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        <PersonNm>MATTHEW B DOBBS MD</PersonNm>
        <TitleTxt>MEMBER-AT-LARGE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>WILLIAM J BEST</PersonNm>
        <TitleTxt>LAY MEMBER</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KAREN L HACKETT</PersonNm>
        <TitleTxt>CHIEF EXECUTIVE OFFICER</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>RICHARD J STEWART</PersonNm>
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        <AverageHoursPerWeekRltdOrgRt>30.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>RICHARD N PETERSON</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BILL BRUCE</PersonNm>
        <TitleTxt>CHIEF TECHNOLOGY OFFICER</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CONSTANCE FILLING</PersonNm>
        <TitleTxt>CHIEF EDUCATION OFFICER</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>10.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>HOWARD MEVIS</PersonNm>
        <TitleTxt>DIRECTOR OF ELEC MEDIA, EV</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>10.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SANDRA GORDON</PersonNm>
        <TitleTxt>DIRECTOR OF PUBLIC RELATIO</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>10.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JAMES OGLE</PersonNm>
        <TitleTxt>DIRECTOR OF INFORMATION SE</TitleTxt>
        <AverageHoursPerWeekRt>25.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>25.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SUSAN MCSORLEY</PersonNm>
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        <AverageHoursPerWeekRltdOrgRt>5.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>HANS KOELSCH</PersonNm>
        <TitleTxt>DIRECTOR OF PUBLICATIONS</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>10.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>LYNNE DOWLING</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MARITA POWELL</PersonNm>
        <TitleTxt>DIRECTOR OF HUMAN RESOURCE</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>20.00</AverageHoursPerWeekRltdOrgRt>
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        <PersonNm>JENNIFER JONES</PersonNm>
        <TitleTxt>DIRECTOR OF SOCIETY RELATI</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DEBORAH CUMMINS</PersonNm>
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            <BusinessNameLine1>WRIGHT HEEREMA ARCHITECTS</BusinessNameLine1>
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        <ContractorAddress>
          <USAddress>
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            <State>IL</State>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1>ALLIED PRA DESTINATION MANAGEMENT</BusinessNameLine1>
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        <ContractorAddress>
          <USAddress>
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            <State>CA</State>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1>FREEMAN</BusinessNameLine1>
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        <ContractorAddress>
          <USAddress>
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            <State>IL</State>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1>AUGUST LANG &amp; HUSAK INC</BusinessNameLine1>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1>4630 MONTGOMERY AVENUE STE 400</AddressLine1>
            <City>BETHESDA</City>
            <State>MD</State>
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        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1>WEBER SHANDWICK</BusinessNameLine1>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1>PO BOX 7247-6593</AddressLine1>
            <City>PHILADELPHIA</City>
            <State>PA</State>
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        </ContractorAddress>
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        <BusinessCd>541900</BusinessCd>
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      <ProgramServiceRevenueGrp>
        <Desc>COURSE EDUCATION</Desc>
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      <ProgramServiceRevenueGrp>
        <Desc>SPECIALTY SOCIETY MANAGEMENT</Desc>
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        <RelatedOrExemptFuncIncomeAmt>2461578</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
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        <UnrelatedBusinessRevenueAmt>1017853</UnrelatedBusinessRevenueAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>RENTAL INCOME FROM ORTHOPAEDIC SO</Desc>
        <BusinessCd>541900</BusinessCd>
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        <ExclusionAmt>1090391</ExclusionAmt>
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        <RelatedOrExemptFuncIncomeAmt>834869</RelatedOrExemptFuncIncomeAmt>
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        <TotalRevenueColumnAmt>727945</TotalRevenueColumnAmt>
        <ExclusionAmt>727945</ExclusionAmt>
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        <ExclusionAmt>2919310</ExclusionAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>288548</TotalRevenueColumnAmt>
        <ExclusionAmt>288548</ExclusionAmt>
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        <TotalRevenueColumnAmt>-1488385</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>-1488385</RelatedOrExemptFuncIncomeAmt>
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      <TotalRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>22831924</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>1533697</UnrelatedBusinessRevenueAmt>
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      <GrantsToDomesticOrgsGrp>
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        <ProgramServicesAmt>2821193</ProgramServicesAmt>
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        <ProgramServicesAmt>87797</ProgramServicesAmt>
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        <ProgramServicesAmt>1697478</ProgramServicesAmt>
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        <ProgramServicesAmt>6496660</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3833596</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>594796</ProgramServicesAmt>
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        <FundraisingAmt>5043</FundraisingAmt>
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        <ManagementAndGeneralAmt>928533</ManagementAndGeneralAmt>
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        <FundraisingAmt>4853</FundraisingAmt>
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        <ProgramServicesAmt>6226</ProgramServicesAmt>
        <ManagementAndGeneralAmt>34902</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>69801</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>216190</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>847192</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>739635</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5436</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>461674</ProgramServicesAmt>
        <ManagementAndGeneralAmt>256810</ManagementAndGeneralAmt>
        <FundraisingAmt>1050</FundraisingAmt>
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        <ProgramServicesAmt>247183</ProgramServicesAmt>
        <ManagementAndGeneralAmt>150375</ManagementAndGeneralAmt>
        <FundraisingAmt>345</FundraisingAmt>
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        <ProgramServicesAmt>573737</ProgramServicesAmt>
        <ManagementAndGeneralAmt>161453</ManagementAndGeneralAmt>
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      <TravelGrp>
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        <ProgramServicesAmt>2040325</ProgramServicesAmt>
        <ManagementAndGeneralAmt>554246</ManagementAndGeneralAmt>
        <FundraisingAmt>9073</FundraisingAmt>
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        <ProgramServicesAmt>5084063</ProgramServicesAmt>
        <ManagementAndGeneralAmt>246799</ManagementAndGeneralAmt>
        <FundraisingAmt>719</FundraisingAmt>
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        <ProgramServicesAmt>1114598</ProgramServicesAmt>
        <ManagementAndGeneralAmt>364827</ManagementAndGeneralAmt>
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      <InsuranceGrp>
        <TotalAmt>155536</TotalAmt>
        <ProgramServicesAmt>49202</ProgramServicesAmt>
        <ManagementAndGeneralAmt>106334</ManagementAndGeneralAmt>
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        <Desc>EQUIPMENT RENTAL</Desc>
        <TotalAmt>2598626</TotalAmt>
        <ProgramServicesAmt>2491486</ProgramServicesAmt>
        <ManagementAndGeneralAmt>107140</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>PRINTING AND PUBLICATIO</Desc>
        <TotalAmt>624016</TotalAmt>
        <ProgramServicesAmt>564811</ProgramServicesAmt>
        <ManagementAndGeneralAmt>55043</ManagementAndGeneralAmt>
        <FundraisingAmt>4162</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>MISCELLANEOUS</Desc>
        <TotalAmt>361501</TotalAmt>
        <ProgramServicesAmt>359391</ProgramServicesAmt>
        <ManagementAndGeneralAmt>-12409</ManagementAndGeneralAmt>
        <FundraisingAmt>14519</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>UNRELATED BUSINESS INCO</Desc>
        <TotalAmt>52139</TotalAmt>
        <ProgramServicesAmt>17837</ProgramServicesAmt>
        <ManagementAndGeneralAmt>34302</ManagementAndGeneralAmt>
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      <TotalFunctionalExpensesGrp>
        <TotalAmt>41283882</TotalAmt>
        <ProgramServicesAmt>30013164</ProgramServicesAmt>
        <ManagementAndGeneralAmt>10920064</ManagementAndGeneralAmt>
        <FundraisingAmt>350654</FundraisingAmt>
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      <SavingsAndTempCashInvstGrp>
        <BOYAmt>12017526</BOYAmt>
        <EOYAmt>13783597</EOYAmt>
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        <BOYAmt>447406</BOYAmt>
        <EOYAmt>1996042</EOYAmt>
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      <AccountsReceivableGrp>
        <BOYAmt>3384825</BOYAmt>
        <EOYAmt>3125043</EOYAmt>
      </AccountsReceivableGrp>
      <InventoriesForSaleOrUseGrp>
        <BOYAmt>763776</BOYAmt>
        <EOYAmt>636802</EOYAmt>
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        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>35000</CashGrantAmt>
        <PurposeOfGrantTxt>GENERAL SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>NORTH DAKOTA ORTHOPAEDIC SOCIETY</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>PO BOX 1198</AddressLine1>
          <City>BISMARK</City>
          <State>ND</State>
          <ZIPCode>58502</ZIPCode>
        </USAddress>
        <RecipientEIN>999999999</RecipientEIN>
        <CashGrantAmt>8000</CashGrantAmt>
        <PurposeOfGrantTxt>STATE SOCIETY ASSISTANCE</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
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        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
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        <RecipientEIN>363832205</RecipientEIN>
        <IRCSectionDesc>501(C)(6)</IRCSectionDesc>
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        <PurposeOfGrantTxt>GENERAL SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>CURE INTERNATIONAL</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>701 BOSLER AVE</AddressLine1>
          <City>LEMOYNE</City>
          <State>PA</State>
          <ZIPCode>17043</ZIPCode>
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        <RecipientEIN>582248383</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
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      <RecipientTable>
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        <RecipientEIN>364470186</RecipientEIN>
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        <PurposeOfGrantTxt>GENERAL SUPPORT</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1>HEALTH VOLUNTEERS OVERSEAS</BusinessNameLine1>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1>1900 L STREET NW STE 310</AddressLine1>
          <City>WASHINGTON</City>
          <State>DC</State>
          <ZIPCode>20036</ZIPCode>
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        <RecipientEIN>521485477</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>5000</CashGrantAmt>
        <PurposeOfGrantTxt>GENERAL SUPPORT</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>6</Total501c3OrgCnt>
      <TotalOtherOrgCnt>2</TotalOtherOrgCnt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES CONTRIBUTIONS TO OTHER ENTITIES WITH SIMILAR ORTHOPAEDIC RELATED MISSIONS FOR THE GENERAL SUPPORT OF THESE ORGANIZATIONS. IF THE FUNDS ARE TO BE USED FOR GENERAL SUPPORT OF THEIR MISSION, WE DO NOT REQUIRE THESE ORGANIZATIONS TO SUBSTANTIATE THEIR EXPENDITURES RELATED TO THESE CONTRIBUTIONS. FOR SOME PROJECTS, HOWEVER, A FINAL REPORT IS REQUIRED TO SUBSTANTIATE THE EXPENDITURES.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
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      <RltdOrgOfficerTrstKeyEmplGrp>
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      <RltdOrgOfficerTrstKeyEmplGrp>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DEBORAH CUMMINS</PersonNm>
        <TitleTxt>DIRECTOR OF RESEARCH</TitleTxt>
        <BaseCompensationFilingOrgAmt>153402</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>254</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>5067</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>18868</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>10282</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>187873</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>AIRFARE ONE CLASS UP FROM COACH IS AVAILABLE TO THE PRESIDENTIAL LINE FOR ALL AAOS ACTIVITIES, AND ONE PERSON RECEIVED THIS BENEFIT IN 2013. AIRFARE ONE CLASS UP FROM COACH IS AVAILABLE TO THE BOARD OF DIRECTORS FOR ALL BOARD-RELATED ACTIVITIES AND 6 PEOPLE RECEIVED THIS BENEFIT IN 2013. TRAVEL FOR COMPANIONS IS AVAILABLE TO THE BOARD OF DIRECTORS AND EXECUTIVE TEAM MEMBERS (CEO, COO/CFO, CHIEF TECHNOLOGY OFFICER, 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 (2 PEOPLE IN 2013). THE BOARD OF DIRECTORS RECEIVES GROSS-UP PAYMENTS FOR THIS COMPENSATION AND THAT IS ALSO TREATED AS TAXABLE COMPENSATION (19 PEOPLE IN 2013).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 4B</FormAndLineReferenceDesc>
        <ExplanationTxt>KAREN HACKETT, CHIEF EXECUTIVE OFFICER, ACCRUED A 457F SUPPLEMENTAL RETIREMENT PAYMENT OF $16,500, WHICH IS INCLUDED IN SCHEDULE J, PART II DEFERRED COMPENSATION.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleL documentId="RetDoc1042800001">
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>ANDREW N POLLAK MD</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>BOARD MEMBER</RelationshipDescriptionTxt>
        <TransactionAmt>163263</TransactionAmt>
        <TransactionDesc>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.</TransactionDesc>
        <SharingOfRevenuesInd>1</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>AS A MEMBERSHIP ASSOCIATION, THE ORGANIZATION CURRENTLY HAS 37,220 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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11</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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</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 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 TECHNOLOGY OFFICER, CHIEF EDUCATION OFFICER, MEDICAL DIRECTOR, AND GENERAL COUNSEL.</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 XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>GAIN IN ORTHO PROPOERTIES LLC 2,622,474.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C</FormAndLineReferenceDesc>
        <ExplanationTxt>THIS PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>AMERICAN ASSOCIATION OF ORTHOPAEDIC SURGEONS</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
        </USAddress>
        <EIN>364241052</EIN>
        <PrimaryActivitiesTxt>ADVOCACY ACTIVITIES ON BEHALF OF PATIENTS AND PROFESSIONALS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(6)</ExemptCodeSectionTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>CENTER FOR ORTHOPAEDIC ADVANCEMENT NFP</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
        </USAddress>
        <EIN>263164922</EIN>
        <PrimaryActivitiesTxt>SUPPORT EDUCATIONAL ACTIVITIES OF AAOS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 11A, I</PublicCharityStatusTxt>
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      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>AMERICAN JOINT REPLACEMENT REGISTRY NFP</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
        </USAddress>
        <EIN>270645591</EIN>
        <PrimaryActivitiesTxt>FOSTER A NATIONAL CENTER FOR DATA COLLECTION ON JOINT REPLACEMENTS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 11A, I</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1>ORTHO PROPERTIES LLC</BusinessNameLine1>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1>6300 N RIVER RD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
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        <EIN>320402949</EIN>
        <PrimaryActivitiesTxt>RENTAL</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1>AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS</BusinessNameLine1>
        </DirectControllingEntityName>
        <PredominantIncomeTypeTxt>RELATED</PredominantIncomeTypeTxt>
        <ShareOfEOYAssetsAmt>18159930</ShareOfEOYAssetsAmt>
        <DisproportionateAllocationsInd>0</DisproportionateAllocationsInd>
        <GeneralOrManagingPartnerInd>1</GeneralOrManagingPartnerInd>
        <OwnershipPct>0.68650</OwnershipPct>
      </IdRelatedOrgTxblPartnershipGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>1</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>1</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>1</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1>AMERICAN ASSOCIATION OF ORTHOPAEDIC SURGEONS</BusinessNameLine1>
        </OtherOrganizationName>
        <TransactionTypeTxt>C</TransactionTypeTxt>
        <InvolvedAmt>9000000</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1>AMERICAN ASSOCIATION OF ORTHOPAEDIC SURGEONS</BusinessNameLine1>
        </OtherOrganizationName>
        <TransactionTypeTxt>Q</TransactionTypeTxt>
        <InvolvedAmt>4279095</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1>ORTHO PROPERTIES LLC</BusinessNameLine1>
        </OtherOrganizationName>
        <TransactionTypeTxt>B</TransactionTypeTxt>
        <InvolvedAmt>11465732</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>COST</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>