Orthopedic Surgery Pass Rate 2026: What the Data Shows

What the 98.2% Pass Rate Actually Means

The American Osteopathic Board of Orthopedic Surgery (AOBOS) publishes a 98.2% pass rate for the Part I Written Exam, and it's easy to read that number and assume it describes a single testing cycle. It doesn't. The figure is a five-year aggregate covering first-time, board-eligible examinees. That distinction matters more than it sounds like it should.

An aggregate spanning five administration years smooths out any single year's difficulty spikes, cohort strength, or question-bank refreshes. It tells you that, over a longer window, the overwhelming majority of properly prepared, board-eligible candidates who sit for the exam pass it on their first attempt. It does not tell you what happened in any one specific May administration, and it does not include repeat-attempt data or candidates who withdrew before eligibility was finalized.

Who Is Counted in the Published Number

The pass rate applies specifically to first-time, board-eligible examinees. To even be counted in that population, a candidate has to clear the eligibility bar the AOBOS sets for Part I:

• Graduation from an ACGME-accredited orthopedic surgery residency, or
• Current PGY-4 or PGY-5 status (PGY-4 applicants require documented program-director approval)
• Satisfaction of the board's application and ethics requirements

This matters for interpreting the rate: the pool isn't "anyone who registers." It's a pre-screened population that has already cleared residency-level and program-director-level filters. If you want the full breakdown of who qualifies and how the approval process works, the Orthopedic Surgery Requirements 2026 guide walks through each eligibility path in detail.

Why an Aggregate Rate Can Hide Individual Risk

A high aggregate pass rate is reassuring, but it's a population statistic, not a personal forecast. Two candidates can both be "board-eligible" and still walk into the exam room with very different odds, depending on how deliberately they prepared against the exam's actual domain structure.

The written exam draws from ten domains with published percentage ranges that the AOBOS deliberately keeps unequal - Basic Science, Joint, and Trauma are weighted far more heavily than Tumor or Infection. A candidate who studies all ten domains equally is, in effect, under-preparing for the highest-yield content and over-preparing for the lowest-yield content. That's the kind of gap an aggregate pass rate can't reveal but that shows up in an individual's actual score.

The Exam Structure Behind the Numbers

Understanding the exam's format helps explain why disciplined, domain-weighted preparation drives individual outcomes even when the aggregate pass rate is high. The AOBOS Part I Written Exam consists of:

• 250 multiple-choice questions total
• Split across three sections of 120 minutes each
• Six hours of active testing time, plus two optional 15-minute breaks (six hours 30 minutes including breaks)

The exam is remotely proctored under AOA MonitorEDU/PARADIGM arrangements, which means candidates need a private testing room, a compatible computer and mobile device, the secure browser installed, and completed technical checks before test day. The platform provides an online calculator, a scratch pad, and laboratory values during the exam, and AOBOS permits physical whiteboards as a supplemental tool. For a section-by-section breakdown of what each testing block tends to emphasize, see the Orthopedic Surgery Exam Domains 2026 guide.

Domain Weighting and Where Points Are Won or Lost

The ten domains and their official percentage ranges should be studied as-is - they are not meant to be normalized into equal shares. Here's the full breakdown:

Basic Science, at 12-16%, is the single largest domain on the exam - larger than Tumor and Infection combined, by a wide margin. Joint and Trauma follow closely at 11-14% each. Together, these three domains can represent well over a third of the entire exam's questions.

For a full walkthrough of all ten domains, including Tumor and Infection at the lower end of the weighting scale, the complete domains guide is the most direct resource on the site.

Scoring Mechanics: The 500 Passing Score

The Part I Written Exam is scored on a scaled range of 200 to 800, and the passing threshold is a scaled score of 500. Scaled scoring means the raw number of correct answers required to reach 500 can shift slightly between administrations, since the scale adjusts for question difficulty across different exam forms.

This is a meaningful nuance when interpreting the pass rate: a 98.2% five-year aggregate doesn't mean the exam is "easy" in raw terms - it means that, across five years of scaled administrations, most board-eligible first-time candidates cleared the 500 threshold. For a deeper explanation of how the scaled score is calculated and what it implies for your target raw performance, see the Orthopedic Surgery Passing Score 2026 guide.

Registration Timeline and Fee Mechanics

Pass-rate context is incomplete without understanding the registration calendar, because missed deadlines and administrative missteps are avoidable failure points that have nothing to do with content mastery.

• Applications open in October
• First deadline: the first business day in March
• Final deadline: the first business day in April
• The written exam itself is administered during the second week of May

The Part I Written Exam fee is $1,000. First-time AOAO resident members can request a $500 coupon discount, reducing their written exam fee to $500. This is distinct from the separate Clinical Exam, which costs $2,250 with a $250 late fee after its first deadline - those Clinical Exam fees should never be confused with Part I written exam costs when budgeting. A complete fee breakdown, including how the resident discount interacts with the standard fee, is available in the Orthopedic Surgery Certification Cost 2026 guide.

For the full annual calendar, including how the October-to-May cycle repeats and what to plan around it, see the Orthopedic Surgery Exam Dates 2026 guide.

Written Exam vs. Clinical Exam vs. Other Boards

Passing the Part I Written Exam is a milestone, not the finish line. Full AOBOS certification also requires the separate Clinical Exam, which involves surgical-practice documentation and an oral defense of selected cases, followed by AOA approval. The written exam's 98.2% aggregate pass rate does not extend to the Clinical Exam - the two are evaluated on entirely different criteria and should be budgeted and scheduled as separate milestones.

Candidates researching options online will also encounter other credentials that use similar naming conventions in orthopedic surgery certification. This site's coverage is focused exclusively on the AOBOS pathway - the osteopathic board's Part I Written Exam and its associated Clinical Exam and recertification process. If you're comparing pathways, confirm which certifying body and which specific exam a resource is describing before applying any fee, date, or scoring detail to your own situation; mixing details between different boards is a common and costly mistake.

A Domain-Aligned Study Timeline

Generic study techniques only help if they're pointed at the right targets. Given the domain weight table above, a preparation sequence that front-loads the heaviest domains and reserves the lightest ones for later review tends to make the most efficient use of limited study weeks.

For a more granular week-by-week plan and recommended resources, the Orthopedic Surgery Study Guide 2026 expands on this sequencing, and running timed sections on the full practice test platform is one of the more direct ways to rehearse the three-section, six-hour format before test day.

Recertification: A Different Kind of Pass Rate

The 98.2% figure applies only to the initial Part I Written Exam. Once certified, diplomates in the 2025-2027 Osteopathic Continuous Certification (OCC) cycle maintain status through active licensure, CME (60 credits, including 15 Category 1-A), and a longitudinal assessment component rather than a repeat of the original written exam.

The longitudinal assessment, which replaced the traditional ten-year high-stakes exam in 2021, works very differently from the Part I exam: it's untimed, open-book, and article-based, drawing 15 questions from three of nine assessment areas each year. The passing requirement is 80%, with a second attempt available before the end-of-July deadline. Availability runs May through July annually, costs $230 per year, and newly certified diplomates get one full calendar year before participation is required. Note that the nine renewal-assessment areas are distinct from the ten initial written-exam domains - they are not the same list, so studying for OCC renewal is not the same task as studying for Part I.

For candidates still working toward initial certification, understanding how the exam fits into a broader career and compensation picture can also inform how much preparation investment makes sense - the Orthopedic Surgery Salary Guide 2026 and the ROI analysis on certification value both address that angle directly. If you're still assessing how demanding the exam is relative to your residency training, the difficulty guide and a run through practice questions on the practice exam site are good next steps before committing to a specific test date.

Frequently Asked Questions