What Is ONC?

What ONC Means in Orthopaedic Nursing

ONC stands for Orthopaedic Nurse - Certified. It is a specialty certification for registered nurses who care for patients with musculoskeletal conditions, from hip and knee arthritis to fractures, sports injuries, bone tumors, and pediatric deformities. Holding the credential signals that a nurse has met a defined experience threshold and passed a standardized exam built around orthopaedic nursing practice.

The acronym is shared by other, unrelated credentials in healthcare, so it is worth being precise. This article concerns only the orthopaedic nursing certification. It is not an oncology nursing credential, and it is not any of the similarly abbreviated certifications in other fields. If you have also seen the term explained on pages such as what ONC stands for or ONC meaning, the orthopaedic nursing definition above is the one that applies on this site.

For a quick orientation to how the credential is described elsewhere on this site, see What Is ONC Certification? and the broader ONC certification overview.

Who Issues the Credential and Why It Exists

The credential is administered by the Orthopaedic Nurses Certification Board (ONCB). ONCB publishes the candidate handbook, sets the eligibility rules, maintains the exam content outline, and governs recertification. Applications are processed through ONCB's LearningBuilder system, and testing is delivered through Meazure Learning, either at a computer testing center or by live remote proctoring. The handbook describes delivery in the United States, Puerto Rico, and Canada.

The purpose of the certification is practical: orthopaedic care involves specialized assessment (neurovascular checks, cast and traction management, wound and pin-site care), predictable complications (compartment syndrome, infection, thromboembolism), and long rehabilitation arcs. A standardized credential gives employers and patients a common reference for that expertise.

Exam Format: 150 Questions, 135 Scored

The ONC exam consists of 150 multiple-choice questions delivered in three hours. Of those, 135 are scored and 15 are unscored pretest items that ONCB uses to evaluate future questions. You will not know which items are unscored, so every question deserves full effort.

Several test-day conditions shape how you prepare:

• Closed book. No calculators or unauthorized reference materials are permitted.
• Identification. You must present valid government-issued photo ID that matches your registration.
• Breaks count against you. Breaks are allowed, but they occur within the exam clock rather than adding time.
• Live remote option. If you test from home, additional proctoring requirements apply; review the live remote proctoring instructions before booking.

Because three hours for 150 items works out to roughly 1.2 minutes per question, pacing matters more than most candidates expect. Practice with timed sets, and if you want a realistic warm-up, the ONC practice test on the main site is built for exactly that purpose.

The Content Outline: Eight Conditions, Six Nursing Tasks

The ONCB Detailed Content Outline is unusual in that it is organized on two intersecting axes, not as one list of mutually exclusive domains. One axis describes what condition the patient has; the other describes what nursing task you are performing. A single exam question might sit at the intersection of both, such as managing pain in a patient with a hip fracture. For this reason, the allocations on each axis should never be added together.

We list the outline here as fourteen headings (eight conditions plus six tasks) so every published category is represented. For a deeper walk through each one, see the complete guide to all 14 ONC content areas.

Axis one: the eight condition categories

ONCB publishes these as item counts out of the 135 scored questions, not as percentage weights:

The eight counts total 135, matching the scored portion of the exam. Notice how lopsided the distribution is: degenerative disorders alone accounts for 51 items, and trauma adds another 26. Together they cover more than half the scored exam.

The remaining condition categories are smaller but should not be skipped. Sports injuries (15 items), metabolic bone disorders (12), and inflammatory disorders (11) each carry enough weight to affect a borderline result, while congenital/pediatric disorders, musculoskeletal tumors (7 each), and neuromuscular disorders (6) are lower-volume but are often where well-prepared candidates lose avoidable points because they studied them last.

Axis two: the six cross-cutting nursing tasks

The task axis uses item ranges rather than fixed counts, because the number of questions in each task varies slightly by exam form:

Pain (35-45) is the largest task area, followed closely by Complications (31-41) and Self Care (22-32). These three tasks dominate the second axis and reward candidates who can apply multimodal analgesia principles, recognize deterioration early, and teach patients to manage their own recovery. Nutrition and psychosocial items are small in number, but they tend to be straightforward points if you have reviewed them.

Eligibility: Who Can Sit for the Exam

Eligibility is strictly defined, and meeting it before you apply saves time and money. The full details are covered in the ONC requirements guide, but the core rules are:

• Licensure: a current, unrestricted RN license, or the board's specified foreign first-level nurse/equivalency route.
• Experience: two full years of experience as a registered nurse.
• Orthopaedic practice hours: at least 1,000 hours of orthopaedic RN practice within the previous three years.
• Verification: your immediate supervisor must sign the verification, and it must be signed within 180 days of your application.

A BSN is not required. The credential is built around hands-on orthopaedic experience, so an RN with an associate degree or diploma can qualify as long as the practice-hour and experience requirements are met.

Registration, Fees, and Test-Day Rules

Fees depend on membership status. The initial exam fee is US$325 for eligible full members of NAON, AANP, NOVA, or CONA, and US$450 for non-members. Student and associate memberships do not qualify for the member rate, and the qualifying membership must remain active through your examination date. Ordinary retake fees are US$275 for members and US$400 for non-members.

Because the member discount is US$125 on the initial exam, many candidates compare it against the cost of joining a qualifying organization. Our ONC certification cost breakdown walks through that math and other related expenses.

If you do not pass, ordinary retesting requires at least 90 days between examinations. ONCB also runs a separate Retest for Success program with its own terms, so check those terms directly rather than assuming they match the standard retake rules.

Passing Score and Pass-Rate Context

The current ONC Exam Description publishes a raw passing threshold of 97 out of 135 scored questions. Because ONCB uses Angoff standard setting and equating, the effective cut score can differ slightly between exam forms. Treat 97/135 as the published benchmark, not a guarantee for every form. The ONC passing score guide explains how to interpret this.

On pass rates, the most recent figure ONCB has published in its official certification statistics summary is 58% for 2020, with 316 passes among 544 examinees. Be careful with that number: it is a 2020 figure, not a 2026 one, and it is not verified as a first-attempt-only rate. It tells you that the exam is a genuine professional hurdle rather than a formality, but it should not be treated as a prediction. For fuller context, read what the pass-rate data shows and how hard the ONC exam is.

Staying Certified: The Five-Year Cycle

ONC certification runs on a five-year term governed by ONCB's June 30 expiration rule. You can renew in one of two ways.

Renewal by continuing education

• Current, unrestricted RN licensure
• At least 1,000 hours of orthopaedic practice in the previous five years
• 75 contact hours, including at least 50 clinical orthopaedic hours and no more than 25 general nursing hours
• A renewal fee of US$275 for eligible members or US$400 for non-members

Renewal by re-examination

Passing the exam again before your certification expires is an accepted alternative to submitting continuing education. Older materials may reference a 100-hour requirement or a 70+30 split; those are superseded by the current 75-hour structure above.

Where the Credential Fits in Your Career

ONC is most relevant for RNs working where orthopaedic patients are concentrated: orthopaedic and joint-replacement units, spine programs, trauma floors, orthopaedic surgery clinics, ambulatory surgery centers, and rehabilitation settings. Nurses in pediatric orthopaedic programs and sports medicine clinics also pursue it.

Whether the credential changes your pay or promotion path depends heavily on your employer, since some organizations offer certification differentials or recognize it in clinical ladder programs and others do not. Rather than relying on a generalized figure, check your own institution's policies. Our ONC salary guide, ONC jobs overview, and analysis of whether the certification is worth it lay out the factors to weigh.

Sequencing Your Preparation Around the Outline

You do not need an elaborate method; you need a plan that mirrors where the points are. Here is one way to sequence preparation across the outline. For a longer, resource-focused plan, see the ONC study guide, and keep the ONC cheat sheet handy for last-week review.

Use the ONC practice questions throughout, not only at the end, so you learn the exam's scenario-based question style early.

Frequently Asked Questions