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      <Form990PartVIISectionAGrp>
        <PersonNm>LUSK EILEEN</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MALVAR-LEDDA RENALIN J</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MITCHELL JEFF</PersonNm>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>RODGERS CHIARA</PersonNm>
        <TitleTxt>DIR OF RESEARCH AND HUMANI</TitleTxt>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>WOLFE SIGITA</PersonNm>
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      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>PRA</BusinessNameLine1Txt>
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        </ContractorName>
        <ContractorAddress>
          <USAddress>
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        <ContractorName>
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        </ContractorName>
        <ContractorAddress>
          <USAddress>
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            <StateAbbreviationCd>DC</StateAbbreviationCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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          <USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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        <ContractorAddress>
          <USAddress>
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            <StateAbbreviationCd>IL</StateAbbreviationCd>
            <ZIPCd>60608</ZIPCd>
          </USAddress>
        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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        <ContractorAddress>
          <USAddress>
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            <StateAbbreviationCd>IL</StateAbbreviationCd>
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          </USAddress>
        </ContractorAddress>
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      <CntrctRcvdGreaterThan100KCnt>7</CntrctRcvdGreaterThan100KCnt>
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      <TotalContributionsAmt>1256950</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>ANNUAL MEETINGS</Desc>
        <BusinessCd>611430</BusinessCd>
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      <ProgramServiceRevenueGrp>
        <Desc>DUES</Desc>
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      <ProgramServiceRevenueGrp>
        <Desc>JOURNAL ADMINISTRATION</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>352653</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>352653</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
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        <BusinessCd>611430</BusinessCd>
        <TotalRevenueColumnAmt>44575</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>44575</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>EDUCATION</Desc>
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        <RelatedOrExemptFuncIncomeAmt>36831</RelatedOrExemptFuncIncomeAmt>
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        <EOYAmt>2214</EOYAmt>
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        <EOYAmt>938732</EOYAmt>
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      <DeferredRevenueGrp>
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      <UnsecuredNotesLoansPayableGrp>
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        <EOYAmt>1925744</EOYAmt>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
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        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
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        <ContributorNum>RESTRICTED</ContributorNum>
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          <AddressLine2>RESTRICTED</AddressLine2>
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      <RevenueNotReportedFinclStmtAmt>46196</RevenueNotReportedFinclStmtAmt>
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      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>6362682</ExpensesSubtotalAmt>
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      <ExpensesNotRptFinclStmtAmt>46196</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>6408878</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <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, 2021 THE ASSOCIATION HAD NO UNCERTAIN TAX POSITIONS THAT QUALIFY FOR RECOGNITION OR DISCLOSURE IN THE FINANCIAL STATEMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
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    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>THE KNEE SOCIETY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1515 E WOODFIELD ROAD 345</AddressLine1Txt>
          <CityNm>SCHAUMBURG</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60173</ZIPCd>
        </USAddress>
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        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
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        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>PUBLICATION OF MEETING PROCEEDINGS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>THE HIP SOCIETY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1515 E WOODFIELD ROAD 345</AddressLine1Txt>
          <CityNm>SCHAUMBURG</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60173</ZIPCd>
        </USAddress>
        <RecipientEIN>237348162</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>50000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>PUBLICATION OF MEETING PROCEEDINGS</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>2</Total501c3OrgCnt>
      <TotalOtherOrgCnt>0</TotalOtherOrgCnt>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>JAMES A RAND AWARD</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>1000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>SURGICAL TECHNIQUES AWARD</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>1000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>POSTER AWARDS</GrantTypeTxt>
        <RecipientCnt>8</RecipientCnt>
        <CashGrantAmt>4000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>CLINICAL RESEARCH AWARD</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>1000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>HUMANITARIAN AWARD</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>5000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>BEST PODIUM AWARD</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>1000</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>
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        <PersonNm>ZARSKI MICHAEL</PersonNm>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>6325</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>8700</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>14193</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>404218</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KERR JOSHUA</PersonNm>
        <TitleTxt>DEPUTY EXECUTIVE DIRECTOR</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>4762</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>176818</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LUSK EILEEN</PersonNm>
        <TitleTxt>SENIOR DIRECTOR OF MEMBERS</TitleTxt>
        <BaseCompensationFilingOrgAmt>118258</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>3548</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>36657</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>158463</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>WOLFE SIGITA</PersonNm>
        <TitleTxt>SR DIR OF EDUCATION AND SCIENCE</TitleTxt>
        <BaseCompensationFilingOrgAmt>136513</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>13334</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>153942</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
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      <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 IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>HEALTH POLICY CONSULTING 206,887. JOURNAL EDITORS 338,504. MARKETING AND SALES CONSULTANT 48,000. OTHER 28,106. SEARCH FIRM 44,707.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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        <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>
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        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
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        <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>
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      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
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</Return>
