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      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>2507371</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>2139073</DepreciationAmt>
        <BookValueAmt>368298</BookValueAmt>
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      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>1023116</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>678732</DepreciationAmt>
        <BookValueAmt>344384</BookValueAmt>
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      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>4582221</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>3323749</DepreciationAmt>
        <BookValueAmt>1258472</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>2206566</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>Federal Income Taxes</Desc>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>DEFERRED COMPENSATION</Desc>
        <Amt>269531</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>269531</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>22509678</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>3888980</NetUnrealizedGainsInvstAmt>
      <DonatedServicesAndUseFcltsAmt>7053600</DonatedServicesAndUseFcltsAmt>
      <OtherRevenueAmt>0</OtherRevenueAmt>
      <RevenueNotReportedAmt>10942580</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>11567098</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>136479</InvestmentExpensesNotIncldAmt>
      <OtherRevenuesNotIncludedAmt>0</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>136479</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>11703577</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>19914096</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>7053600</DonatedServicesUseFcltsAmt>
      <OtherExpensesIncludedAmt>0</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>7053600</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>12860496</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>136479</InvestmentExpensesNotIncld2Amt>
      <OtherExpensesNotIncludedAmt>0</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>136479</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>12996975</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part X, Line 2 FIN 48 (ASC 740) footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD IS EXEMPT FROM THE PAYMENT OF INCOME TAXES ON ITS EXEMPT ACTIVITIES UNDER SECTION 501(C)(6) OF THE INTERNAL REVENUE CODE. THE BOARD'S TAX RETURNS ARE SUBJECT TO REVIEW AND EXAMINATION BY FEDERAL, STATE, AND LOCAL AUTHORITIES. THE BOARD HAS EVALUATED ITS TAX POSITIONS AND DETERMINED THAT ITS POSITIONS ARE MORE LIKELY THAN NOT TO BE SUSTAINED ON EXAMINATION.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="IRS990ScheduleJ" softwareId="24020961" softwareVersionNum="2024v5.1">
      <FirstClassOrCharterTravelInd>X</FirstClassOrCharterTravelInd>
      <TravelForCompanionsInd>X</TravelForCompanionsInd>
      <IdemnificationGrossUpPmtsInd>X</IdemnificationGrossUpPmtsInd>
      <WrittenPolicyRefTAndEExpnssInd>true</WrittenPolicyRefTAndEExpnssInd>
      <SubstantiationRequiredInd>true</SubstantiationRequiredInd>
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
      <WrittenEmploymentContractInd>X</WrittenEmploymentContractInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>false</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DAVID F MARTIN MD</PersonNm>
        <TitleTxt>EXECUTIVE DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>628257</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>1860</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>8237</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>92000</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>36909</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>767263</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MICHAEL S BEDNAR MD</PersonNm>
        <TitleTxt>ASSOCIATE EXECUTIVE DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>313715</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>1860</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>1620</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>317195</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KATHRYN CLARK</PersonNm>
        <TitleTxt>MANAGER, FINANCE &amp; HR</TitleTxt>
        <BaseCompensationFilingOrgAmt>137000</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>7685</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>681</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>29792</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>40603</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>215761</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DENISE F FRAZIER</PersonNm>
        <TitleTxt>MANAGER, CERTIFICATES &amp; CREDENTIALS</TitleTxt>
        <BaseCompensationFilingOrgAmt>126000</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>7385</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>1368</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>27500</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>22108</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>184361</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DAVID SHEPHARD</PersonNm>
        <TitleTxt>IT MANAGER</TitleTxt>
        <BaseCompensationFilingOrgAmt>126000</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>6633</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>1745</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>27250</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>36723</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>198351</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DAVID ELSTEIN</PersonNm>
        <TitleTxt>MANAGER, EDUCATION &amp; COMMUNICATION</TitleTxt>
        <BaseCompensationFilingOrgAmt>114500</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>7685</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>216</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>25104</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>31981</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>179486</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KRISTIN CABA</PersonNm>
        <TitleTxt>MANAGER, ASSESSMENT DEVELOPMENT &amp; ADMINISTRATION</TitleTxt>
        <BaseCompensationFilingOrgAmt>114501</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>7664</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>202</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>25104</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>33951</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>181422</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a First-class or charter travel</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAY HAVE INSTANCES WHEN FIRST-CLASS TRAVEL IS NECESSARY FOR CONDUCTING ORGANIZATION BUSINESS. FIRST CLASS TRAVEL BY THE ABOS DIRECTORS IS RARELY USED AND ONLY FOR LONG DISTANCE TRAVEL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a Travel for companions</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS OF THE GOVERNING BODY HAVE THE ABILITY TO INCLUDE A SPOUSE TO TRAVEL WITH THEM FOR VARIOUS ORGANIZATION BUSINESS MEETINGS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a Tax indemnification and gross-up payments</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AMOUNTS FOR SPOUSAL TRAVEL ARE DEEMED GROSS-UP PAYMENTS AND INCLUDED IN THE TAXABLE INCOME OF THE APPROPRIATE INDIVIDUALS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="24020961" softwareVersionNum="2024v5.1">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 1a Delegate broad authority to a committee</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE COMMITTEE CONSISTS OF THE FOLLOWING BOARD MEMBERS: THE PRESIDENT AS CHAIR, THE IMMEDIATE PAST-PRESIDENT, PRESIDENT-ELECT, SECRETARY, AND TREASURER. THE EXECUTIVE DIRECTOR SERVES AN EX-OFFICIO MEMBER WITHOUT VOTE. THE EXECUTIVE COMMITTEE HAS THE AUTHORITY TO CARRY OUT THE BUSINESS AND FUNCTIONS OF THE ORGANIZATION BETWEEN MEETINGS OF THE BOARD AND REPORTS ANY SUCH ACTIONS TO THE BOARD FOR RATIFICATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b Review of form 990 by governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION CONTRACTS WITH A PUBLIC ACCOUNTING FIRM TO PREPARE THE FORM 990 BASED ON INFORMATION OBTAINED FROM MANAGEMENT AND DURING THE FINANCIAL AUDIT. ONCE THE DRAFT IS AVAILABLE, IT IS REVIEWED BY THE EXECUTIVE DIRECTOR, THE FINANCE MANAGER, AND THE TREASURER. THE FORM 990 IS THEN PROVIDED TO THE GOVERNING BODY PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c Conflict of interest policy</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL AMERICAN BOARD OF ORTHOPAEDIC SURGERY (ABOS) DIRECTORS AND THE EXECUTIVE DIRECTOR ARE COVERED BY CONFLICT-OF-INTEREST POLICY. THE EXECUTIVE DIRECTOR AND THE EXECUTIVE COMMITTEE REVIEW THE FORMS. EACH DIRECTOR AND THE EXECUTIVE DIRECTOR MUST FILL OUT A FORM ANNUALLY AND ARE OBLIGED TO REPORT SIGNIFICANT CHANGES TO THE ABOS STAFF IN WRITING. THE FORMS ARE STORED ON A PASSWORD PROTECTED LOCATION ON THE ABOS WEBSITE THAT IS AVAILABLE FOR ALL THE DIRECTORS. THE PERSON WHO IS CONFLICTED IS EXCUSED FROM DISCUSSIONS AND DECISIONS CONCERNING THE CONFLICTED PARTY. ANY CONFLICT WILL BE DOCUMENTED IN THE MEETING MINUTES OF THE FULL BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a Process to establish compensation of top management official</FormAndLineReferenceDesc>
        <ExplanationTxt>EXECUTIVE DIRECTOR SALARY BENCHMARK DATA FROM NATIONAL AAMC MEDIAN FOR PROFESSOR AND MEDIAN FOR CHAIR AVERAGED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19 Required documents available to the public</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g Other Fees</FormAndLineReferenceDesc>
        <ExplanationTxt>WEB CONSULTING - Total Expense: 1851803, Program Service Expense: , Management and General Expenses: , Fundraising Expenses: ; PROFESSIONAL FEES - Total Expense: 464192, Program Service Expense: , Management and General Expenses: , Fundraising Expenses: ;</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>