510(k) · Cleared
ClearedIdentity Imprint Porous Total Knee Replacement System, Identity Imprint Porous Cruciate Retaining Total Knee Replacement System
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Conformis, Inc. · MBH Prosthesis, Knee, Patello/Femorotibial, Semi-Constrained, Uncemented, Porous, Coated, Polymer/Metal/Polymer
Cleared on Jul 21, 2023 as substantially equivalent to K141635 (Arthrex, Inc., 2014) and 1 other predicate after a 266-day review. Its family tree reaches back 24 generations to 1981. 2 later devices descend from it.
- Decided
- Jul 21, 2023
- Review
- 266 days
- Class
- Class II
- Product code
- MBH
- Recalls
- None
- Predicates
- 2
Its longest line of descent runs back 24 generations to K810258 (1981). 316 ancestors in all. 2 later devices descend from it, 2 citing it directly.
- Root · 24 generations backK810258 Proximal Fermoral Hip ReplacementBiomet, Inc. · 1981
- 20 generations between
- 3 generations backK213389 Identity Imprint Cruciate Retaining (CR) Knee Replacement System and…Conformis, Inc. · 2021
- 2 generations backK221059 Identity Imprint Knee Replacement System (including Identity Imprint…Conformis, Inc. · 2022
- 1 generation backK221404 Identity Imprint Knee Replacement System (including Identity Imprint…Conformis, Inc. · 2022
- This deviceK223316 Identity Imprint Porous Total Knee Replacement System, Identity…Conformis, Inc. · 2023
- Descendant · cites it directly · 0 of its ownK243768 iTotal® Identity™ Cruciate Retaining 3DP Porous Knee Replacement…Restor3D, Inc. · 2025
- Descendant · cites it directly · 0 of its ownK232426 Identity Imprint Porous Cruciate Retaining (CR) Knee Replacement…Conformis, Inc. · 2023
Show all 24 generations
- Root · 24 generations backK810258 Proximal Fermoral Hip ReplacementBiomet, Inc. · 1981
- 23 generations backK974558 Salvage/Onocology Hip and Total Femur SystemBiomet, Inc. · 1998
- 22 generations backK032396 Ringloc 36MM Line and Modular Femoral HeadsBiomet, Inc. · 2003 · Recalled
- 21 generations backK050327 E-Poly (Vitamin E) Acetabular LinersBiomet, Inc. · 2005
- 20 generations backK070364 100KGY E-Poly Maxrom Acetabular LinersBiomet, Inc. · 2007
- 19 generations backK080528 E-Poly Tibial BearingsBiomet Orthopedics, Inc. · 2008
- 18 generations backK091956 Highly Cross-Linked Vitamin E Uhmwpe Tibial Inserts, Model…Encore Medical L.P. · 2010 · Recalled
- 17 generations backK103223 Highly Cross-Linked Vitamin E Uhmwpe Tibial InsertsEncore Medical L.P. · 2010
- 16 generations backK122870 Itotal Cruciate Retaining (CR) Knee Replacement SystemConformis, Inc. · 2013
- 15 generations backK131019 Itotal Cruciate Retaining (C) Knee Replacement SystemConformis, Inc. · 2013
- 14 generations backK140423 Itotal Cruciate Retaining (CR) Knee Replacement SystemConformis, Inc. · 2014 · Recalled
- 13 generations backK142161 Itotal Cruciate Retaining (CR) Knee Replacement System, Itotal…Conformis, Inc. · 2014 · Recalled
- 12 generations backK152704 iTotal Posterior Stabilized Knee Replacement System, iTotal Cruciate…Conformis, Inc. · 2015
- 11 generations backK160025 iTotal Posterior Stabilized (PS) Knee Replacement System, iTotal…Conformis, Inc. · 2016 · Recalled
- 10 generations backK161366 ConfoMIS iTotal Cruciate Retaining (CR) Knee Replacement System…Conformis, Inc. · 2016
- 9 generations backK180906 Conformis iTotal Cruciate Retaining (CR) Knee Replacement SystemConformis, Inc. · 2018 · Recalled
- 8 generations backK190562 iTotal Identity Cruciate Retaining Knee Replacement SystemConformis, Inc. · 2019
- 7 generations backK201023 iTotal® Identity Posterior Stabilized Knee Replacement SystemConformis, Inc. · 2020
- 6 generations backK203447 iTotal Identity Cruciate Retaining (CR) Total Knee Replacement…Conformis, Inc. · 2020
- 5 generations backK210191 Identity Imprint Knee Replacement SystemConformis, Inc. · 2021 · Recalled
- 4 generations backK212411 Identity Imprint Knee Replacement System (including Identity Imprint…Conformis, Inc. · 2021
- 3 generations backK213389 Identity Imprint Cruciate Retaining (CR) Knee Replacement System and…Conformis, Inc. · 2021
- 2 generations backK221059 Identity Imprint Knee Replacement System (including Identity Imprint…Conformis, Inc. · 2022
- 1 generation backK221404 Identity Imprint Knee Replacement System (including Identity Imprint…Conformis, Inc. · 2022
- This deviceK223316 Identity Imprint Porous Total Knee Replacement System, Identity…Conformis, Inc. · 2023
Most influential descendants
Showing 2 of 2 · See allView FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −24 | K810258 | Proximal Fermoral Hip Replacement | Biomet, Inc. | 1981 | — |
| −23 | K974558 | Salvage/Onocology Hip and Total Femur System | Biomet, Inc. | 1998 | — |
| −22 | K032396 | Ringloc 36MM Line and Modular Femoral Heads | Biomet, Inc. | 2003 | 3 |
| −21 | K050327 | E-Poly (Vitamin E) Acetabular Liners | Biomet, Inc. | 2005 | — |
| −20 | K070364 | 100KGY E-Poly Maxrom Acetabular Liners | Biomet, Inc. | 2007 | — |
| −19 | K080528 | E-Poly Tibial Bearings | Biomet Orthopedics, Inc. | 2008 | — |
| −18 | K091956 | Highly Cross-Linked Vitamin E Uhmwpe Tibial Inserts, Model 391/392-09_19-702_712 | Encore Medical L.P. | 2010 | 4 |
| −17 | K103223 | Highly Cross-Linked Vitamin E Uhmwpe Tibial Inserts | Encore Medical L.P. | 2010 | — |
| −16 | K122870 | Itotal Cruciate Retaining (CR) Knee Replacement System | Conformis, Inc. | 2013 | — |
| −15 | K131019 | Itotal Cruciate Retaining (C) Knee Replacement System | Conformis, Inc. | 2013 | — |
| −14 | K140423 | Itotal Cruciate Retaining (CR) Knee Replacement System | Conformis, Inc. | 2014 | 1 |
| −13 | K142161 | Itotal Cruciate Retaining (CR) Knee Replacement System, Itotal Posterior… | Conformis, Inc. | 2014 | 6 |
| −12 | K152704 | iTotal Posterior Stabilized Knee Replacement System, iTotal Cruciate Retaining… | Conformis, Inc. | 2015 | — |
| −11 | K160025 | iTotal Posterior Stabilized (PS) Knee Replacement System, iTotal Cruciate… | Conformis, Inc. | 2016 | 1 |
| −10 | K161366 | ConfoMIS iTotal Cruciate Retaining (CR) Knee Replacement System (iTotal CR KRS) | Conformis, Inc. | 2016 | — |
| −9 | K180906 | Conformis iTotal Cruciate Retaining (CR) Knee Replacement System | Conformis, Inc. | 2018 | 4 |
| −8 | K190562 | iTotal Identity Cruciate Retaining Knee Replacement System | Conformis, Inc. | 2019 | — |
| −7 | K201023 | iTotal® Identity Posterior Stabilized Knee Replacement System | Conformis, Inc. | 2020 | — |
| −6 | K203447 | iTotal Identity Cruciate Retaining (CR) Total Knee Replacement, iTotal… | Conformis, Inc. | 2020 | — |
| −5 | K210191 | Identity Imprint Knee Replacement System | Conformis, Inc. | 2021 | 1 |
| −4 | K212411 | Identity Imprint Knee Replacement System (including Identity Imprint Posterior… | Conformis, Inc. | 2021 | — |
| −3 | K213389 | Identity Imprint Cruciate Retaining (CR) Knee Replacement System and Identity… | Conformis, Inc. | 2021 | — |
| −2 | K221059 | Identity Imprint Knee Replacement System (including Identity Imprint Posterior… | Conformis, Inc. | 2022 | — |
| −1 | K221404 | Identity Imprint Knee Replacement System (including Identity Imprint Posterior… | Conformis, Inc. | 2022 | — |
| 0 (this device) | K223316 | Identity Imprint Porous Total Knee Replacement System, Identity Imprint Porous… | Conformis, Inc. | 2023 | — |
| +1 | K243768 | iTotal® Identity™ Cruciate Retaining 3DP Porous Knee Replacement System | Restor3D, Inc. | 2025 | — |
| +1 | K232426 | Identity Imprint Porous Cruciate Retaining (CR) Knee Replacement System (KRS)… | Conformis, Inc. | 2023 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1981 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 8 | 0 |
| 1992 | 7 | 0 |
| 1993 | 13 | 0 |
| 1994 | 26 | 0 |
| 1995 | 19 | 0 |
| 1996 | 22 | 0 |
| 1997 | 14 | 0 |
| 1998 | 8 | 0 |
| 1999 | 10 | 0 |
| 2000 | 16 | 0 |
| 2001 | 15 | 0 |
| 2002 | 12 | 0 |
| 2003 | 10 | 0 |
| 2004 | 12 | 0 |
| 2005 | 12 | 0 |
| 2006 | 8 | 0 |
| 2007 | 11 | 0 |
| 2008 | 6 | 0 |
| 2009 | 5 | 0 |
| 2010 | 9 | 0 |
| 2011 | 7 | 0 |
| 2012 | 13 | 0 |
| 2013 | 2 | 0 |
| 2014 | 5 | 0 |
| 2015 | 3 | 0 |
| 2016 | 3 | 0 |
| 2017 | 1 | 0 |
| 2018 | 1 | 0 |
| 2019 | 1 | 0 |
| 2020 | 1 | 0 |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2023 | 1 | 0 |
| 2025 | 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 MBH? 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 MBH device
- #1 K241597 Freedom® Total Knee System - Porous Tibial…score 20.0 · 8 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (2)
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 |
|---|---|---|---|
| * | K141635 | Arthrex Ibalance Tka SystemSummary page 5…USA Establishment Registration 2246552 Primary Predicate Device: Arthrex iBalance® TKA System Primary Predicate Device 510(k): K141635, September 3, 2014 Primary Predicate Device Product MBH: prosthesis, knee, patello/femorotibial, semi‐ Code(s):… | 2014 |
| * | K221404 | Identity Imprint Knee Replacement System (including Identity Imprint Posterior…Summary page 5…Identity Imprint Knee Replacement System Identity Imprint CR Knee Replacement System Secondary Predicate Device 510(k): K221404 Secondary Predicate Device Product JWH: prosthesis, knee, patellofemorotibial, semi‐constrained, Codes:… | 2022 |
What descends from it? (2)
2 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 42 years and passes through 4 companies; a new generation was cleared every 11 months on median.
- 112 of the 316 ancestors have a recall of any class.
- Of its descendants, K243768 (Restor3D, Inc., 2025) has gone furthest, with 0 descendants of its own.
- 2 other devices also cite its predicate K141635.
How does its category compare?
All MBH devicesMBH Prosthesis, Knee, Patello/Femorotibial, Semi-Constrained, Uncemented, Porous, Coated, Polymer/Metal/Polymer: FDA decisions, review times, recalls and adverse event reports over 20 years. 2023, this device’s year, is highlighted.
FDA decisions per year · MBH
8in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · MBH
98in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · MBH
1in 2024
Class I (5 since 2007) Class II/III not classified
Adverse event reports per year · MBH
1,561in 2025
MAUDE reports naming product code MBH, 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 | 10 | 59 | 0 | 27 |
| 2008 | 3 | 70 | 0 | 21 |
| 2009 | 3 | 209 | 2 | 89 |
| 2010 | 4 | 84 | 0 | 121 |
| 2011 | 5 | 84 | 15 | 247 |
| 2012 | 5 | 90 | 1 (1) | 370 |
| 2013 | 6 | 138 | 4 (4) | 308 |
| 2014 | 9 | 114 | 0 | 385 |
| 2015 | 8 | 100 | 0 | 955 |
| 2016 | 4 | 74 | 1 | 1,034 |
| 2017 | 4 | 115 | 9 | 1,007 |
| 2018 | 6 | 89 | 1 | 1,191 |
| 2019 | 1 | — | 1 | 1,394 |
| 2020 | 7 | 112 | 2 | 1,089 |
| 2021 | 6 | 48 | 0 | 1,539 |
| 2022 | 7 | 57 | 0 | 1,261 |
| 2023 | 6 | 94 | 2 | 1,263 |
| 2024 | 10 | 84 | 1 | 1,497 |
| 2025 | 8 | 98 | 0 | 1,561 |
| 2026 | 7 | 153 | 4 | — |
What is it indicated for?
The Identity Imprint Porous Cruciate Retaining Total Knee Replacement System is intended for use as a total knee replacement in patients with knee joint pain and disability whose conditions cannot be solely addressed by the use of a prosthetic device that treats only one or two of the three knee compartments, such as a unicondylar, patellofemoral or bicompartmental prosthesis. The Indications for Use include: • Painful joint disease due to…
Read the full statement (166 words)
The Identity Imprint Porous Cruciate Retaining Total Knee Replacement System is intended for use as a total knee replacement in patients with knee joint pain and disability whose conditions cannot be solely addressed by the use of a prosthetic device that treats only one or two of the three knee compartments, such as a unicondylar, patellofemoral or bicompartmental prosthesis.
The Indications for Use include:
• Painful joint disease due to osteoarthritis, traumatic arthritis, rheumatoid arthritis or osteonecrosis of the knee.
• Post traumatic loss of joint function.
• Moderate varus, valgus or flexion deformity in which the ligamentous structures can be returned to adequate function and stability.
• Failed osteotomies, hemiarthroplasties, and unicondylar, patellofemoral or bicompartmental implants.
• Revision procedures, provided that anatomic landmarks necessary for alignment and positioning of the implant are identifiable on patient imaging scans.
The Identity Imprint Porous Cruciate Retaining Total Knee Replacement System is intended for uncemented use, but porous implants may be used with cement if desired by the surgeon.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K223316 · printed Nov 4, 2026
Cite this page
510(k) Report. “K223316: Identity Imprint Porous Total Knee Replacement System, Identity Imprint Porous Cruciate Retaining Total Knee Replacement System.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 4, 2026. https://510kreport.com/device/K223316
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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