Nonprofit · EIN 23-7379132
INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED
Also known as ISAKOS
Tax-exempt · DANVILLE, CA 94526
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2024 | 990 | $2,187,602 | $2,754,983 | -$567,381 | $12,863,433 | $2,038,121 | $10,825,312 |
| December 31, 2023 | 990 | $5,013,901 | $5,216,752 | -$202,851 | $12,387,698 | $1,325,071 | $11,062,627 |
Financial details: 990 for the year ended December 31, 2024
Revenue
- Contributions, gifts and grants
- $213,999
- Program service revenue
- $1,326,776
- Investment income
- $618,875
- Royalties
- $27,872
- Net gain from sales of assets
- $253,746
- Other revenue
- $27,952
Expenses
- Grants and similar amounts paid
- $31,990
- Compensation of officers, directors and key employees
- $385,684
- Other salaries and wages
- $549,850
- Salaries, compensation and benefits (total)
- $1,450,033
- Professional fundraising fees
- $0
- Legal fees
- $10,282
- Accounting fees
- $18,250
- Depreciation
- $3,410
- Program services (functional)
- $2,076,185
- Management and general (functional)
- $678,798
Balance sheet and other
- Total assets, start of year
- $12,387,698
- Total assets, end of year
- $12,863,433
- Total liabilities, end of year
- $2,038,121
- Net assets, end of year
- $10,825,312
- Land, buildings and equipment
- $397
- Publicly traded securities
- $11,580,683
- Net assets without donor restrictions
- $10,825,312
- Gross receipts
- $3,885,776
- Employees
- 8
- Volunteers
- 26
- Year formed
- 1974
- State of legal domicile
- PA
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended December 31, 2024, highest compensation first.
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| SUE J REIMBOLD | CEO-EXECUTIVE DIRECTOR Officer | 40 | $327,557 | $58,127 |
| LAURA ETTINGER | DIRECTOR OF EDUCATION Highest-paid employee | 40 | $118,115 | $58,091 |
| HILARY MERLINER | SR. DIR. OF OPERATIONS & STRATEGIC ADVANCEMENT Highest-paid employee | 40 | $141,774 | $26,309 |
| KATHLEEN RANKIN | SR. DIR. OF CONTENT & STRATEGIC GROWTH Highest-paid employee | 40 | $123,794 | $33,845 |
| SARAH CORPUZ | CONTROLLER/DIRECTOR OF ADMINISTRATIVE SERVICES Highest-paid employee | 40 | $123,248 | $28,078 |
| DAVID PARKER | PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| GUILLERMO ARCE | PAST PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| JOAO ESPREGUIRA-MENDES | FIRST VICE PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| ROBERT MARX | SECOND VICE PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| MARK CLATWORTHY | TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| LAURIE HIEMSTRA | ASSISTANT TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| DAVID FIGUEROA | SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| SEBASTIEN LUSTIG | ASSISTANT SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| ELIZABETH ARENDT | DIRECTOR Trustee or director, Officer | 1 | $0 | $0 |
| GIAN LUIGI CANATA | DIRECTOR Trustee or director, Officer | 1 | $0 | $0 |
4 more people on this return
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| MYLES R J COOLICAN | DIRECTOR Trustee or director, Officer | 1 | $0 |
| SHUICHI MATSUDA | DIRECTOR Trustee or director, Officer | 1 | $0 |
| SETH SHERMAN | DIRECTOR Trustee or director, Officer | 1 | $0 |
| MARIA TUCA | DIRECTOR Trustee or director, Officer | 1 | $0 |
990 for the year ended December 31, 2023: 13 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| SUE J REIMBOLD | EXECUTIVE DIRECTOR Officer | 40 | $338,159 | $30,729 |
| HILARY MERLINER | SENIOR DIRECTOR OF OPERATIONS Highest-paid employee | 40 | $132,177 | $16,346 |
| KATHLEEN RANKIN | SENIOR DIRECTOR OF CONTENT & STRATEGIC GROWTH Highest-paid employee | 40 | $116,049 | $23,912 |
| SARAH J CORPUZ | FINANCE MANAGER Highest-paid employee | 40 | $115,724 | $12,188 |
| GUILLERMO R ARCE MD | PAST PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| LAURIE A HIEMSTRA MD PHD FRCSC | ASSISTANT TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| DAVID ANTHONY PARKER MBBS FRACS | PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| JOAO ESPREGUEIRA-MENDES MD PHD | FIRST VICE PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| ROBERT G MARX MD MSC FRCSC | SECOND VICE PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| DAVID FIGUEROA PROF MD | SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| MARK CLATWORTHY FRACS | TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| ALBERTO GOBBI MD | DIRECTOR Trustee or director | 1 | $0 | $0 |
| SEBASTIEN LUSTIGMD | ASSISTANT SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
Address and contacts
- Address (IRS master file)
- 15 RAILROAD AVE, DANVILLE, CA 94526-3873
- Principal officer (990 for 2024)
- DAVID PARKER, 15 RAILROAD AVE, DANVILLE, CA 94526
- Signed the 990
- SUE REIMBOLD, CEO-EXECUTIVE DIRECTOR
- Phone
- (925) 807-1197
- Website
- WWW.ISAKOS.COM
- Return prepared by
- CLIFTONLARSONALLEN LLP
California records
California keeps its own records of charities and corporations. Search them by EIN 23-7379132 or by the name INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED.
- Attorney General, Registry of Charities and Fundraisers
- Registration status and filed reports (CT-TR-1, RRF-1)
- Secretary of State, bizfile Online
- Corporation status, entity number, agent for service
- Franchise Tax Board
- Entity status letter (state tax exemption, good standing)
Mission
A NONPROFIT CORPORATION WHOSE PURPOSE IS TO ADVANCE THE WORLDWIDE EXCHANGE AND DISSEMINATION OF EDUCATION, RESEARCH AND PATIENT CARE IN ARTHROSCOPY, KNEE SURGERY AND ORTHOPAEDIC SPORTS MEDICINE.
Program accomplishments
- IKAF: IKAF 2024, THE ISAKOS KNEE ARTHROPLASTY FORUM HELD IN KYOTO, JAPAN FROM OCTOBER 31 TO NOVEMBER 1, BROUGHT TOGETHER 300+ SURGEONS, SPECIALISTS, AND GLOBAL LEADERS TO FOCUS ON THE LATEST ADVANCEMENTS IN KNEE ARTHROPLASTY. THIS DEDICATED EDUCATIONAL EVENT CREATED A UNIQUE ENVIRONMENT FOR ATTENDEES TO EXCHANGE IDEAS, LEARN NEW TECHNIQUES, AND DISCUSS CHALLENGES AND INNOVATIONS IN THE FIELD. OVER TWO CONTENTPACKED DAYS, PARTICIPANTS ENGAGED IN EXPERT LECTURES, INTERACTIVE PANEL DISCUSSIONS, CASE-BASED PRESENTATIONS, AND DEBATES ONCONTROVERSIES SUCH AS WHETHER EQUAL MEDIAL-LATERAL BALANCE IS STILL THE GOAL IN 2024. HANDS-ON VIDEO DEMONSTRATIONS, SMALL-GROUP "MEET THE EXPERT" SESSIONS, AND DISCUSSIONS PROVIDED A PRACTICAL FOCUS ON CHALLENGING CASES. CUTTING-EDGE TOPICS INCLUDING ROBOTIC-ASSISTEDSYSTEMS, ARTIFICIAL INTELLIGENCE, AND EVOLVING IMPLANT TECHNOLOGIES WERE ALSO HIGHLIGHTED. WITH ITS GLOBAL FACULTY, INTERACTIVE FORMATS, AND TARGETED SCOPE, IKAF 2024 DELIVERED A HIGH-IMPACT PROGRAM THAT ADVANCED KNOWLEDGE AND FOSTERED CONNECTIONS AMONG EARLY-CAREER SURGEONS AND ESTABLISHED EXPERTS ALIKE.Expenses $1,037,131 · revenue $443,732
- EDUCATION & RESEARCH: IN 2024, ISAKOS EDUCATIONAL AND RESEARCH PROGRAMS DELIVERED WORLDCLASSOPPORTUNITIES FOR SURGEONS TO ADVANCE THEIR KNOWLEDGE AND SKILLS WHILE FOSTERING HIGH-QUALITY INTERNATIONAL RESEARCH. PROGRAMS FEATURED A WIDE RANGE OF EDUCATIONAL FORMATSFROM STIMULATING SURGICAL DEMONSTRATIONS AND SMALL-GROUP "MEET THE EXPERT" SESSIONSTO CASE-BASED PRESENTATIONS, DEBATES ON CURRENT CONTROVERSIES, AND INTERACTIVE LECTURES AND ICLSDESIGNED TO ENGAGE AND INSPIRE. THOUSANDS OF SURGEONS WORLDWIDE PARTICIPATED IN COURSES THAT INCLUDED HANDS-ON SURGICAL SKILLS TRAINING, VIRTUAL SESSIONS, AND INPERSON MEETINGS LED BY RENOWNED ISAKOS PHYSICIAN LEADERS. THE MONTHLY ISAKOS WEBINAR SERIES, CURATED BY ISAKOS CLINICAL COMMITTEES AND LED BY INTERNATIONAL EXPERTS, DREW LIVE PARTICIPATION FROM MORE THAN 4,000 PROFESSIONALS ACROSS A BROAD SPECTRUM OF TOPICS. TO FURTHER ADVANCE SCIENTIFIC DISCOVERY, ISAKOS AWARDED $180,000 IN RESEARCH GRANTS, SUPPORTING HIGH-QUALITY PROJECTS IN KNEE SURGERY, SPORTS MEDICINE, AND ARTHROSCOPY. THESE COMPETITIVE GRANTS ENCOMPASSED FUNDING FOR NEW RESEARCHERS AND FOR THOSE WORKING IN RESOURCELIMITED COUNTRIES, ENSURING BROAD AND MEANINGFUL IMPACT. COMPLEMENTING THIS, ISAKOS FELLOWSHIPS OFFERED YOUNG PROFESSIONALS INVALUABLE OPPORTUNITIES TO OBSERVE WORLD-CLASS ORTHOPAEDIC SURGERIES, ENGAGE IN IN-DEPTH DISCUSSIONS ON PATIENT MANAGEMENT, AND COLLABORATE ON RESEARCH INITIATIVES. THE YOUNG INVESTIGATOR SCHOLARSHIP AND RESEARCH MENTORING PROGRAM FURTHER SUPPORTED EARLY-CAREER SURGEONS, WITH A PARTICULAR FOCUS ON DEVELOPING COUNTRIES, BY FOSTERING MENTOR-MENTEE RELATIONSHIPS, STIMULATING RESEARCH AND EDUCATION, AND PROMOTING ACADEMIC EXCELLENCE. THROUGH THESE INITIATIVES, ISAKOS CONTINUED TO BUILD A VIBRANT GLOBAL COMMUNITY COMMITTED TO ADVANCING ARTHROSCOPY, KNEE SURGERY, AND ORTHOPAEDIC SPORTS MEDICINE.Expenses $443,443 · grants $31,990 · revenue $883,044
- JISAKOS/PUBLISHING: THE JOURNAL OF ISAKOS (JISAKOS), AN OPEN-ACCESS, PEER-REVIEWED PUBLICATION, PROVIDED ORTHOPAEDIC SURGEONS WORLDWIDE WITH THE LATEST RESEARCH AND EVIDENCE-BASED GUIDELINES IN SPORTS MEDICINE, TRAUMATOLOGY, AND JOINT DISORDERS. IN 2024, MORE THAN 250 ARTICLES WERE PUBLISHED, MAKING JISAKOS A CRUCIAL RESOURCE FOR CLINICIANS. TO EXPAND GLOBAL PARTICIPATION, ISAKOS LAUNCHED THE JISAKOS "EXCELLENCE IN AUTHORSHIP" PROGRAM, WHICH OFFERS MENTORSHIP, METHODOLOGY SUPPORT, FEE WAIVERS, AND WEBINARS FOR RESEARCHERS IN LOW- AND MIDDLE-INCOMECOUNTRIES, WITH UP TO $30,000 INVESTED BIENNALLY. IN ADDITION, ISAKOS PUBLISHED BOOKS AND NEWSLETTERS, BRINGING ITS LIBRARY TO MORE THAN 40 TITLES, WITH NEARLY 5,000 NEWSLETTER VIEWS IN 2024. THESE EFFORTS ADVANCE GLOBAL RESEARCH, EDUCATION, AND PATIENT CARE.Expenses $595,611
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | Not on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990 on file |
IRS record
- EIN
- 23-7379132
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (509(a)(2))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 1983
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Voluntary health associations and medical disciplines (G9BZ)
- Assets (IRS master file)
- $12,863,433
- Income (IRS master file)
- $3,885,776
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2024 | $2,187,602 | $2,754,983 | $12,863,433 | XML |
| 990 | December 2023 | $5,013,901 | $5,216,752 | $12,387,698 | XML |
| 990 | December 2022 | $1,693,200 | $2,606,703 | $11,608,928 | IRS |
| 990 | December 2021 | – | – | – | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990 | December 2018 | – | – | – | IRS |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 23-7379132).
Questions about INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED
- What is the EIN of INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED?
- The employer identification number (EIN) of INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED is 23-7379132.
- Is INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1983.
- Are donations to INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED due?
- The return for tax year 2025 (the year ending December 31, 2025) is due May 15, 2026. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2024.
- Who is the principal officer of INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED?
- The 990 for the year ended December 31, 2024 names DAVID PARKER.
- Who are the officers and directors of INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED?
- The 990 for the year ended December 31, 2024 lists 19 people; 5 received compensation from the organization, the highest $327,557 (SUE J REIMBOLD, CEO-EXECUTIVE DIRECTOR).
- How much revenue does INTL SOCIETY OF ARTHROSCOPY KNEE SURGERY AND ORTHOPAEDIC SPORTS MED have?
- On its 990 for the year ended December 31, 2024 it reported revenue of $2,187,602, expenses of $2,754,983 and total assets of $12,863,433 at year end.
Other nonprofits in DANVILLE
- THE DOWN SYNDROME CONNECTION OF THE BAY AREA EIN 91-1904304 · last filed 990 for 2025
- DANVILLE DELEGANCE FOUNDATION INC EIN 26-3096910 · last filed 990 for 2025
- NATALIE GIORGI SUNSHINE FOUNDATION EIN 46-3699023 · last filed 990-PF for 2024
- CHARLIE S GENETIC JOURNEY EIN 93-4115041 · last filed 990-EZ for 2024
- JACQUELINE RUSH FOUNDATION EIN 47-4334398 · last filed 990-N for 2025
- ATHENIAN SCHOOL EIN 94-6070808 · last filed 990 for 2025
- BLACKHAWK COUNTRY CLUB EIN 94-3054609 · last filed 990 for 2024
- THE REUTLINGER COMMUNITY EIN 94-3201366 · last filed 990 for 2024
All nonprofits in DANVILLE · California · Voluntary health associations and medical disciplines