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      <Travel>
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      </DepreciationDepletion>
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      <OtherExpenses>
        <Description>DUES AND SUBSCRIPTIONS</Description>
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      <OtherExpenses>
        <Description>PRINTING</Description>
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      <OtherExpenses>
        <Description>EQUIPMENT RENTAL</Description>
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      <AllOtherExpenses>
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        <Identifier>DESCRIPTION OF INTENDED USE OF ENDOWMENT FUNDS:</Identifier>
        <ReturnReference>PART V, LINE 4:</ReturnReference>
        <Explanation>THE PURPOSE OF THE ENDOWMENT FUND IS TO PROVIDE FUNDING FOR THE COUNCIL ON ADVOCACY AND THE COMMUNICATIONS CABINET AS WELL AS LITIGATION EXPENSES.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>DESCRIPTION OF UNCERTAIN TAX POSITIONS UNDER FIN 48:</Identifier>
        <ReturnReference>PART X:</ReturnReference>
        <Explanation>THE ACADEMY AND ASSOCIATION'S APPLICATION OF GAAPUSA REGARDING UNCERTAIN TAX POSITIONS HAD NO EFFECT ON ITS FINANCIAL POSITION AS MANAGEMENT BELIEVES THE ACADEMY AND ASSOCIATION HAS NO MATERIAL UNRECOGNIZED INCOME TAX BENEFITS, INCLUDING ANY POTENTIAL RISK OF LOSS OF ITS NOT-FOR-PROFIT TAX STATUS. THE ACADEMY AND ASSOCIATION WOULD ACCOUNT FOR ANY POTENTIAL INTEREST OR PENALTIES RELATED TO POSSIBLE FUTURE LIABILITIES FOR UNRECOGNIZED INCOME TAX BENEFITS AS INCOME TAX EXPENSE. THE ACADEMY IS NO LONGER SUBJECT TO EXAMINATION BY FEDERAL, STATE OR LOCAL TAX AUTHORITIES FOR PERIODS BEFORE 2008.</Explanation>
      </Form990ScheduleDPartXIV>
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      <Form990ScheduleDPartXIV>
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      </FundraiserActivityInformation>
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      <LicensedStates>AK</LicensedStates>
      <LicensedStates>AZ</LicensedStates>
      <LicensedStates>AR</LicensedStates>
      <LicensedStates>CA</LicensedStates>
      <LicensedStates>CO</LicensedStates>
      <LicensedStates>CT</LicensedStates>
      <LicensedStates>DE</LicensedStates>
      <LicensedStates>FL</LicensedStates>
      <LicensedStates>GA</LicensedStates>
      <LicensedStates>HI</LicensedStates>
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      <LicensedStates>IN</LicensedStates>
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      <LicensedStates>KY</LicensedStates>
      <LicensedStates>LA</LicensedStates>
      <LicensedStates>ME</LicensedStates>
      <LicensedStates>MD</LicensedStates>
      <LicensedStates>MA</LicensedStates>
      <LicensedStates>MI</LicensedStates>
      <LicensedStates>MN</LicensedStates>
      <LicensedStates>MS</LicensedStates>
      <LicensedStates>MO</LicensedStates>
      <LicensedStates>MT</LicensedStates>
      <LicensedStates>NE</LicensedStates>
      <LicensedStates>NV</LicensedStates>
      <LicensedStates>NH</LicensedStates>
      <LicensedStates>NJ</LicensedStates>
      <LicensedStates>NM</LicensedStates>
      <LicensedStates>NY</LicensedStates>
      <LicensedStates>NC</LicensedStates>
      <LicensedStates>ND</LicensedStates>
      <LicensedStates>OH</LicensedStates>
      <LicensedStates>OK</LicensedStates>
      <LicensedStates>OR</LicensedStates>
      <LicensedStates>PA</LicensedStates>
      <LicensedStates>RI</LicensedStates>
      <LicensedStates>SC</LicensedStates>
      <LicensedStates>SD</LicensedStates>
      <LicensedStates>TN</LicensedStates>
      <LicensedStates>TX</LicensedStates>
      <LicensedStates>UT</LicensedStates>
      <LicensedStates>VT</LicensedStates>
      <LicensedStates>VA</LicensedStates>
      <LicensedStates>WA</LicensedStates>
      <LicensedStates>WV</LicensedStates>
      <LicensedStates>WI</LicensedStates>
      <LicensedStates>WY</LicensedStates>
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        <ReturnReference>SCHEDULE G, PART I, LINE 2B, COLUMN (V)</ReturnReference>
        <Explanation>THE ORGANIZATION HAS AN AGREEMENT WITH A FUNDRAISING ORGANIZATION WHICH INCLUDES SOLICITING CONTRIBUTIONS ON BEHALF OF A RELATED POLITICAL ACTION COMMITTEE. THESE CONTRIBUTIONS ARE SENT DIRECTLY TO THE POLITICAL ACTION COMMITTEE.</Explanation>
      </Form990ScheduleGPartIV>
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          <BusinessNameLine1>OREGON ASSOCIATION OF ORTHO INC</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>833 SW 11TH AVENUE STE 315</AddressLine1>
          <City>PORTLAND</City>
          <State>OR</State>
          <ZIPCode>97205</ZIPCode>
        </AddressUS>
        <EINOfRecipient>943130225</EINOfRecipient>
        <IRCSection>501(C)(6)</IRCSection>
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        <PurposeOfGrant>STATE SOCIETY ASSISTANCE</PurposeOfGrant>
      </RecipientTable>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>CALIFORNIA ORTHOPAEDIC ASSOCIATION</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>5380 ELVAS AVENUE STE 221</AddressLine1>
          <City>SACRAMENTO</City>
          <State>CA</State>
          <ZIPCode>95819</ZIPCode>
        </AddressUS>
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        <PurposeOfGrant>STATE SOCIETY ASSISTANCE</PurposeOfGrant>
      </RecipientTable>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>PENNSYLVANIA ORTHOPAEDIC SOCIETY</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>500 NORTH THIRD STREET 11TH FL</AddressLine1>
          <City>HARRISBURG</City>
          <State>PA</State>
          <ZIPCode>17101</ZIPCode>
        </AddressUS>
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        <AmountOfCashGrant>7500</AmountOfCashGrant>
        <PurposeOfGrant>STATE SOCIETY ASSISTANCE</PurposeOfGrant>
      </RecipientTable>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>MINNESOTA ORTHOPAEDIC SOCIETY</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>1821 UNIVERSITY AVENUE WEST STE</AddressLine1>
          <AddressLine2>S256</AddressLine2>
          <City>ST PAUL</City>
          <State>MN</State>
          <ZIPCode>55104</ZIPCode>
        </AddressUS>
        <EINOfRecipient>237389067</EINOfRecipient>
        <IRCSection>501(C)(6)</IRCSection>
        <AmountOfCashGrant>6100</AmountOfCashGrant>
        <PurposeOfGrant>STATE SOCIETY ASSISTANCE</PurposeOfGrant>
      </RecipientTable>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>MARYLAND ORTHOPAEDIC ASSOCIATION</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>110 WEST ROAD STE 227</AddressLine1>
          <City>TOWSON</City>
          <State>MD</State>
          <ZIPCode>21204</ZIPCode>
        </AddressUS>
        <EINOfRecipient>521979179</EINOfRecipient>
        <IRCSection>501(C)(6)</IRCSection>
        <AmountOfCashGrant>45000</AmountOfCashGrant>
        <PurposeOfGrant>STATE SOCIETY ASSISTANCE</PurposeOfGrant>
      </RecipientTable>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>MICHIGAN ORTHOPAEDIC SOCIETY</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>PO BOX 475</AddressLine1>
          <City>NORTHVILLE</City>
          <State>MI</State>
          <ZIPCode>48167</ZIPCode>
        </AddressUS>
        <EINOfRecipient>383237300</EINOfRecipient>
        <IRCSection>501(C)(6)</IRCSection>
        <AmountOfCashGrant>13025</AmountOfCashGrant>
        <PurposeOfGrant>STATE SOCIETY ASSISTANCE</PurposeOfGrant>
      </RecipientTable>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>SOUTH CAROLINA ORTHOPAEDIC ASSOCIATION</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>146 TURNBUCKLE COURT</AddressLine1>
          <City>CLEMMON</City>
          <State>NC</State>
          <ZIPCode>27012</ZIPCode>
        </AddressUS>
        <EINOfRecipient>570743252</EINOfRecipient>
        <IRCSection>501(C)(6)</IRCSection>
        <AmountOfCashGrant>75000</AmountOfCashGrant>
        <PurposeOfGrant>STATE SOCIETY ASSISTANCE</PurposeOfGrant>
      </RecipientTable>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>ORTHOPAEDIC RESEARCH SOCIETY</BusinessNameLine1>
        </RecipientNameBusiness>
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          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
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        <EINOfRecipient>363180285</EINOfRecipient>
        <IRCSection>501(C)(3)</IRCSection>
        <AmountOfCashGrant>11000</AmountOfCashGrant>
        <PurposeOfGrant>GENERAL SUPPORT</PurposeOfGrant>
      </RecipientTable>
      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>ORTHOPAEDIC RESEARCH AND EDUCATION FOUNDATION</BusinessNameLine1>
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          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
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        <EINOfRecipient>366009467</EINOfRecipient>
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        <AmountOfCashGrant>10000</AmountOfCashGrant>
        <PurposeOfGrant>GENERAL SUPPORT</PurposeOfGrant>
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      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS</BusinessNameLine1>
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          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
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        <EINOfRecipient>362110592</EINOfRecipient>
        <IRCSection>501(C)(3)</IRCSection>
        <AmountOfCashGrant>9250000</AmountOfCashGrant>
        <PurposeOfGrant>GENERAL SUPPORT</PurposeOfGrant>
      </RecipientTable>
      <TotalNbrOf501C3AndGovtGrants>3</TotalNbrOf501C3AndGovtGrants>
      <TotalNbrOfOtherOrganizations>7</TotalNbrOfOtherOrganizations>
      <Form990ScheduleIPartIV>
        <Identifier>PROCEDURE FOR MONITORING GRANTS IN THE U.S.:</Identifier>
        <ReturnReference>PART I, LINE 2:</ReturnReference>
        <Explanation>SCHEDULE I, PART I, LINE 2: 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 THE 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.</Explanation>
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    </IRS990ScheduleI>
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        <NamePerson>TINA D SLAGER</NamePerson>
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        <ReturnReference>PART I, LINE 1A</ReturnReference>
        <Explanation>AIRFARE ONE CLASS UP FROM COACH IS AVAILABLE TO THE PRESIDENTIAL LINE FOR ALL AAOS ACTIVITIES HOWEVER NO PERSON RECEIVED THIS BENEFIT IN 2011. AIRFARE ONE CLASS UP FROM COACH IS AVAILABLE TO THE BOARD OF DIRECTORS FOR ALL BOARD-RELATED ACTIVITIES AND TEN PEOPLE RECEIVED THIS BENEFIT. TRAVEL FOR COMPANIONS IS AVAILABLE TO THE BOARD OF DIRECTORS AND EXECUTIVE TEAM MEMBERS (CEO, CFO, 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. (19 PEOPLE). THE BOARD OF DIRECTORS RECEIVES GROSS-UP PAYMENTS FOR THIS COMPENSATION AND THAT IS ALSO TREATED AS TAXABLE COMPENSATION (17 PEOPLE).</Explanation>
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      <Form990ScheduleJPartIII>
        <ReturnReference>PART I, LINE 4B</ReturnReference>
        <Explanation>KAREN L. HACKETT, CHIEF EXECUTIVE OFFICER, ACCRUED A 457F SUPPLEMENTAL RETEIREMENT PAYMENT OF $16,500, FROM THE AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS, A RELATED ORGANIZATION. THIS AMOUNT IS INCLUDED ON SCHEDULE J, PART II, DEFERRED COMPENSATION.</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <Identifier>SUPPLEMENTAL INFORMATION</Identifier>
        <ReturnReference>PART III</ReturnReference>
        <Explanation>SCHEDULE J, PART 1, QUESTION 3 - COMPENSATION REVIEW PROCEDURES: COMPENSATION REVIEW PROCEDURES ARE PERFORMED BY A RELATED ORGANIZATION, THE AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS. 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 FINANCIAL OFFICER, CHIEF EDUCATION OFFICER, MEDICAL DIRECTOR, AND GENERAL COUNSEL.</Explanation>
      </Form990ScheduleJPartIII>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION A, LINE 6</ReturnReference>
        <Explanation>AS A MEMBERSHIP ASSOCIATION, THE ORGANIZATION CURRENTLY HAS 36,000 MEMBERS. ALL FELLOWS AND MEMBERS OF THE AMERICAN ASSOCIATION OF ORTHOPAEDIC SURGEONS (ASSOCIATION), SHALL ALSO BE CONSIDERED FELLOWS AND MEMBERS OF THE SAME CLASSIFICATION OF THE AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS (ACADEMY), 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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION A, LINE 7A</ReturnReference>
        <Explanation>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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 11</ReturnReference>
        <Explanation>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 VIA A SECURE SECTION OF ITS WEBSITE PRIOR TO FILING. A CONFERENCE CALL IS SCHEDULED FOR THE CPA FIRM AND ORGANIZATION MANAGEMENT TO DISCUSS FORM 990 WITH THE FINANCE COMMITTEE AND TO ANSWER ANY QUESTIONS PRIOR TO FILING THE 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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 12C</ReturnReference>
        <Explanation>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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 15</ReturnReference>
        <Explanation>COMPENSATION REVIEW PROCEDURES ARE PERFORMED BY A RELATED ORGANIZATION, THE AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS. 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 FINANCIAL OFFICER, CHIEF EDUCATION OFFICER, MEDICAL DIRECTOR, AND GENERAL COUNSEL.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION C, LINE 19</ReturnReference>
        <Explanation>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 APPLICABLE GOVERNMENTAL AGENCIES.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990 - PART VII - SECTION A - COMPENSATION DISCLOSURES</ReturnReference>
        <Explanation>COMPENSATION FOR WILLIAM R. MARTIN, MD AND GRAHAM H. NEWSON HAS BEEN PAID BY A COMMON PAYMASTER AND RELATED ORGANIZATION, AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS EIN# 36-2110592. SINCE ALL SERVICES PERFORMED BY THESE INDIVIDUALS WERE FOR THE AMERICAN ASSOCIATION OF ORTHOPAEDIC SURGEONS, THE COMPENSATION HAS BEEN REPORTED IN COLUMN D AS IF PAID BY THE ORGANIZATION. AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS HAS COMPLIED WITH PAYROLL FILING REQUIREMENTS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990 - PART VII - SECTION A - COMPENSATION DISCLOSURES</ReturnReference>
        <Explanation>THE COMPENSATION FROM A RELATED ORGANIZATION, THE AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS (ACADEMY) REPORTED IN PART VII IS THE COMPENSATION PAID BY THE ACADEMY FOR A FULL-TIME POSITION HOWEVER A PORTION OF THESE INDIVIDUAL'S TIME IS DEVOTED TO THE FILING ORGANIZATION, AMERICAN ASSOCIATION OF ORTHOPAEDIC SURGEONS AND IS REIMBURSED BY THE FILING ORGANIZATION BASED ON TIME ALLOCATIONS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>CHANGES IN NET ASSETS OR FUND BALANCES:</Identifier>
        <ReturnReference>FORM 990, PART XI, LINE 5:</ReturnReference>
        <Explanation>NET UNREALIZED LOSSES ON INVESTMENTS: -241,622.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
        </AddressUS>
        <EIN>362110592</EIN>
        <PrimaryActivities>SERVE THE PROFESSION OF ORTHOPAEDIC SURGERY</PrimaryActivities>
        <LegalDomicileState>IL</LegalDomicileState>
        <ExemptCodeSection>501(C)(3)</ExemptCodeSection>
        <PublicCharityStatus>LINE 9</PublicCharityStatus>
        <ControlledOrg>1</ControlledOrg>
      </Form990ScheduleRPartII>
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>POLITICAL ACTION COMMITTEE OF AAOS</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>317 MASSACHUSETTS AVE NE</AddressLine1>
          <City>WASHINGTON</City>
          <State>DC</State>
          <ZIPCode>20002</ZIPCode>
        </AddressUS>
        <EIN>262177172</EIN>
        <PrimaryActivities>POLITICAL CAMPAIGN ACTIVITIES</PrimaryActivities>
        <LegalDomicileState>DC</LegalDomicileState>
        <ExemptCodeSection>527</ExemptCodeSection>
        <ControlledOrg>1</ControlledOrg>
      </Form990ScheduleRPartII>
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>CENTER FOR ORTHOPAEDIC ADVANCEMENT NFP (COA)</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>6300 NORTH RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
        </AddressUS>
        <EIN>263164922</EIN>
        <PrimaryActivities>SUPPORT EDUCATIONAL ACTIVITIES OF AMER. ACADEMY ORTHOPAEDIC SURGEONS</PrimaryActivities>
        <LegalDomicileState>IL</LegalDomicileState>
        <ExemptCodeSection>501(C)(3)</ExemptCodeSection>
        <PublicCharityStatus>LINE 11A, I</PublicCharityStatus>
        <ControlledOrg>0</ControlledOrg>
      </Form990ScheduleRPartII>
      <ReceiptOfIntAnnRentsRoyalties>0</ReceiptOfIntAnnRentsRoyalties>
      <GiftGrantOrCapContrToOtherOrg>1</GiftGrantOrCapContrToOtherOrg>
      <GiftGrantOrCapContrFrOtherOrg>0</GiftGrantOrCapContrFrOtherOrg>
      <LoansOrGuaranteesToOtherOrg>0</LoansOrGuaranteesToOtherOrg>
      <LoansOrGuaranteesFromOtherOrg>0</LoansOrGuaranteesFromOtherOrg>
      <SaleOfAssetsToOtherOrg>0</SaleOfAssetsToOtherOrg>
      <PurchaseOfAssetsFromOtherOrg>0</PurchaseOfAssetsFromOtherOrg>
      <ExchangeOfAssets>0</ExchangeOfAssets>
      <RentalOfFacilitiesToOtherOrgs>0</RentalOfFacilitiesToOtherOrgs>
      <RentalOfFacilitiesFrOtherOrgs>0</RentalOfFacilitiesFrOtherOrgs>
      <PerformOfServicesForOtherOrgs>0</PerformOfServicesForOtherOrgs>
      <PerformOfServicesByOtherOrgs>0</PerformOfServicesByOtherOrgs>
      <SharingOfFacilities>1</SharingOfFacilities>
      <SharingOfPaidEmployees>1</SharingOfPaidEmployees>
      <ReimbursementPaidToOtherOrg>1</ReimbursementPaidToOtherOrg>
      <ReimbursementPaidByOtherOrg>0</ReimbursementPaidByOtherOrg>
      <OtherTransferToOtherOrg>0</OtherTransferToOtherOrg>
      <OtherTransferFromOtherOrg>0</OtherTransferFromOtherOrg>
      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS</BusinessNameLine1>
        </NameOfOtherOrganization>
        <TransactionType>B</TransactionType>
        <AmountInvolved>9250000</AmountInvolved>
        <MethodOfAmtDetermination>COST</MethodOfAmtDetermination>
      </TransactionsRelatedOrgsTable>
      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS</BusinessNameLine1>
        </NameOfOtherOrganization>
        <TransactionType>O</TransactionType>
        <AmountInvolved>2725071</AmountInvolved>
        <MethodOfAmtDetermination>COST</MethodOfAmtDetermination>
      </TransactionsRelatedOrgsTable>
    </IRS990ScheduleR>
  </ReturnData>
</Return>