and a 15-minute break between blocks.
Two format details deserve attention:
- Review is limited to the active block. You can revisit questions within the block you are currently working on, but once you move on, you cannot return to the earlier block. Pace yourself so you finish each hour with time to flag and revisit uncertain items.
- Every question is clinical. Expect scenario-driven items drawn from real orthopaedic practice: a presenting complaint, relevant findings, imaging or lab data, and a question about diagnosis, workup, or management.
- Fracture classification, typical mechanisms, and associated injuries
- Neurovascular assessment and recognition of limb-threatening presentations
- Reduction, immobilization, and when operative fixation is indicated
- Dislocation management across major joints and post-reduction evaluation
- Ligament, tendon, and meniscal injuries, including exam maneuvers and imaging choices
- Overuse conditions, tendinopathies, and compressive neuropathies
- Rotator cuff, knee, ankle, and hand soft-tissue pathology
- Conservative versus surgical decision-making
- Osteoarthritis presentation, imaging findings, and stepwise treatment
- Inflammatory and crystalline arthropathies and how they differ from degenerative disease
- Indications for joint replacement and nonoperative alternatives
- Keep your PA-C current and your licensure unrestricted
- Earn 125 specialty Category I CME credits during the cycle
- Pass a maintenance examination
- Orthopaedic surgery group practices and multispecialty clinics
- Hospital and health-system orthopaedic service lines
- Sports medicine and trauma programs
- Joint replacement and spine centers
- Orthopaedic urgent care and fracture clinics
- Classification systems, neurovascular red flags, reduction principles
- Work NCCPA's free sample critiques to calibrate question style
- Physical exam maneuvers, imaging selection, conservative versus operative thresholds
- Degenerative versus inflammatory joint disease and arthroplasty indications
- Spine, bone tumors, infection and connective tissue disorders, pediatrics
- Perioperative and complication management; professional and legal issues
- Two 60-question, 60-minute blocks to rehearse pacing
- Review misses by task type: diagnosis, workup, or treatment
Because the block is exactly 60 minutes for 60 questions, you have about one minute per item. That is tight enough that hesitation on image-based or multi-step items can cost you. Read more about how that pacing feels in practice in How Hard Is the PA-COS Exam?, and for details on scoring thresholds, see PA-COS Passing Score.
The Nine Content Areas
The exam follows NCCPA's Content Blueprint for the Orthopaedic Surgery CAQ Examination, which is based on the 2023 PA Practice Analysis. The blueprint divides content into nine weighted categories:
| Content Area | 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 distribution is heavily top-weighted. Fractures/Dislocations, Soft-Tissue Injuries and Disorders, and Joint Disorders together account for 70% of the exam. That concentration should shape how you allocate study hours. For a deeper breakdown of each area, see PA-COS Exam Domains: Complete Guide to All 9 Content Areas.
Fractures/Dislocations (25%)
This is one of the two largest categories, and it rewards both pattern recognition and management judgment.
Soft-Tissue Injuries and Disorders (25%)
Equal in weight to fractures, and in many clinics the bulk of daily volume.
Joint Disorders (20%)
Degenerative and inflammatory joint disease, along with arthroplasty-related care.
The smaller categories should not be ignored just because they carry less weight. Spine, bone tumors, infection, pediatric orthopaedics, and perioperative complication management appear on every exam, and a candidate who skips them forfeits a meaningful slice of points. Even the 2% Professional, Legal, and Ethical Issues category is worth a short review session, since those items are often the most straightforward points to earn.
Task Categories: A Second Lens on Every Question
The blueprint also classifies questions by task, describing what you are being asked to do. These task categories overlap with the nine content areas; they are not additional domains and do not add up on top of them. Each question belongs to a content area and reflects a task.
| 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% |
The practical takeaway: half of the exam asks you to arrive at a diagnosis or choose a treatment. Another 40% tests your ability to examine the patient and pick and interpret the right studies. Memorizing facts in isolation will not carry you; you need to practice moving from a vignette to a decision.
Fees and Registration Mechanics
The total cost for the initial CAQ is $350, split into two parts: a $100 program registration fee and a $250 examination fee. You have six years from registration to complete the initial requirements, which gives you room to accumulate hours and CME while preparing.
If you do not pass on the first attempt, another examination attempt within that six-year period costs $250. NCCPA also sells a separate $50 practice examination with 60 questions, a 60-minute time limit, and 180 days of access. It does not provide item-by-item explanations and does not predict whether you will pass, so treat it as a format rehearsal rather than a readiness verdict. NCCPA's free sample-question critiques, by contrast, do include explanations and are worth working through.
For the complete financial picture, including what to budget beyond NCCPA fees, see PA-COS Certification Cost: Complete Pricing Breakdown. Timing and scheduling specifics are covered in PA-COS Exam Dates: Testing Windows, Deadlines & Scheduling.
Keeping the Credential Active
The orthopaedic CAQ is valid for ten years. To maintain it, you must:
The maintenance exam has an online, open-reference option: 120 questions, five minutes per question, and an approximately six-week completion window. These rules apply only to maintenance. They are not the conditions of the initial exam, which is the proctored, closed-format test described above. Candidates sometimes conflate the two, so keep them separate in your mind.
Who Hires PAs With This Credential
The natural home for a PA holding the orthopaedic CAQ is anywhere orthopaedic surgery is practiced. That typically includes:
In these settings, PAs commonly assist in the operating room, manage inpatient and postoperative care, evaluate new consults, and run clinic follow-ups. The credential signals to employers that you have verified specialty experience and passed a rigorous, orthopaedics-only examination. Whether it changes your compensation or negotiating position depends on your market; for a realistic discussion, see PA-COS Salary Guide, PA-COS jobs, and Is the PA-COS Certification Worth It?.
Sequencing Your Preparation
The weighting of the blueprint suggests a clear order of attack: build your foundation on the 70% core first, then fill in the smaller areas. A sample sequence over six weeks might look like this:
Fractures/Dislocations
Soft-Tissue and Joint Disorders
The Smaller Content Areas
Timed Practice
Adjust this to your own background. A PA who works in trauma daily may need less time on fractures and more on spine or pediatrics; someone in a sports clinic may flip that. For a fuller approach, read the PA-COS Study Guide, keep the PA-COS Cheat Sheet handy for last-minute review, and explore formal preparation options under PA-COS training. When you are ready to test yourself under realistic conditions, try the PA-COS practice tests to find the domains where your accuracy lags.
Key Takeaway
Start with Fractures/Dislocations, Soft-Tissue Injuries and Disorders, and Joint Disorders, since they make up 70% of the exam. Then use timed 60-question blocks to practice the one-minute-per-question pace the real test demands.
Frequently Asked Questions
No. It is an added qualification, the Orthopaedic Surgery CAQ, held together with your PA-C. You must maintain PA-C and unrestricted licensure to keep it. See also what is a PA-COS.
There are 120 multiple-choice questions in two 60-question blocks of 60 minutes each. A separate 15-minute tutorial and 15-minute break are provided, and review is limited to the block you are currently in.
The initial total is $350: $100 for program registration and $250 for the examination. A repeat attempt within the six-year window costs $250. The optional NCCPA practice exam is a separate $50.
You need 4,000 hours of specialty experience in the preceding six years and 75 Category I CME credits in six years, including 25 in the preceding two years. A qualifying attestation is also required, due within 90 days of the score report.
It is valid for ten years. Maintenance requires an active PA-C, unrestricted licensure, 125 specialty Category I CME credits, and a passing maintenance exam. Details on the lifecycle are in our overview of what PA-COS is.