Orthopedic Surgery Exam Domains 2026: Complete Guide to All 15 Content Areas

How the 15-Domain Outline Works

Board Certification in Orthopedic Surgery is administered by the American Board of Physician Specialties (ABPS) through the Board of Certification in Orthopedic Surgery (BCOS). Its written examination blueprint divides the field into 15 content areas, each carrying an approximate percentage of the exam. Those percentages total 100%, and they are described as approximate, which matters: a domain listed at 7% may show up as a few more or fewer items on your particular form.

The outline is also undated in the materials candidates can access, so you should read it as a structural map rather than a promise about any single year's test. Where it earns its value is in prioritization. A candidate who spreads study hours evenly across all 15 areas is quietly overinvesting in small domains and underinvesting in the big ones. If you are still sorting out the credential itself, our overview of what Orthopedic Surgery certification is and the eligibility requirements cover the groundwork before you dive into content.

Domain Weights at a Glance

The table below lists every domain in the initial written outline, ordered by weight. On a 200-question exam, a percentage translates roughly into an item count, but because the weights are approximate, use the "rough items" column only as a planning aid.

Notice the shape of the distribution. Five domains sit at 7% or above and account for 48% of the blueprint when you add the top-weighted three to Imaging. The bottom six domains combined contribute less than the top two. That asymmetry should drive your calendar.

The Three Heavy Hitters: Joints, Sports, Fractures

Joint Reconstruction/Replacement (13%)

Because this domain overlaps with Biomaterials/Biomechanics and Bone and Soft Tissue Infections, a strong foundation here pays off in neighboring content areas too. A question about a draining wound after arthroplasty may be scored under one domain but require knowledge from two.

Sports Medicine (11%)

Fractures/Bone Healing/Grafting (10%)

Mid-Weight Domains: Imaging, Infection, Joint Injuries, Spine, Arthritis

Between 7% and 8% sit five domains that are individually modest but collectively decisive. Skipping any one of them can cost more than ignoring several of the small domains combined.

Orthopedic Radiology and Imaging (8%)

The largest of the mid-weight group. Candidates should be comfortable choosing the right modality for a clinical question, recognizing classic radiographic signs, and interpreting MRI findings across the extremities and spine. Note that this domain is weighted at 7% on the recertification exam, so it stays important across your whole career. Imaging items often come with an image or a described finding, so practice reading studies, not just reading about them.

Bone and Soft Tissue Infections (7%)

Expect questions on osteomyelitis, septic arthritis, periprosthetic joint infection, and necrotizing soft tissue infection. Know the workup (laboratory markers, aspiration, imaging), organism patterns by host and setting, and the interplay of surgical debridement with antimicrobial therapy.

Joint Injuries (7%)

This domain covers acute injuries to joints, including dislocations and ligamentous disruption. Study reduction principles, associated neurovascular injury, and the sequelae of missed or inadequately treated injuries. It sits next to Sports Medicine in practice, so a combined review of the two is efficient.

Neurology and Spinal Disorders (7%)

Spinal stenosis, disc herniation, deformity, spinal trauma, and peripheral nerve conditions all belong here. High-yield skills include correlating a neurologic deficit with its level, recognizing red-flag presentations such as cauda equina syndrome, and distinguishing myelopathy from radiculopathy.

Arthritis and Connective Tissue Disorders (7%)

Inflammatory and degenerative arthropathies, crystal disease, and systemic connective tissue conditions with musculoskeletal manifestations. This domain tests your ability to distinguish arthropathies by pattern, laboratory profile, and radiographic appearance, and to know when orthopedic intervention is appropriate. Readers weighing overall exam difficulty may also want our breakdown in how hard the Orthopedic Surgery exam really is.

The Lighter Domains That Still Cost Points

Six domains carry 6% or less each. They are easy to neglect, and that is exactly the mistake. On a 200-item exam, even a 4% domain is around eight questions, enough to affect a borderline score.

How the Outline Shifts at Recertification

The initial outline is not the whole story. After you certify, the credential lasts eight years, and renewal involves 400 Category 1 CME credits (including 200 orthopedic and four approved ethics CME), a current license, and a 100-question, 2-hour recertification exam. That exam uses adjusted weights: Orthopedic Pathology moves to 3% and Radiology/Imaging to 7%. In other words, the recertification test leans slightly more on pathology recognition and slightly less on imaging than the initial exam does.

If you are early in your career, this is mostly background. If you are mid-cycle, it is a reminder to keep a steady CME rhythm and to refresh pathology after a long stretch of practice that may not touch tumor work often.

Written Format, Oral Exam, and Fee Mechanics

Question style

The initial written exam is 200 four-option, single-best-answer questions delivered over 4 hours. Four options means fewer distractors than five-option formats, but the best-answer wording still demands careful reading: more than one choice may be partly defensible, and you must choose the most appropriate. The written standard is set with a modified Angoff method, which means the passing standard is tied to expert judgments about item difficulty rather than a fixed curve. For a deeper look, see our passing score explainer.

The oral examination

The oral is a separate hurdle: four cases in 2 hours, with 2026 oral testing conducted by Zoom. Scoring requires the aggregate to meet case thresholds, so a weak performance on one case can be offset only to a point. Oral eligibility requires a passed written exam, 18 consecutive months of privileges at one qualifying institution, and a 12-month log of at least 100 primary-surgeon procedures. Note that an older overview page cites 200 procedures, which conflicts with the dedicated eligibility page; confirm the current number directly with the board before you assemble your log.

Fees and dates

In USD, the application costs $500 if timely and $995 if late; the written exam is $1,200 timely or $1,450 late; the oral is $1,600. An ordinary initial total comes to $3,300 by calculation. A written retake is $800, while an oral retake is charged the full oral fee. After initial certification, the annual Certification Management Fee is $895. For 2026, the written window runs May 1 to 21 and oral dates are November 6 and 7. Details and deadlines are in our guides on certification cost and exam dates.

Sequencing the Domains Across Your Prep

The only study-method advice worth giving here is about order. Because the written window opens May 1, work backward and assign domains by weight and by how much they depend on each other. A sample sequence over six weeks:

Adjust the order to your own weak spots, then pressure-test with timed sets. For a broader plan, our study guide and one-page cheat sheet pair well with this domain map, and the practice test platform lets you drill by domain.

Frequently Asked Questions