510(k) · Cleared
ClearedConformis Iuni Unicondylar Knee Replacement System
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Conformis, Inc. · HSX Prosthesis, Knee, Femorotibial, Non-Constrained, Cemented, Metal/Polymer
Cleared on Sep 6, 2012 as substantially equivalent to K111916 (Conformis, Inc., 2011) and 7 other predicates after a 63-day review. Its family tree reaches back 8 generations to 1992. 27 later devices descend from it.
- Decided
- Sep 6, 2012
- Review
- 63 days
- Class
- Class II
- Product code
- HSX
- Recalls
- None
- Predicates
- 8
Its longest line of descent runs back 8 generations to K911802 (1992). 33 ancestors in all, the oldest K880155 (1988). 27 later devices descend from it, 2 citing it directly.
- Root · 8 generations backK911802 Pmi (Patient Matched Implants) Hip Femoral CompBiomet, Inc. · 1992
- 7 generations backK033242 Knee Interpositional Mini-Repair System (Kimrs)Imaging Therapeutics, Inc. · 2003
- 6 generations backK043570 Unicondylar Knee Repair System / Conformis UcdConformis, Inc. · 2005 · Recalled
- 5 generations backK053488 Conformis Bicompartmental Knee Repair SystemConformis, Inc. · 2006
- 4 generations backK063432 Conformis Metal Backed Tibial Component (MBT)Conformis, Inc. · 2007 · Recalled
- 3 generations backK072368 Conformis Metal Backed Tibial ComponentConformis, Inc. · 2007 · Recalled
- 2 generations backK092441 Modification to: Conformis Iuni Unicondylar Knee Repair SystemConformis, Inc. · 2009
- 1 generation backK111916 Conformis Iuni Unicondylar Knee Replacement SystemConformis, Inc. · 2011
- This deviceK121974 Conformis Iuni Unicondylar Knee Replacement SystemConformis, Inc. · 2012
- Descendant · cites it directly · 25 of its ownK132640 Iuni Unicondylar Knee Replacement SystemConformis, Inc. · 2013 · Recalled
- Descendant · cites it directly · 16 of its ownK133256 Itotal Cruciate Retaining, Iuni Unicondylar Knee Replacement…Conformis, Inc. · 2014 · Recalled
- Descendant · 2 generations on · 15 of its ownK193105 iUni Unicondylar Knee Replacement System, iDuo Bicompartmental Knee…Conformis, Inc. · 2020
- Descendant · 3 generations on · 14 of its ownK201023 iTotal® Identity Posterior Stabilized Knee Replacement SystemConformis, Inc. · 2020
- Descendant · 4 generations on · 12 of its ownK203447 iTotal Identity Cruciate Retaining (CR) Total Knee Replacement…Conformis, Inc. · 2020
Showing 5 of 27 descendants. See all descendants
Descendants cleared per year
Most influential descendants
Showing 5 of 27 · See all- K132640Iuni Unicondylar Knee Replacement SystemConformis, Inc. · 2013 · cites it directly25descendants
- K133256Itotal Cruciate Retaining, Iuni Unicondylar Knee Replacement Systems, Iduo…Conformis, Inc. · 2014 · cites it directly16descendants
- K193105iUni Unicondylar Knee Replacement System, iDuo Bicompartmental Knee Repair System…Conformis, Inc. · 2020 · 2 generations on15descendants
- K201023iTotal® Identity Posterior Stabilized Knee Replacement SystemConformis, Inc. · 2020 · 3 generations on14descendants
- K203447iTotal Identity Cruciate Retaining (CR) Total Knee Replacement, iTotal Identity…Conformis, Inc. · 2020 · 4 generations on12descendants
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −8 | K911802 | Pmi (Patient Matched Implants) Hip Femoral Comp | Biomet, Inc. | 1992 | — |
| −7 | K033242 | Knee Interpositional Mini-Repair System (Kimrs) | Imaging Therapeutics, Inc. | 2003 | — |
| −6 | K043570 | Unicondylar Knee Repair System / Conformis Ucd | Conformis, Inc. | 2005 | 3 |
| −5 | K053488 | Conformis Bicompartmental Knee Repair System | Conformis, Inc. | 2006 | — |
| −4 | K063432 | Conformis Metal Backed Tibial Component (MBT) | Conformis, Inc. | 2007 | 3 |
| −3 | K072368 | Conformis Metal Backed Tibial Component | Conformis, Inc. | 2007 | 3 |
| −2 | K092441 | Modification to: Conformis Iuni Unicondylar Knee Repair System | Conformis, Inc. | 2009 | — |
| −1 | K111916 | Conformis Iuni Unicondylar Knee Replacement System | Conformis, Inc. | 2011 | — |
| 0 (this device) | K121974 | Conformis Iuni Unicondylar Knee Replacement System | Conformis, Inc. | 2012 | — |
| +1 | K132640 | Iuni Unicondylar Knee Replacement System | Conformis, Inc. | 2013 | 3 |
| +1 | K133256 | Itotal Cruciate Retaining, Iuni Unicondylar Knee Replacement Systems, Iduo… | Conformis, Inc. | 2014 | 6 |
| +2 | K193105 | iUni Unicondylar Knee Replacement System, iDuo Bicompartmental Knee Repair… | Conformis, Inc. | 2020 | — |
| +3 | K201023 | iTotal® Identity Posterior Stabilized Knee Replacement System | Conformis, Inc. | 2020 | — |
| +4 | K203447 | iTotal Identity Cruciate Retaining (CR) Total Knee Replacement, iTotal… | Conformis, Inc. | 2020 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1988 | 1 | 0 |
| 1991 | 1 | 0 |
| 1993 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 4 | 0 |
| 2002 | 3 | 0 |
| 2004 | 3 | 0 |
| 2005 | 1 | 0 |
| 2007 | 1 | 0 |
| 2010 | 1 | 0 |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2013 | 1 | 0 |
| 2014 | 1 | 0 |
| 2017 | 1 | 0 |
| 2019 | 3 | 0 |
| 2020 | 3 | 0 |
| 2021 | 9 | 0 |
| 2022 | 2 | 0 |
| 2023 | 5 | 0 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
Sources: FDA 510(k) database (decision fields), the FDA summary (predicates and indications), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in HSX? A 510(k) Report weighs predicate choices, recall history and review times for a new device like this one.
Top candidate predicates for a new HSX device
- #1 K261609 Freedom Partial Knee Systemscore 15.1 · 12 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (8)
Devices the submitter claimed this one is substantially equivalent to (*), and reference devices cited for a specific test or feature (†), as written in the FDA summary.
| Type | Number | Device | Decided |
|---|---|---|---|
| * | K111916 | Conformis Iuni Unicondylar Knee Replacement SystemSummary page 2…Product Code: HSX, OOG (Predicate Device) Regulation Number: 21 CFR 888.3520 510(k) number: K111916, K092441, K072586, K072368, K063432, K043570… | 2011 |
| * | K092441 | Modification to: Conformis Iuni Unicondylar Knee Repair SystemSummary page 2…Product Code: HSX, OOG (Predicate Device) Regulation Number: 21 CFR 888.3520 510(k) number: K111916, K092441, K072586, K072368, K063432, K043570 Smith… | 2009 |
| * | K072586 | Conformis Uni-Condylar Knee SystemSummary page 2…Product Code: HSX, OOG (Predicate Device) Regulation Number: 21 CFR 888.3520 510(k) number: K111916, K092441, K072586, K072368, K063432, K043570 Smith & Nephew… | 2007 |
| * | K072368 | Conformis Metal Backed Tibial ComponentSummary page 2…t Code: HSX, OOG (Predicate Device) Regulation Number: 21 CFR 888.3520 510(k) number: K111916, K092441, K072586, K072368, K063432, K043570 Smith & Nephew Journey U… | 2007 |
| * | K063432 | Conformis Metal Backed Tibial Component (MBT)Summary page 2…tion Number: 21 CFR 888.3520 510(k) number: K111916, K092441, K072586, K072368, K063432, K043570 Smith & Nephew Journey Unicondylar Device Class:… | 2007 |
| * | K043570 | Unicondylar Knee Repair System / Conformis UcdSummary page 2…er: 21 CFR 888.3520 510(k) number: K111916, K092441, K072586, K072368, K063432, K043570 Smith & Nephew Journey Unicondylar Device Class: 11… | 2005 |
| * | K102069 | Journey Unicondylar Tibial BaseplatesSummary page 2…Product Code: HSX Regulation Number: 21 CFR 888.3520 510(k) number: K102069 Zimmer Unicompartmental Knee System Device Class: 11… | 2010 |
| * | K033363 | Zimmer Unicompartmental Knee SystemSummary page 2…Product Code: HSX Regulation Number: 21 CFR 888.3520 510(k) number: K033363 Traditional 510(k) - ConforMIS iUni KRS - Clarification of Indications For Use Statement 19… | 2004 |
What descends from it? (27)
See all 272 later devices cite it directly; ranked here by how many devices descend from each in turn.
Has anything in its family been recalled? (0 Class I)
No FDA recall names this device.
No ancestor or descendant has a Class I recall.
What does this lineage say?
- The line of descent spans 20 years and passes through 3 companies; a new generation was cleared every 1.2 years on median.
- 14 of the 33 ancestors have a recall of any class.
- Of its descendants, K132640 (Conformis, Inc., 2013) has gone furthest, with 25 descendants of its own.
- 2 other devices also cite its predicate K111916.
How does its category compare?
All HSX devicesHSX Prosthesis, Knee, Femorotibial, Non-Constrained, Cemented, Metal/Polymer: FDA decisions, review times, recalls and adverse event reports over 20 years. 2012, this device’s year, is highlighted.
FDA decisions per year · HSX
4in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · HSX
59in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · HSX
2in 2020
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · HSX
175in 2025
MAUDE reports naming product code HSX, not matched to any one device; reports are not rates.
View these four charts as a table
| Year | Decisions | Median 510(k) review, days | Recalls (Class I) | MAUDE reports |
|---|---|---|---|---|
| 2007 | 6 | 33 | 0 | 6 |
| 2008 | 4 | 102 | 0 | 4 |
| 2009 | 2 | — | 49 | 21 |
| 2010 | 3 | 74 | 0 | 58 |
| 2011 | 1 | — | 0 | 114 |
| 2012 | 5 | 88 | 0 | 83 |
| 2013 | 2 | — | 1 | 79 |
| 2014 | 0 | — | 0 | 66 |
| 2015 | 1 | — | 0 | 57 |
| 2016 | 3 | 147 | 1 | 107 |
| 2017 | 5 | 160 | 4 | 113 |
| 2018 | 2 | — | 0 | 159 |
| 2019 | 7 | 90 | 0 | 177 |
| 2020 | 4 | 40 | 2 | 273 |
| 2021 | 7 | 81 | 0 | 240 |
| 2022 | 2 | — | 0 | 257 |
| 2023 | 1 | — | 0 | 231 |
| 2024 | 4 | 133 | 0 | 172 |
| 2025 | 4 | 59 | 0 | 175 |
| 2026 | 2 | — | 0 | — |
What is it indicated for?
The ConforMiS Unicondylar Knee Replacement System (iUni) is intended for use in one compartment of the osteoarthritic knee to replace the damaged area of the articular surface in patients with evidence of adequate healthy bone sufficient for support of the implanted components. Candidates for unicondylar knee replacement include those with: * joint impairment due to osteoarthritis or traumatic arthritis of the knee, * previous femoral condyle or tibial…
Read the full statement (111 words)
The ConforMiS Unicondylar Knee Replacement System (iUni) is intended for use in one compartment of the osteoarthritic knee to replace the damaged area of the articular surface in patients with evidence of adequate healthy bone sufficient for support of the implanted components.
Candidates for unicondylar knee replacement include those with:
* joint impairment due to osteoarthritis or traumatic arthritis of the knee,
* previous femoral condyle or tibial plateau fracture, creating loss of function,
* valgus or varus deformity of the knee,
* revision procedures provided that anatomic landmarks necessary for alignment and positioning of the implant are identifiable on patient imaging scans.
This implant is intended for cemented use only.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K121974 · printed Nov 6, 2026
Cite this page
510(k) Report. “K121974: Conformis Iuni Unicondylar Knee Replacement System.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K121974
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Record history
- FDA decision record loaded May 2, 2026
- Summary read Oct 13, 2026 (extraction version 9eaa42aa01ed)
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026