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        <AverageHoursPerWeekRltdOrgRt>0.50</AverageHoursPerWeekRltdOrgRt>
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        <ReportableCompFromRltdOrgAmt>266952</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>52584</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>ELLEN KAIMAKIS</PersonNm>
        <TitleTxt>LAB MANAGER</TitleTxt>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <ReportableCompFromRltdOrgAmt>118115</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>10428</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KLABACHA KATHRYN</PersonNm>
        <TitleTxt>OFFICE MANAGER</TitleTxt>
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      <TotReportableCompRltdOrgAmt>740776</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>83266</TotalOtherCompensationAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>RENTAL INCOME</Desc>
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      <ProgramServiceRevenueGrp>
        <Desc>OTHER REVENUE</Desc>
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      <PensionPlanContributionsGrp>
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        <ManagementAndGeneralAmt>9366</ManagementAndGeneralAmt>
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      <OtherEmployeeBenefitsGrp>
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      <FeesForServicesAccountingGrp>
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        <ManagementAndGeneralAmt>18359</ManagementAndGeneralAmt>
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      <FeesForServicesOtherGrp>
        <TotalAmt>469520</TotalAmt>
        <ProgramServicesAmt>447773</ProgramServicesAmt>
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      <AdvertisingGrp>
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        <ProgramServicesAmt>70049</ProgramServicesAmt>
        <ManagementAndGeneralAmt>500</ManagementAndGeneralAmt>
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      <OfficeExpensesGrp>
        <TotalAmt>116293</TotalAmt>
        <ProgramServicesAmt>86620</ProgramServicesAmt>
        <ManagementAndGeneralAmt>29673</ManagementAndGeneralAmt>
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      <InformationTechnologyGrp>
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        <ProgramServicesAmt>54720</ProgramServicesAmt>
        <ManagementAndGeneralAmt>17280</ManagementAndGeneralAmt>
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      <OccupancyGrp>
        <TotalAmt>1190441</TotalAmt>
        <ProgramServicesAmt>904735</ProgramServicesAmt>
        <ManagementAndGeneralAmt>285706</ManagementAndGeneralAmt>
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      <TravelGrp>
        <TotalAmt>55665</TotalAmt>
        <ProgramServicesAmt>26823</ProgramServicesAmt>
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      <ConferencesMeetingsGrp>
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      <DepreciationDepletionGrp>
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      <InsuranceGrp>
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        <ProgramServicesAmt>8000</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>SPECIMEN EXPENSES</Desc>
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        <ProgramServicesAmt>1043571</ProgramServicesAmt>
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      <AllOtherExpensesGrp>
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      <TotalFunctionalExpensesGrp>
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        <ProgramServicesAmt>3542122</ProgramServicesAmt>
        <ManagementAndGeneralAmt>737097</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
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      <SavingsAndTempCashInvstGrp>
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        <EOYAmt>1032666</EOYAmt>
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      <AccountsReceivableGrp>
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        <EOYAmt>92377</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
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        <EOYAmt>1672</EOYAmt>
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      <LandBldgEquipBasisNetGrp>
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        <EOYAmt>791162</EOYAmt>
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        <EOYAmt>1458906</EOYAmt>
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      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
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        <EOYAmt>7333675</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>7474887</BOYAmt>
        <EOYAmt>7333675</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>10574596</BOYAmt>
        <EOYAmt>8792581</EOYAmt>
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      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
      <ReconcilationRevenueExpnssAmt>-195883</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>54671</OtherChangesInNetAssetsAmt>
      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleA documentId="RetDoc1039100001">
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      <SupportingOrgType3FuncIntInd>X</SupportingOrgType3FuncIntInd>
      <SupportedOrganizationsCnt>1</SupportedOrganizationsCnt>
      <SupportedOrgInformationGrp>
        <SupportedOrganizationName>
          <BusinessNameLine1Txt>AMERICAN ACADEMY OF ORTHOPEDIC SURGEONS</BusinessNameLine1Txt>
        </SupportedOrganizationName>
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        <OrganizationTypeCd>10</OrganizationTypeCd>
        <GoverningDocumentListedInd>1</GoverningDocumentListedInd>
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        <OtherSupportAmt>0</OtherSupportAmt>
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      <SupportedOrganizationsTotalCnt>1</SupportedOrganizationsTotalCnt>
      <SupportSumAmt>0</SupportSumAmt>
      <OtherSupportSumAmt>0</OtherSupportSumAmt>
      <Form990SchASupportingOrgGrp>
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        <SuprtOrgNoIRSDeterminationInd>0</SuprtOrgNoIRSDeterminationInd>
        <SupportedOrgSectionC456Ind>0</SupportedOrgSectionC456Ind>
        <SupportedOrgNotOrganizedUSInd>0</SupportedOrgNotOrganizedUSInd>
        <OrganizationChangeSuprtOrgInd>0</OrganizationChangeSuprtOrgInd>
        <SupportNonSupportedOrgInd>0</SupportNonSupportedOrgInd>
        <PaymentSubstantialContribtrInd>0</PaymentSubstantialContribtrInd>
        <LoanDisqualifiedPersonInd>0</LoanDisqualifiedPersonInd>
        <ControlledDisqualifiedPrsnInd>0</ControlledDisqualifiedPrsnInd>
        <DisqualifiedPrsnControllIntInd>0</DisqualifiedPrsnControllIntInd>
        <DisqualifiedPrsnOwnrIntInd>0</DisqualifiedPrsnOwnrIntInd>
        <ExcessBusinessHoldingsRulesInd>0</ExcessBusinessHoldingsRulesInd>
        <ContributionControllerInd>0</ContributionControllerInd>
        <ContributionFamilyInd>0</ContributionFamilyInd>
        <Contribution35ControlledInd>0</Contribution35ControlledInd>
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      <Form990SchAType3SprtOrgAllGrp>
        <TimelyProvidedDocumentsInd>1</TimelyProvidedDocumentsInd>
        <OfficersCloseRelationshipInd>1</OfficersCloseRelationshipInd>
        <SupportedOrgVoiceInvestmentInd>1</SupportedOrgVoiceInvestmentInd>
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      <Form990SchAType3FuncIntGrp>
        <ActivitiesTestInd>X</ActivitiesTestInd>
        <ActivitiesFurtherExemptPrpsInd>1</ActivitiesFurtherExemptPrpsInd>
        <ActivitiesEngagedOrgInvlmntInd>1</ActivitiesEngagedOrgInvlmntInd>
      </Form990SchAType3FuncIntGrp>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>PART IV, SECTION D, LINE 3:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AMERICAN ACADEMY OF ORTHOPEDIC SURGEONS IS THE SUPPORTED ORGANIZATION. THEIR MISSION IS TO PROVIDE MEDICAL EDUCATION TO THEIR MEMBERS. THE ORTHOPAEDIC LEARNING CENTER PROVIDES ORGANIZATIONS WITH THE EDUCATIONAL FACILITY TO PRESENT THEIR EDUCATIONAL PROGRAMS. THE SUPPORTED ORGANIZATIONS ARE REPRESENTED ON THE OLC BOARD OF DIRECTORS WHICH IS OUTLINED IN THE OLC BYLAWS.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>PART IV, SECTION E, LINE 2A:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORTHOPEDIC LEARNING CENTER PROVIDES EDUCATIONAL AND TRAINING FACILITIES FOR USE BY ITS SUPPORTED ORGANIZATIONS WHICH FURTHERS THE EXEMPT PURPOSES OF THE SUPPORTED ORGANIZATION.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>PART IV, SECTION E, LINE 2B:</FormAndLineReferenceDesc>
        <ExplanationTxt>IF NOT ENGAGED WITH THE ORTHOPEDIC LEARNING CENTER, THE SUPPORTED ORGANIATION WOULD FIND OTHER EDUCATIONAL AND TRAINING FACILITIES TO FURTHER THEIR EXEMPT PURPOSES.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>1662209</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1455837</DepreciationAmt>
        <BookValueAmt>206372</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>5680707</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>5103764</DepreciationAmt>
        <BookValueAmt>576943</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>59688</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>51841</DepreciationAmt>
        <BookValueAmt>7847</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>791162</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>INVESTMENT IN ORTHO PROPERTIES</Desc>
        <BookValueAmt>5858474</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>ROU ASSET</Desc>
        <BookValueAmt>1016230</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>6874704</TotalBookValueOtherAssetsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>LEASE LIABILITY</Desc>
        <Amt>1205530</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>1205530</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CENTER'S APPLICATION OF ACCOUNTING PRINCIPLES GENERALLY ACCEPTED IN THE UNITED STATES OF AMERICA REGARDING UNCERTAIN TAX POSITIONS HAS NO EFFECT ON ITS FINANCIAL POSITION AS MANAGEMENT BELIEVES THE CENTER HAS NO MATERIAL UNRECOGNIZED INCOME TAX BENEFITS, INCLUDING ANY POTENTIAL RISK OF LOSS OF THEIR NONPROFIT TAX STATUS, THEREFORE, NO LIABILITY RELATING TO UNCERTAIN TAX POSITIONS HAS BEEN RECORDED AS OF DECEMBER 31, 2022. THE CENTER WOULD ACCOUNT FOR ANY POTENTIAL INTEREST OR PENALTIES RELATED TO POSSIBLE FUTURE LIABILITIES FOR UNRECOGNIZED INCOME TAX BENEFITS AS INCOME TAX EXPENSE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <FirstClassOrCharterTravelInd>X</FirstClassOrCharterTravelInd>
      <TravelForCompanionsInd>X</TravelForCompanionsInd>
      <WrittenPolicyRefTAndEExpnssInd>0</WrittenPolicyRefTAndEExpnssInd>
      <SubstantiationRequiredInd>0</SubstantiationRequiredInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>1</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LISE PUCKORIUS</PersonNm>
        <TitleTxt>CHIEF EXECUTIVE OFFICER</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>256703</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>7477</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>2772</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>25670</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>26914</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>319536</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 7</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CEO SHALL BE ELIGIBLE, BUT NOT ENTITLED, TO RECEIVE AN ANNUAL PERFORMANCE-BASED BONUS OF UP TO TWELVE PERCENT (12%) OF SALARY BASED UPON THE PERFORMANCE OF THE CEO AGAINST THE PERFORMANCE OBJECTIVE TO BE MUTUALLY AGREED UPON BY THE BOARD AND THE CEO AT THE BEGINNING OF EACH YEAR. THE BOARD SHALL DETERMINE THE AMOUNT OF THE PERFORMANCE BONUS, IF ANY, BASED ON THE CEO'S PERFORMANCE AGAINST THE PERFORMANCE OBJECTIVES DESCRIBED ABOVE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS MEMBERS THAT ARE IDENTICAL TO THE MEMBERSHIP OF THE SPONSORING ORGANIZATION (THE AMERICAN ACADEMY OF SURGEONS).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>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. THE CHAIR OF THE GOVERNANCE GROUP SHALL ALSO HAVE THE PREROGATIVE OF REQUESTING A PARTICIPANT TO PROVIDE FURTHER INFORMATION OR AN EXPLANATION IF THE CHAIR IDENTIFIES A POTENTIAL CONFLICT OF INTEREST REGARDING THAT PARTICIPANT. THE CHAIR SHALL BE GUIDED BY THE MOST CURRENT VERSION OF THE PROTOCOL FOR THE PRESIDENT TO USE IN HANDLING POTENTIAL CONFLICT OF INTEREST ISSUES BEFORE THE ACADEMY BOARD OF DIRECTORS. BASED ON THE INFORMATION PROVIDED IN THE ACADEMY ORTHOPAEDIC DISCLOSURE PROGRAM AND/OR UPON A FURTHER REVIEW, THE CHAIR OF THE ACADEMY GOVERNANCE GROUP MAY DETERMINE THAT THE PARTICIPANT SHALL: 1) DISCLOSE THE POTENTIAL CONFLICT AND CONTINUE TO PARTICIPATE FULLY IN THE ACADEMY GOVERNANCE GROUP'S DISCUSSIONS AND VOTE; ["DISCLOSURE OPTION"] 2) DISCLOSE THE POTENTIAL CONFLICT, ADDRESS ANY QUESTIONS OTHER MEMBERS OF THE GROUP HAVE ON THE SUBJECT, THEN LEAVE THE ROOM AND NOT PARTICIPATE IN FURTHER DISCUSSION AND VOTE ["RECUSAL FROM VOTE OPTION"] OR 3) DEPART FROM THE ROOM UNTIL THE MATTER HAS BEEN FULLY DISCUSSED AND ACTED UPON. ["RECUSAL FROM DISCUSSION AND VOTE OPTION"].</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>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 THE CEO. AN EVALUATION PROCESS IS COMPLETED ANNUALLY AND A RECOMMENDATION IS MADE REGARDING COMPENSATION THAT IS SENT TO THE BOARD FOR APPROVAL. FOR OTHER OFFICERS, KEY EMPLOYEES, AND STAFF POSITIONS, A MARKET STUDY REVIEW IS PERFORMED EVERY THREE TO FOUR YEARS COMPARING JOB DESCRIPTIONS WITH OTHER ENTITIES TO DETERMINE REASONABLE SALARY RANGES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>FEES FOR SERVICES: PROGRAM SERVICE EXPENSES 447,773. MANAGEMENT AND GENERAL EXPENSES 21,747. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 469,520.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>GAIN (LOSS) ON ORTHO PROPERTIES LLC 54,671.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C</FormAndLineReferenceDesc>
        <ExplanationTxt>THIS PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>9400 W HIGGINGS ROAD</AddressLine1Txt>
          <CityNm>ROSEMONT</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60018</ZIPCd>
        </USAddress>
        <EIN>362110592</EIN>
        <PrimaryActivitiesTxt>EDUCATION</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>10</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>ORTHOPAEDIC LEARNING CENTER FOUNDATION</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>9400 W HIGGINGS ROAD</AddressLine1Txt>
          <CityNm>ROSEMONT</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60018</ZIPCd>
        </USAddress>
        <EIN>812223822</EIN>
        <PrimaryActivitiesTxt>EDUCATION</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>7</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>OLC</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>ORTHO PROPERTIES LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>9400 W HIGGINGS ROAD</AddressLine1Txt>
          <CityNm>ROSEMONT</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60018</ZIPCd>
        </USAddress>
        <EIN>320402949</EIN>
        <PrimaryActivitiesTxt>COMMERCIAL</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>AAOS</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <DisproportionateAllocationsInd>0</DisproportionateAllocationsInd>
        <GeneralOrManagingPartnerInd>0</GeneralOrManagingPartnerInd>
      </IdRelatedOrgTxblPartnershipGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>