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        <BeginningYearBalanceAmt>691480</BeginningYearBalanceAmt>
        <ContributionsAmt>15000</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-21047</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>9700</OtherExpendituresAmt>
        <EndYearBalanceAmt>675733</EndYearBalanceAmt>
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      <CYMinus2YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>649498</BeginningYearBalanceAmt>
        <ContributionsAmt>13500</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>33482</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>5000</OtherExpendituresAmt>
        <EndYearBalanceAmt>691480</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
      <CYMinus3YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>614118</BeginningYearBalanceAmt>
        <ContributionsAmt>32000</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>11380</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>8000</OtherExpendituresAmt>
        <EndYearBalanceAmt>649498</EndYearBalanceAmt>
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      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>615412</BeginningYearBalanceAmt>
        <ContributionsAmt>11000</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-4494</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>7800</OtherExpendituresAmt>
        <EndYearBalanceAmt>614118</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
      <BoardDesignatedBalanceEOYPct>0.51800</BoardDesignatedBalanceEOYPct>
      <PrmnntEndowmentBalanceEOYPct>0.45830</PrmnntEndowmentBalanceEOYPct>
      <TermEndowmentBalanceEOYPct>0.02370</TermEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>false</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
      <RelatedOrgListSchRInd>false</RelatedOrgListSchRInd>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>4547422</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>1319117</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>1319117</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>3228305</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>74924</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>74924</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>3303229</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>1227957</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesSubtotalAmt>1227957</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>74924</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>74924</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>1302881</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X : FIN48 Footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization is exempt from income tax under Section 501(c)(3) of Internal Revenue Code and is classified as other than a private foundation. Management has reviewed all tax positions recognized in previously filed tax returns and those expected to be taken in future tax returns. As of December 31, 2019, the Organization had no amounts related to unrecognized income tax benefits and no amounts related to accrued interest and penalties. The Organization does not anticipate any significant changes to unrecognized income tax benefits over the next year.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="IRS990ScheduleI" softwareId="19009920" softwareVersionNum="2019v5.0">
      <GrantRecordsMaintainedInd>true</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>ROTHMAN ORTHOPAEDIC INSTITUTE</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>925 CHESTNUT STREET</AddressLine1Txt>
          <CityNm>PHILADELPHIA</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19107</ZIPCd>
        </USAddress>
        <RecipientEIN>232856880</RecipientEIN>
        <IRCSectionDesc>501 (C)(3)</IRCSectionDesc>
        <CashGrantAmt>14452</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <ValuationMethodUsedDesc>FMV</ValuationMethodUsedDesc>
        <PurposeOfGrantTxt>RESEARCH GRANT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>SWEDISH HEALTH SERVICES</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>747 BROADWAY</AddressLine1Txt>
          <CityNm>SEATTLE</CityNm>
          <StateAbbreviationCd>WA</StateAbbreviationCd>
          <ZIPCd>98122</ZIPCd>
        </USAddress>
        <RecipientEIN>910433740</RecipientEIN>
        <IRCSectionDesc>501 (C)(3)</IRCSectionDesc>
        <CashGrantAmt>12140</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <ValuationMethodUsedDesc>FMV</ValuationMethodUsedDesc>
        <PurposeOfGrantTxt>RESEARCH GRANT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>UNIVERSITY HEALTH NETWORK</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <ForeignAddress>
          <AddressLine1Txt>190 ELIZABETH STREET</AddressLine1Txt>
          <CityNm>TORONTO</CityNm>
          <ProvinceOrStateNm>ONTARIO</ProvinceOrStateNm>
          <CountryCd>CA</CountryCd>
          <ForeignPostalCd>M5G2C4</ForeignPostalCd>
        </ForeignAddress>
        <RecipientEIN>986000971</RecipientEIN>
        <IRCSectionDesc>501 (C)(3)</IRCSectionDesc>
        <CashGrantAmt>90000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <ValuationMethodUsedDesc>FMV</ValuationMethodUsedDesc>
        <PurposeOfGrantTxt>RESEARCH GRANT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>UNIVERSITY OF ILLINOIS BOARD</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>809 SOUTH MARSHFIELD AVE</AddressLine1Txt>
          <CityNm>CHICAGO</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60612</ZIPCd>
        </USAddress>
        <RecipientEIN>376000511</RecipientEIN>
        <IRCSectionDesc>IL STATE GOVERNMENT</IRCSectionDesc>
        <CashGrantAmt>74999</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <ValuationMethodUsedDesc>FMV</ValuationMethodUsedDesc>
        <PurposeOfGrantTxt>RESEARCH GRANT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>UNIVERSITY OF IOWA HOSPITALS</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>105 JESSUP HALL</AddressLine1Txt>
          <CityNm>IOWA CITY</CityNm>
          <StateAbbreviationCd>IA</StateAbbreviationCd>
          <ZIPCd>52242</ZIPCd>
        </USAddress>
        <RecipientEIN>426004813</RecipientEIN>
        <IRCSectionDesc>IA STATE GOVERNMENT</IRCSectionDesc>
        <CashGrantAmt>24645</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <ValuationMethodUsedDesc>FMV</ValuationMethodUsedDesc>
        <PurposeOfGrantTxt>RESEARCH GRANT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>UNIVERSITY OF UTAH ORTHO</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>201 S PRESIDENTS CIRCLE</AddressLine1Txt>
          <CityNm>SALT LAKE CITY</CityNm>
          <StateAbbreviationCd>UT</StateAbbreviationCd>
          <ZIPCd>84112</ZIPCd>
        </USAddress>
        <RecipientEIN>876000525</RecipientEIN>
        <IRCSectionDesc>501 (C)(3)</IRCSectionDesc>
        <CashGrantAmt>25000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <ValuationMethodUsedDesc>FMV</ValuationMethodUsedDesc>
        <PurposeOfGrantTxt>RESEARCH GRANT</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>5</Total501c3OrgCnt>
      <TotalOtherOrgCnt>1</TotalOtherOrgCnt>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>RESEARCH AWARD PAPERS</GrantTypeTxt>
        <RecipientCnt>7</RecipientCnt>
        <CashGrantAmt>7375</CashGrantAmt>
        <ValuationMethodUsedDesc>FMV</ValuationMethodUsedDesc>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Grantmaker's Description of How Grants are Used</FormAndLineReferenceDesc>
        <ExplanationTxt>THE GRANT APPLICATIONS UNDERGO A RIGOROUS PEER REVIEW PROCESS BY THE CSRS RESEARCH COMMITTEE, WHICH IS COMPRISED OF CSRS MEMBERS AS WELL AS EX-OFFICIO MEMBERS OF INDUSTRY. RECIPIENTS ARE NOT ELIGIBLE FOR FUNDING IF THEY RECEIVE SUPPORT FROM OTHER ORGANIZATIONS. RECIPIENTS ARE ALSO REQUIRED TO NOTIFY THE ORGANIZATION IF OTHER FUNDING ARISES DURING THEIR PROJECT. GRANT RECIPIENTS MUST ATTEND THE ANNUAL MEETING AND PRESENT THEIR FINAL REPORT. RECIPIENTS ARE ALSO REQUIRED TO SUBMIT AN ABSTRACT FOR PODIUM PRESENTATION WITHIN 3 YEARS OF GRANT RECEIPTS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="19009920" softwareVersionNum="2019v5.0">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d: Other Program Services Description</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER PROGRAM SERVICES 4: OTHER PROGRAM SERVICES</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 3: Description of Delegated Duties to Management Company</FormAndLineReferenceDesc>
        <ExplanationTxt>MANAGEMENT DUTIES WERE DELEGATED TO AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS THROUGH MAY 2019 AND THEN TO EXECUTIVE DIRECTOR INC. JUNE 2019 THROUGH CURRENT. SUCH DUTIES INCLUDE STAFFING, ADMINISTRATIVE, CLERICAL, FINANCIAL, OFFICE SPACE, NEWSLETTER, WEBSITE, FUNDRAISING, AND OTHER SERVICES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6: Explanation of Classes of Members or Shareholder</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SOCIETY IS A MEMBERSHIP ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>A draft of the Form 990 and applicable schedules is provided to the Board for review and approval. Once approved the tax returns are finalized and filed.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</FormAndLineReferenceDesc>
        <ExplanationTxt>The Society analyzes amounts due from or to any officer, director or member of a committee with the governing board delegated powers to determine amounts paid to or received from such person. The Society also submits a questionnaire annually to such person with the questions designed to detect any violation of the conflict of interest policy. The Society prepares a report of its findings and presents it to the Board of Directors who determine the appropriate actions on a case by case basis.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19: Other Organization Documents Publicly Available</FormAndLineReferenceDesc>
        <ExplanationTxt>DOCUMENTS ARE AVAILABLE UPON REQUEST AND ON THE ORGANIZATION'S WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>