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      <GrantsToDomesticOrgs>
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        <ProgramServices>85869</ProgramServices>
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        <ManagementAndGeneral>2029331</ManagementAndGeneral>
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        <ProgramServices>249551</ProgramServices>
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        <ProgramServices>581681</ProgramServices>
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        <ProgramServices>514567</ProgramServices>
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        <ManagementAndGeneral>165284</ManagementAndGeneral>
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        <ManagementAndGeneral>127103</ManagementAndGeneral>
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        <ProgramServices>2250007</ProgramServices>
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        <Total>5758423</Total>
        <ProgramServices>5536978</ProgramServices>
        <ManagementAndGeneral>221445</ManagementAndGeneral>
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        <Total>1473343</Total>
        <ProgramServices>1104647</ProgramServices>
        <ManagementAndGeneral>368696</ManagementAndGeneral>
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        <ProgramServices>50003</ProgramServices>
        <ManagementAndGeneral>94742</ManagementAndGeneral>
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        <ManagementAndGeneral>88273</ManagementAndGeneral>
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      <OtherExpenses>
        <Description>PRINTING AND PUBLICATIO</Description>
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        <ProgramServices>516868</ProgramServices>
        <ManagementAndGeneral>124133</ManagementAndGeneral>
        <Fundraising>500</Fundraising>
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      <OtherExpenses>
        <Description>UNRELATED BUSINESS INCO</Description>
        <Total>165591</Total>
        <ProgramServices>125799</ProgramServices>
        <ManagementAndGeneral>39792</ManagementAndGeneral>
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      <AllOtherExpenses>
        <Total>317953</Total>
        <ProgramServices>40139</ProgramServices>
        <ManagementAndGeneral>277814</ManagementAndGeneral>
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      <TotalFunctionalExpenses>
        <Total>37438928</Total>
        <ProgramServices>25929416</ProgramServices>
        <ManagementAndGeneral>11441837</ManagementAndGeneral>
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        <EOY>12017526</EOY>
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        <EOY>59919841</EOY>
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        <EOY>400130</EOY>
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        <EOY>1876992</EOY>
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        <EOY>75051797</EOY>
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        <FinancialStatementConsolidated>X</FinancialStatementConsolidated>
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        <CurrentTaxYearMinus1Year>11872900</CurrentTaxYearMinus1Year>
        <CurrentTaxYear>12256942</CurrentTaxYear>
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        <CurrentTaxYearMinus1Year>9250000</CurrentTaxYearMinus1Year>
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        <CurrentTaxYearMinus1Year>9250000</CurrentTaxYearMinus1Year>
        <CurrentTaxYear>9750000</CurrentTaxYear>
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        <CurrentTaxYearMinus1Year>4088558</CurrentTaxYearMinus1Year>
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      <FootnoteInPartXIII>X</FootnoteInPartXIII>
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        <ReturnReference>PART V, LINE 4:</ReturnReference>
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          <State>TN</State>
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        <TotalCompensationFilingOrg>181824</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>HOWARD MEVIS</NamePerson>
        <Title>DIRECTOR OF ELEC MEDIA, EVAL, COURSE</Title>
        <BaseCompensationFilingOrg>204325</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>3885</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>6803</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>20432</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>10912</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>246357</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>SANDRA GORDON</NamePerson>
        <Title>DIRECTOR OF PUBLIC RELATIONS</Title>
        <BaseCompensationFilingOrg>179287</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>5723</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>3840</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>17929</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>10912</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>217691</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>JAMES OGLE</NamePerson>
        <Title>DIRECTOR OF INFORMATION SERVICES</Title>
        <BaseCompensationFilingOrg>179153</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>3469</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>4487</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>17915</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>10912</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>215936</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>LEWIS JENKINS</NamePerson>
        <Title>DIRECTOR OF MARKETING</Title>
        <BaseCompensationFilingOrg>154454</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>5147</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>2397</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>15445</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>10912</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>188355</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>SUSAN MCSORLEY</NamePerson>
        <Title>DIRECTOR OF CONVENTION AND MEETING S</Title>
        <BaseCompensationFilingOrg>157334</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>3195</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>3828</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>15733</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>10912</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>191002</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>LYNNE DOWLING</NamePerson>
        <Title>DIRECTOR OF INTERNATIONAL</Title>
        <BaseCompensationFilingOrg>149626</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>2891</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>4920</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>14963</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>10912</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>183312</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>MARITA POWELL</NamePerson>
        <Title>DIRECTOR OF HUMAN RESOURCES</Title>
        <BaseCompensationFilingOrg>151745</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>2986</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>2060</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>15175</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>10912</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>182878</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>JENNIFER JONES</NamePerson>
        <Title>DIRECTOR OF SOCIETY RELATIONS</Title>
        <BaseCompensationFilingOrg>150338</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>2198</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>3291</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>15034</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>10912</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>181773</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>JEFFREY KRAMER</NamePerson>
        <Title>DIRECTOR OF EDUCATIONAL PROGRAMS</Title>
        <BaseCompensationFilingOrg>142851</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>2492</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>2711</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>14285</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>10912</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>173251</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>MARILYN FOX</NamePerson>
        <Title>DIRECTOR OF PUBLICATIONS (FORMER)</Title>
        <BaseCompensationFilingOrg>139401</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>3221</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>2791</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>13940</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>10912</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>170265</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartIII>
        <ReturnReference>PART I, LINE 1A</ReturnReference>
        <Explanation>AIRFARE ONE CLASS UP FROM COACH IS AVAILABLE TO THE PRESIDENTIAL LINE FOR ALL AAOS ACTIVITIES, HOWEVER, NO PEOPLE RECEIVED THIS BENEFIT IN 2012. AIRFARE ONCE CLASS UP FROM COACH IS AVAILABLE TO THE BOARD OF DIRECTORS FOR ALL BOARD-RELATED ACTIVITIES AND 10 PEOPLE RECEIVED THIS BENEFIT IN 2012. TRAVEL FOR COMPANIONS IS AVAILABLE TO THE BOARD OF DIRECTORS AND EXECUTIVE TEAM MEMBERS (CEO, COO/CFO, CHIEF EDUCATION OFFICER, MEDICAL DIRECTOR, AND GENERAL COUNSEL) AND THE AMOUNT OF COMPANION TRAVEL WAS TREATED AS TAXABLE COMPENSATION TO ALL WHO RECEIVED THIS BENEFIT (1 PERSON IN 2012). THE BOARD OF DIRECTORS RECEIVES GROSS-UP PAYMENTS FOR THIS COMPENSATION AND THAT IS ALSO TREATED AS TAXABLE COMPENSATION (18 PEOPLE IN 2012).</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <ReturnReference>PART I, LINE 4B</ReturnReference>
        <Explanation>KAREN HACKETT, CHIEF EXECUTIVE OFFICER, ACCRUED A 457F SUPPLEMENTAL RETIREMENT PAYMENT OF $16,500, WHICH IS INCLUDED IN SCHEDULE J, PART II DEFERRED COMPENSATION.</Explanation>
      </Form990ScheduleJPartIII>
    </IRS990ScheduleJ>
    <IRS990ScheduleL documentId="RetDoc1042800001">
      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>ANDREW N POLLAK MD</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>BOARD MEMBER</Relationship>
        <AmountOfTransaction>139717</AmountOfTransaction>
        <DescriptionOfTransaction>THE BOARD MEMBER IS THE EDITOR OF ONE OF THE ACADEMY'S PRODUCT LINES. HIS COMPANY RECEIVES A ROYALTY BASED ON A PERCENTAGE OF THE SALES ASSOCIATED WITH THAT PRODUCT LINE.</DescriptionOfTransaction>
        <SharingOfRevenues>1</SharingOfRevenues>
      </Form990ScheduleLPartIV>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION A, LINE 6</ReturnReference>
        <Explanation>AS A MEMBERSHIP ASSOCIATION, THE ORGANIZATION CURRENTLY HAS 36,945 MEMBERS. ALL FELLOWS AND MEMBERS OF THE AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS (ACADEMY), SHALL ALSO BE CONSIDERED FELLOWS AND MEMBERS OF THE SAME CLASSIFICATION OF THE AMERICAN ASSOCIATION OF ORTHOPAEDIC SURGEONS (ASSOCIATION), A RELATED ORGANIZATION. THERE ARE TWO CATEGORIES OF MEMBERSHIP IN THE ACADEMY AND THE ASSOCIATION: FELLOWS AND MEMBERS. ONLY FELLOWS SHALL HAVE THE RIGHT TO VOTE AND HOLD OFFICE.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION A, LINE 7A</ReturnReference>
        <Explanation>ELECTIONS OF THE OFFICERS AND THE AT-LARGE MEMBERS OF THE ASSOCIATION AND ACADEMY BOARD OF DIRECTORS SHALL BE DETERMINED BY THE ADOPTION OF THE REPORT OF THE NOMINATING COMMITTEE OR BY THE VOICE, WRITTEN, OR ELECTRONIC BALLOT OF THOSE FELLOWS PRESENT AT THE BUSINESS MEETING OF THE ANNUAL MEETING. EACH FELLOW WHO IS PRESENT AT THE BUSINESS MEETING OF THE ANNUAL MEETING SHALL BE ENTITLED TO ONE (1) VOTE FOR EACH OFFICER OF THE ASSOCIATION AND ACADEMY, MEMBER OF THE BOARD OF DIRECTORS, MEMBER OF THE MEMBERSHIP COMMITTEE, AND NOMINEES TO THE AMERICAN BOARD OF ORTHOPAEDIC SURGERY TO BE ELECTED. THOSE INDIVIDUALS RECEIVING THE GREATEST NUMBER OF VOTES SHALL BE CONSIDERED ELECTED, EVEN IF THEY DO NOT RECEIVE A MAJORITY OF THE VOTES CAST.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 11</ReturnReference>
        <Explanation>THE BOARD RETAINS THE SERVICES OF AN INDEPENDENT CPA FIRM TO PREPARE THE ORGANIZATION'S FORM 990. MANAGEMENT REVIEWS THE COMPLETED FORM 990 AND PROVIDES A FULL COPY TO ALL VOTING MEMBERS OF THE GOVERNING BODY PRIOR TO FILING. A CONFERENCE CALL IS SCHEDULED FOR THE CPA FIRM AND ORGANIZATION MANAGEMENT TO DISCUSS THE FORM 990 WITH THE FINANCE COMMITTEE AND TO ANSWER ANY QUESTIONS PRIOR TO FILING FORM 990 WITH THE IRS. THE FINANCE COMMITTEE HAS BEEN DELEGATED THE AUTHORITY TO REVIEW AND APPROVE THE FORM 990 BY THE VOTING MEMBERS OF THE GOVERNING BODY.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 12C</ReturnReference>
        <Explanation>BOARD MEMBERS, KEY VOLUNTEERS, AND KEY STAFF ARE NOTIFIED IN WRITING TWICE A YEAR TO UPDATE THEIR WRITTEN DISCLOSURES. THE DISCLOSURE DATABASE IS MAINTAINED ELECTRONICALLY AND ANYONE WHO HAS NOT UPDATED THEIR RECORD IS NOTIFIED UNTIL THEY HAVE DONE SO. ADDITIONALLY, BEFORE EVERY BOARD AND COMMITTEE MEETING PARTICIPANTS ARE ASKED IF THEY HAVE ANYTHING NEW TO DISCLOSE.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 15</ReturnReference>
        <Explanation>A COMPENSATION COMMITTEE IS DESIGNATED BY THE VOTING MEMBERS OF THE GOVERNING BODY AND IS CHARGED WITH DEVELOPING AND NEGOTIATING THE TERMS OF EMPLOYMENT AND ESTABLISHING THE TOTAL COMPENSATION PACKAGE FOR DESIGNATED POSITIONS. AN EVALUATION PROCESS IS COMPLETED ANNUALLY AND A RECOMMENDATION IS MADE REGARDING COMPENSATION THAT IS SENT TO THE BOARD FOR APPROVAL. THIS PROCESS INCLUDES THE CHIEF EXECUTIVE OFFICER, CHIEF OPERATING OFFICER/CHIEF FINANCIAL OFFICER, CHIEF EDUCATION OFFICER, MEDICAL DIRECTOR, AND GENERAL COUNSEL.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION C, LINE 19</ReturnReference>
        <Explanation>GOVERNING DOCUMENTS AND THE CONFLICT OF INTEREST POLICY ARE AVAILABLE ON THE ORGANIZATION'S WEBSITE WHICH IS OPEN TO THE PUBLIC. FINANCIAL STATEMENTS ARE AVAILABLE THROUGH THE APPLICABLE GOVERNMENTAL AGENCIES.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART XII, LINE 2C</ReturnReference>
        <Explanation>THIS PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>AMERICAN ASSOCIATION OF ORTHOPAEDIC SURGEONS</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
        </AddressUS>
        <EIN>364241052</EIN>
        <PrimaryActivities>ADVOCACY ACTIVITIES ON BEHALF OF PATIENTS AND PROFESSIONALS</PrimaryActivities>
        <LegalDomicileState>IL</LegalDomicileState>
        <ExemptCodeSection>501(C)(6)</ExemptCodeSection>
        <DirectControllingEntityNA>N/A</DirectControllingEntityNA>
        <ControlledOrg>0</ControlledOrg>
      </Form990ScheduleRPartII>
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>CENTER FOR ORTHOPAEDIC ADVANCEMENT NFP</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
        </AddressUS>
        <EIN>263164922</EIN>
        <PrimaryActivities>SUPPORT EDUCATIONAL ACTIVITIES OF AAOS</PrimaryActivities>
        <LegalDomicileState>IL</LegalDomicileState>
        <ExemptCodeSection>501(C)(3)</ExemptCodeSection>
        <PublicCharityStatus>LINE 11A, I</PublicCharityStatus>
        <DirectControllingEntityNA>N/A</DirectControllingEntityNA>
        <ControlledOrg>0</ControlledOrg>
      </Form990ScheduleRPartII>
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>AMERICAN JOINT REPLACEMENT REGISTRY NFP</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
        </AddressUS>
        <EIN>270645591</EIN>
        <PrimaryActivities>FOSTER A NATIONAL CENTER FOR DATA COLLECTION ON JOINT REPLACEMENTS</PrimaryActivities>
        <LegalDomicileState>IL</LegalDomicileState>
        <ExemptCodeSection>501(C)(3)</ExemptCodeSection>
        <PublicCharityStatus>LINE 11A, I</PublicCharityStatus>
        <DirectControllingEntityNA>N/A</DirectControllingEntityNA>
        <ControlledOrg>0</ControlledOrg>
      </Form990ScheduleRPartII>
      <ReceiptOfIntAnnRentsRoyalties>0</ReceiptOfIntAnnRentsRoyalties>
      <GiftGrantOrCapContrToOtherOrg>1</GiftGrantOrCapContrToOtherOrg>
      <GiftGrantOrCapContrFrOtherOrg>1</GiftGrantOrCapContrFrOtherOrg>
      <LoansOrGuaranteesToOtherOrg>0</LoansOrGuaranteesToOtherOrg>
      <LoansOrGuaranteesFromOtherOrg>0</LoansOrGuaranteesFromOtherOrg>
      <DividendsRelatedOrganization>0</DividendsRelatedOrganization>
      <SaleOfAssetsToOtherOrg>0</SaleOfAssetsToOtherOrg>
      <PurchaseOfAssetsFromOtherOrg>0</PurchaseOfAssetsFromOtherOrg>
      <ExchangeOfAssets>0</ExchangeOfAssets>
      <RentalOfFacilitiesToOtherOrgs>0</RentalOfFacilitiesToOtherOrgs>
      <RentalOfFacilitiesFrOtherOrgs>0</RentalOfFacilitiesFrOtherOrgs>
      <PerformOfServicesForOtherOrgs>1</PerformOfServicesForOtherOrgs>
      <PerformOfServicesByOtherOrgs>0</PerformOfServicesByOtherOrgs>
      <SharingOfFacilities>1</SharingOfFacilities>
      <SharingOfPaidEmployees>1</SharingOfPaidEmployees>
      <ReimbursementPaidToOtherOrg>0</ReimbursementPaidToOtherOrg>
      <ReimbursementPaidByOtherOrg>1</ReimbursementPaidByOtherOrg>
      <OtherTransferToOtherOrg>0</OtherTransferToOtherOrg>
      <OtherTransferFromOtherOrg>0</OtherTransferFromOtherOrg>
      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>AMERICAN ASSOCIATION OF ORTHOPAEDIC SURGEONS</BusinessNameLine1>
        </NameOfOtherOrganization>
        <TransactionType>C</TransactionType>
        <AmountInvolved>9750000</AmountInvolved>
        <MethodOfAmtDetermination>COST</MethodOfAmtDetermination>
      </TransactionsRelatedOrgsTable>
      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>AMERICAN ASSOCIATION OF ORTHOPAEDIC SURGEONS</BusinessNameLine1>
        </NameOfOtherOrganization>
        <TransactionType>Q</TransactionType>
        <AmountInvolved>3728955</AmountInvolved>
        <MethodOfAmtDetermination>COST</MethodOfAmtDetermination>
      </TransactionsRelatedOrgsTable>
    </IRS990ScheduleR>
  </ReturnData>
</Return>