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        <Description>BENEFICIAL INTEREST IN NET ASSETS HE</Description>
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      <RevenueNotRptdOnFinStmt>55913</RevenueNotRptdOnFinStmt>
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        <Identifier>LIABILITY UNDER FIN 48 FOOTNOTE</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 3, PART X</ReturnReference>
        <Explanation>ACCOUNTING STANDARD PROVIDE GUIDANCE FOR HOW UNCERTAIN TAX POSITIONS SHOULD BE RECOGNIZED, MEASURED, DISCLOSED AND PRESENTED IN THE FINANCIAL STATEMENTS. THIS REQUIRES THE EVALUATION OF TAX POSITIONS TAKEN OR EXPECTED TO BE TAKEN IN THE COURSE OF PRESENTING THE ASSOCIATION'S TAX RETURNS TO DETERMINE WHETHER THE TAX POSITIONS ARE "MORE-LIKELY-THAN-NOT" OF BEING SUSTAINED "WHEN CHALLENGED" OR "WHEN EXAMINED" BY THE APPLICABLE TAX AUTHORITY. TAX POSITIONS NOT DEEMED TO MEET THE MORE-LIKELY-THAN-NOT THRESHOLD WOULD BE RECORDED AS A TAX BENEFIT AND ASSET OR EXPENSE AND LIABILITY IN THE CURRENT YEAR. THE ASSOCIATION FILES TAX RETURNS IN THE U.S. FEDERAL JURISDICTION AND ILLINOIS JURISDICTION. THE ASSOCIATION IS NO LONGER SUBJECT TO U.S. FEDERAL AND STATE INCOME TAX EXAMINATIONS BY TAX AUTHORITIES FOR YEARS BEFORE 2006. AS OF AND FOR THE YEARS ENDED DECEMBER 31, 2009 AND 2008, MANAGEMENT HAS DETERMINED THAT THERE ARE NO UNCERTAIN TAX POSITIONS.</Explanation>
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        <Identifier>RECONCILIATION OF CHANGES - OTHER</Identifier>
        <ReturnReference>SCHEDULE D, PAGE 4, PART XI, LINE 8</ReturnReference>
        <Explanation>RENTAL EXPENSES NETTER ON THE TAX RETURN 36,754 INVESTMENT FEES INCLUDED IN INV INCOME ON F/S -55,913 RENTAL EXPENSES NETTED ON THE TAX RETURN -36,754 INVESTMENT FEES INCLUDED IN INV INCOME ON F/S 55,913</Explanation>
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      <Form990ScheduleDPartXIV>
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        <ReturnReference>SCHEDULE D, PAGE 4, PART XII, LINE 4B</ReturnReference>
        <Explanation>INVESTMENT FEES INCLUDED IN INV INCOME ON F/S 55,913</Explanation>
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      <Form990ScheduleDPartXIV>
        <Identifier>EXPENSE AMOUNTS INCLUDED IN FINANCIALS - OTHER</Identifier>
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        <Explanation>RENTAL EXPENSES NETTED ON THE TAX RETURN 36,754</Explanation>
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        <ReturnReference>SCHEDULE D, PAGE 4, PART XIII, LINE 4B</ReturnReference>
        <Explanation>INVESTMENT FEES INCLUDED IN INV INCOME ON F/S 55,913</Explanation>
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          <BusinessNameLine1>OREF</BusinessNameLine1>
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          <AddressLine1>6300 N RIVER ROAD</AddressLine1>
          <City>ROSEMONT</City>
          <State>IL</State>
          <ZIPCode>60018</ZIPCode>
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        <EINOfRecipient>366009467</EINOfRecipient>
        <IRCSection>3</IRCSection>
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        <PurposeOfGrant>RESEARCH</PurposeOfGrant>
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      <RecipientTable>
        <RecipientNameBusiness>
          <BusinessNameLine1>SPRINGER</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>233 SPRING STREET</AddressLine1>
          <City>NEW YORK</City>
          <State>NY</State>
          <ZIPCode>10013</ZIPCode>
        </AddressUS>
        <EINOfRecipient>042509538</EINOfRecipient>
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        <PurposeOfGrant>RESEARCH</PurposeOfGrant>
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        <NumberOfRecipients>7</NumberOfRecipients>
        <AmountOfCashGrant>20200</AmountOfCashGrant>
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        <ReturnReference>SCHEDULE I, PAGE 1, PART I, LINE 2</ReturnReference>
        <Explanation>RECIPIENTS MUST MEET CERTAIN CRITERIA TO BE ELIGIBLE FOR GRANTS FROM THE ORGANIZATION. THE APPLICANTS GO THROUGH RIGOROUS SELECTION PROCESS AND MUST SUBMIT FULL CURRICULUM VITAE. ALL UNUSED FUNDS MUST BE RETURNED AND RECIPIENTS MUST NOTIFY THE ORGANIZATION OF OTHER FUNDING SOURCES. THEY MUST PRESENT AT ANNUAL MEETING.</Explanation>
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      <CompBasedOnRevenueOfFilingOrg>false</CompBasedOnRevenueOfFilingOrg>
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      <CompBasedNetEarningsRelateOrgs>false</CompBasedNetEarningsRelateOrgs>
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        <Identifier>ORGANIZATION'S MISSION</Identifier>
        <ReturnReference>FORM 990 - ORGANIZATION'S MISSION</ReturnReference>
        <Explanation>THE ASSOCIATION OF BONE AND JOINT SURGEONS (THE ASSOCIATION) IS A NONPROFIT CORPORATION, ORGANIZED TO EXCHANGE INFORMATION, STIMULATE DEVELOPMENT AND ADVANCEMENT OF ORTHOPAEDIC SURGERY, TRAIN LEADERS, SPONSOR AND CONTRIBUTE TO THE SCIENTIFIC ASPECTS OF, AND CLINICAL RESEARCH IN, ORTHOPAEDIC SURGERY, AND SPONSOR PUBLICATION OF THE SCIENTIFIC JOURNAL, CLINICAL ORTHOPAEDICS AND RELATED RESEARCH (CORR).</Explanation>
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      <GeneralExplanation>
        <Identifier>ALL OTHER ACHIEVEMENTS DESCRIPTION</Identifier>
        <ReturnReference>FORM 990, PAGE 2, PART III, LINE 4D</ReturnReference>
        <Explanation>MEMBERSHIP EXPENSES OF THE ORGANIZATION</Explanation>
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      <GeneralExplanation>
        <Identifier>MANAGEMENT DELEGATED</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 3</ReturnReference>
        <Explanation>MANAGEMENT IS DELEGATED TO AMERICAN ACADEMY OF ORTHOPAEDIC SURGEONS.</Explanation>
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      <GeneralExplanation>
        <Identifier>CLASSES OF MEMBERS OR STOCKHOLDERS</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 6</ReturnReference>
        <Explanation>THE ASSOCIATION IS ORGANIZED WITH MEMBERS. THE MEMBERSHIP CONSISTS OF ACTIVE, SENIOR, EMERITUS, AND HONORARY CLASSES.</Explanation>
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      <GeneralExplanation>
        <Identifier>ELECTION OF MEMBERS AND THEIR RIGHTS</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 7A</ReturnReference>
        <Explanation>ELECTION MAY BE BY RETURN BALLOT. A THREE-QUARTERS (3/4) AFFIRMATIVE VOTE OF THE ACTIVE, SENIOR, AND EMERITUS MEMBERS, RESPONDING BY THE DEADLINE DATE SHALL BE NECESSARY FOR ELECTION TO MEMBERSHIP. A CANDIDATE THUS REJECTED MAY AGAIN BE PROPOSED FOR MEMBERSHIP AT THE END OF THREE (3) YEARS. TO FULFILL THE CRITERIA FOR MEMBERSHIP, A NEWLY ELECTED MEMBER MUST PRESENT A PAPER WITHIN TWO (2) MEETINGS FOLLOWING ELECTION TO MEMBERSHIP. THE MEMBERSHIP COMMITTEE SHALL DISTRIBUTE A SCHEDULE OF DEADLINES ON AN ANNUAL BASIS.</Explanation>
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      <GeneralExplanation>
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        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 11B</ReturnReference>
        <Explanation>AN INDEPENDENT CERTIFIED PUBLIC ACCOUNTING FIRM (CPA) PREPARES THE ASSOCIATION'S FORM 990 AND SUBMITS THE FORM TO THE ASSOCIATION'S MANAGEMENT COMPANY FOR REVIEW. WITHIN THE MANAGEMENT COMPANY, THE FORM IS REVIEWED BY A CERTIFIED PUBLIC ACCOUNTANT WITH EXTENSIVE NONPROFIT ACCOUNTING EXPERIENCE. THE MANAGEMENT COMPANY SUBMITS THE FORM TO THE ASSOCIATION'S TREASURER FOR REVIEW. AN ELECTRONIC COPY OF THE FORM IS ALSO PROVIDED TO ALL VOTING MEMBERS OF THE BOARD FOR REVIEW. QUESTIONS AND COMMENTS ON THE FORM BY THE TREASURER AND BOARD MEMBERS ARE DIRECTED BACK TO THE CPA AND INTERNAL ACCOUNTANT FOR RESOLUTION. AFTER ALL DISCUSSION POINTS ARE RESOLVED, THE FORMS ARE FINALIZED AND PROVIDED TO THE TREASURER FOR FINAL REVIEW AND SIGNATURE. THE FORM 990 IS ALSO ATTACHED TO THE ILLINOIS FORM AG-990-IL WHICH REQUIRES THE SIGNATURE OF TWO OFFICERS. THIS PROVIDES THE OPPORTUNITY FOR A FINAL REVIEW OF THE FORM BY A SECOND OFFICER.</Explanation>
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        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 12C</ReturnReference>
        <Explanation>THE ASSOCIATION'S MANAGEMENT COMPANY ANALYZES AMOUNTS DUE FROM OR TO ANY OFFICER, DIRECTOR, OR MEMBER OF A COMMITTEE WITH GOVERNING BOARD DELEGATED POWERS TO DETERMINE AMOUNTS PAID TO OR RECEIVED FROM SUCH PERSON. THE ASSOCIATION'S MANAGEMENT COMPANY ALSO SUBMITS A QUESTIONNAIRE ANNUALLY TO SUCH PERSON WITH THE QUESTIONS DESIGNED TO DETECT ANY VIOLATION OF THE CONFLICT OF INTEREST POLICY. THE MANAGMENT COMPANY THEN PREPARES A REPORT OF ITS FINDINGS AND PRESENTS IT TO THE BOARD OF DIRECTORS.</Explanation>
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      <GeneralExplanation>
        <Identifier>COMPENSATION PROCESS FOR TOP OFFICIAL</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 15A</ReturnReference>
        <Explanation>THE ASSOCIATION'S MANAGEMENT COMPANY PREPARES A REPORT OF THE COMPENSATION. THE REPORT IS ACCOMPANIED BY THE MANAGEMENT COMPANY'S PRESENTATION OF COMPARABLE COMPENSATION FOR SIMILARLY QUALIFIED PERSONS IN FUNCTIONALLY COMPARABLE POSITIONS AT SIMILARLY SITUATED ORGANIZATIONS. THE BOARD OF DIRECTORS REVIEWS THE REPORT, EXCEPT THAT ANY BOARD MEMBER WITH A CONFLICT OF INTEREST WITH RESPECT TO THE COMPENSATION ARRANGEMENT AT ISSUE IS NOT INVOLVED IN THIS REVIEW AND APPROVAL. THERE IS A CONTEMPORANEOUS DOCUMENTATION AND RECORDKEEPING WITH RESPECT TO THE BOARD'S DELIBARATIONS AND DECISIONS.</Explanation>
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      <GeneralExplanation>
        <Identifier>COMPENSATION PROCESS FOR OFFICERS</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 15B</ReturnReference>
        <Explanation>THE PROCESS IS IDENTICAL TO THAT FOR THE CEO, EXECUTIVE DIRECTOR, OR TOP MANAGEMENT OFFICIAL.</Explanation>
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      <GeneralExplanation>
        <Identifier>GOVERNING DOCUMENTS DISCLOSURE EXPLANATION</Identifier>
        <ReturnReference>FORM 990, PAGE 6, PART VI, LINE 19</ReturnReference>
        <Explanation>DOCUMENTS ARE AVAILABLE UPON REQUEST</Explanation>
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