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        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FINANCIAL STATEMENT EFFECTS OF A TAX POSITION TAKEN OR EXPECTED TO BE TAKEN ARE RECOGNIZED IN THE FINANCIAL STATEMENTS WHEN IT IS MORE LIKELY THAN NOT, BASED ON THE TECHNICAL MERITS, THAT THE POSITION WILL BE SUSTAINED UPON EXAMINATION. AS OF DECEMBER 31, 2019 THE ASSOCIATION HAD NO UNCERTAIN TAX POSITIONS THAT QUALIFY FOR RECOGNITION OR DISCLOSURE IN THE FINANCIAL STATEMENTS.</ExplanationTxt>
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      </AccountActivitiesOutsideUSGrp>
      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>SOUTH AMERICA</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>GRANT TO RECIPIENT LOCATED IN REGION</TypeOfActivitiesConductedTxt>
        <RegionTotalExpendituresAmt>10000</RegionTotalExpendituresAmt>
      </AccountActivitiesOutsideUSGrp>
      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>MIDDLE EAST AND NORTH AFRICA</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>GRANT TO RECIPIENT LOCATED IN REGION</TypeOfActivitiesConductedTxt>
        <RegionTotalExpendituresAmt>2804</RegionTotalExpendituresAmt>
      </AccountActivitiesOutsideUSGrp>
      <SubtotalOfficesCnt>0</SubtotalOfficesCnt>
      <SubtotalEmployeesCnt>0</SubtotalEmployeesCnt>
      <ContinuationTotalOfficeCnt>0</ContinuationTotalOfficeCnt>
      <ContinuationTotalEmployeeCnt>0</ContinuationTotalEmployeeCnt>
      <TotalOfficeCnt>0</TotalOfficeCnt>
      <TotalEmployeeCnt>0</TotalEmployeeCnt>
      <SubtotalSpentAmt>22804</SubtotalSpentAmt>
      <ContinuationSpentAmt>0</ContinuationSpentAmt>
      <TotalSpentAmt>22804</TotalSpentAmt>
      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>INTERNATIONAL SURGEON TRAVEL FELLOWSHIP AT MEDICAL ACADEMIC INSTITUTION</TypeOfAssistanceTxt>
        <RegionTxt>SOUTH AMERICA</RegionTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>10000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>ELECTRONIC FUNDS TRANSFER</MannerOfCashDisbursementTxt>
      </ForeignIndividualsGrantsGrp>
      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>INTERNATIONAL SURGEON TRAVEL FELLOWSHIP AT MEDICAL ACADEMIC INSTITUTION</TypeOfAssistanceTxt>
        <RegionTxt>EAST ASIA AND THE PACIFIC</RegionTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>10000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>ELECTRONIC FUNDS TRANSFER</MannerOfCashDisbursementTxt>
      </ForeignIndividualsGrantsGrp>
      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>AAOS 2019 SCHOLARSHIP TRAVEL/HOTEL COST</TypeOfAssistanceTxt>
        <RegionTxt>MIDDLE EAST AND NORTH AFRICA</RegionTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>2804</CashGrantAmt>
        <MannerOfCashDisbursementTxt>ELECTRONIC FUNDS TRANSFER</MannerOfCashDisbursementTxt>
      </ForeignIndividualsGrantsGrp>
      <TransferToForeignCorpInd>0</TransferToForeignCorpInd>
      <InterestInForeignTrustInd>0</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>0</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>0</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>0</ForeignPartnershipInd>
      <BoycottCountriesInd>0</BoycottCountriesInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FUNDS ARE USED BY A MEMBER FROM EACH OF TWO INTERNATIONAL GUEST SOCIETIES TO ATTEND OUR ANNUAL MEETING. THE FUNDS ARE ALSO USED FOR THESE INDIVIDUALS, IF THEY MEET OUR REQUIREMENTS, TO REMAIN IN THE UNITED STATES UP TO FOUR WEEKS OF ADDITIONAL TRAINING AT TWO US INSTITUTIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III ACCOUNTING METHOD:</FormAndLineReferenceDesc>
      </SupplementalInformationDetail>
    </IRS990ScheduleF>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>FOUNDATION FOR ARTHOPLASTY RESEARCH AND EDUCATION</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>9400 W HIGGINS SUITE 230</AddressLine1Txt>
          <CityNm>ROSEMONT</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60018</ZIPCd>
        </USAddress>
        <RecipientEIN>472095371</RecipientEIN>
        <IRCSectionDesc>501(C)3</IRCSectionDesc>
        <CashGrantAmt>200000</CashGrantAmt>
        <PurposeOfGrantTxt>FUNDING FROM AAHKS TO FARE</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>AAHKS GLOBAL OUTREACH</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>9400 W HIGGINS SUITE 230</AddressLine1Txt>
          <CityNm>ROSEMONT</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60018</ZIPCd>
        </USAddress>
        <RecipientEIN>843891333</RecipientEIN>
        <IRCSectionDesc>501(C)3</IRCSectionDesc>
        <CashGrantAmt>10705</CashGrantAmt>
        <PurposeOfGrantTxt>FUNDING FROM AAHKS TO AAHKS GLOBAL OUTREACH</PurposeOfGrantTxt>
      </RecipientTable>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>JAMES A RAND AWARD</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>1234</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>LARRY DORR AWARD</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>1117</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>POSTER AWARDS</GrantTypeTxt>
        <RecipientCnt>9</RecipientCnt>
        <CashGrantAmt>3500</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>CLINICAL RESEARCH AWARD</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>1117</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>BASED ON THE TYPE OF GRANT, THE RECIPIENT IS REQUIRED TO WRITE A REPORT ON THE RESULTS OF THEIR PROJECT. SOME REPORTS ARE PUBLISHED IN THE AAHKS PUBLICATIONS. SOME RECIPIENTS PRESENT AT BOARD MEETINGS OR BUSINESS MEETINGS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <IndependentConsultantInd>X</IndependentConsultantInd>
      <WrittenEmploymentContractInd>X</WrittenEmploymentContractInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ZARSKI MICHAEL</PersonNm>
        <TitleTxt>EXECUTIVE DIRECTOR</TitleTxt>
        <BaseCompensationFilingOrgAmt>276732</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>12992</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>6325</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>8000</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>18745</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>322794</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE ARE TEN CATEGORIES OF MEMBERSHIP IN THE ASSOCIATION: FELLOW, ASSOCIATE, HONORARY, EMERITUS, CLINICAL AFFILIATE, NON-CLINICAL AFFILIATE, CANDIDATE, ARTHROPLASTY SURGEON IN TRAINING, INTERNATIONAL AND INTERNATIONAL RESIDENT. FELLOWS, ASSOCIATE MEMBERS AND INTERNATIONAL MEMBERS MAY VOTE. ALL OTHER MEMBER-TYPES HAVE NO VOTING RIGHTS FOR ELECTING BOARD DIRECTORS AND OFFICERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS ELECT THE OFFICERS AND BOARD AT THE ANNUAL MEETING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS MUST APPROVE CHANGES TO THE BYLAWS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CPA, EXECUTIVE DIRECTOR AND TREASURER REVIEW THE 990.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL OFFICERS, COMMITTEE MEMBERS. OTHER VOLUNTEERS AND THE EXECUTIVE DIRECTOR ARE REQUIRED TO COMPLETE A CONFLICT OF INTEREST DISCLOSURE FORM. COPIES OF THE COMPLETED CONFLICT OF INTEREST FORMS ARE AVAILABLE TO ALL VOLUNTEERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE DIRECTOR'S COMPENSATION WAS ESTABLISHED BY THE BOARD. A CONSULTANT REVIEWED THE AMERICAN SOCIETY OF ASSOCIATION EXECUTIVES AND THE ASSOCIATION FORUM OF CHICAGO'S COMPENSATION AND BENEFITS SURVEYS, AND ESTABLISHED A SALARY AT AROUND THE MIDPOINT FOR ASSOCIATIONS WITH THE BUDGET SIZE OF AAHKS. SALARIES ARE REVIEWED BY THE FINANCE COMMITTEE AND EXECUTIVE COMMITTEE FOR ALL EMPLOYEES AND APPROVED BY THE BOARD AS PART OF THE BUDGETING PROCESS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL GOVERNING DOCUMENTS ARE MAINTAINED IN THE ASSOCIATION'S OFFICE AND ARE AVAILABLE FOR PUBLIC INSPECTION, AS REQUIRED. THE ASSOCIATION DOES NOT CHARGE FOR MAKING COPIES, AND WILL MAIL COPIES OF PUBLIC RECORDS TO ANYONE WHO REQUESTS THEM. THE FORM 990 IS ALSO AVAILABLE ON THE GUIDESTAR.COM WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>EFFECT OF CHANGE IN ACCOUNTING PRINCIPLE 139,711.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>FOUNDATION FOR ARTHROPLASTY RESEARCH AND EDUCATION</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>9400 W HIGGINS RD STE 230</AddressLine1Txt>
          <CityNm>ROSEMONT</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60018</ZIPCd>
        </USAddress>
        <EIN>472095371</EIN>
        <PrimaryActivitiesTxt>RESEARCH AND EDUCATION</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 7</PublicCharityStatusTxt>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>AAHKS GLOBAL OUTREACH</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>9400 W HIGGINS RD STE 230</AddressLine1Txt>
          <CityNm>ROSEMONT</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60018</ZIPCd>
        </USAddress>
        <EIN>843891333</EIN>
        <PrimaryActivitiesTxt>TO ASSIST INTERNATIONAL OPERATION WALK MISSIONS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 7</PublicCharityStatusTxt>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>1</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>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>FOUNDATION OF ARTHOPLASTY RESEARCH AND EDUCATION</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>B</TransactionTypeTxt>
        <InvolvedAmt>200000</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>CASH</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>AAHKS GLOBAL OUTREACH</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>B</TransactionTypeTxt>
        <InvolvedAmt>10705</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>CASH</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>