510(k) · Cleared
ClearedInsall/Burstein Constrained Total Condyl
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Zimmer, Inc. · KRO Prosthesis, Knee, Femorotibial, Constrained, Cemented, Metal/Polymer
Cleared on Mar 26, 1981 after a 28-day review. FDA has not posted a summary or statement for it, so its predicates are not known. 87 later devices descend from it.
- Decided
- Mar 26, 1981
- Review
- 28 days
- Class
- Class II
- Product code
- KRO
- Recalls
- None
- Predicates
- 0
87 later devices descend from it, 1 citing it directly.
- This deviceK810520 Insall/Burstein Constrained Total CondylZimmer, Inc. · 1981
- Descendant · cites it directly · 86 of its ownK030686 Optetrak Total Knee System - Molded Metal-Back Tibial ComponentExactech, Inc. · 2003
- Descendant · 2 generations on · 72 of its ownK100900 Motivation Knee SystemEncore Medical L.P. · 2010 · Recalled
- Descendant · 3 generations on · 35 of its ownK113756 Highly Cross Linked VE Central Peg Patella Highly Cross Linked VE…Encore Medical L.P. · 2012 · Recalled
- Descendant · 4 generations on · 33 of its ownK122870 Itotal Cruciate Retaining (CR) Knee Replacement SystemConformis, Inc. · 2013
- Descendant · 5 generations on · 30 of its ownK131467 Itotal Cruciate Retaining (CR) Knee Replacement SystemConformis, Inc. · 2013
Showing 5 of 87 descendants. See all descendants
Descendants cleared per year
Most influential descendants
Showing 5 of 87 · See all- K030686Optetrak Total Knee System - Molded Metal-Back Tibial ComponentExactech, Inc. · 2003 · cites it directly86descendants
- K100900Motivation Knee SystemEncore Medical L.P. · 2010 · 2 generations on72descendants
- K113756Highly Cross Linked VE Central Peg Patella Highly Cross Linked VE Tri-Peg Patella Highly…Encore Medical L.P. · 2012 · 3 generations on35descendants
- K122870Itotal Cruciate Retaining (CR) Knee Replacement SystemConformis, Inc. · 2013 · 4 generations on33descendants
- K131467Itotal Cruciate Retaining (CR) Knee Replacement SystemConformis, Inc. · 2013 · 5 generations on30descendants
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| 0 (this device) | K810520 | Insall/Burstein Constrained Total Condyl | Zimmer, Inc. | 1981 | — |
| +1 | K030686 | Optetrak Total Knee System - Molded Metal-Back Tibial Component | Exactech, Inc. | 2003 | — |
| +2 | K100900 | Motivation Knee System | Encore Medical L.P. | 2010 | 4 |
| +3 | K113756 | Highly Cross Linked VE Central Peg Patella Highly Cross Linked VE Tri-Peg… | Encore Medical L.P. | 2012 | 1 |
| +4 | K122870 | Itotal Cruciate Retaining (CR) Knee Replacement System | Conformis, Inc. | 2013 | — |
| +5 | K131467 | Itotal Cruciate Retaining (CR) Knee Replacement System | Conformis, Inc. | 2013 | — |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2003 | 1 | 0 |
| 2009 | 1 | 0 |
| 2010 | 1 | 0 |
| 2012 | 3 | 0 |
| 2013 | 5 | 0 |
| 2014 | 8 | 0 |
| 2015 | 3 | 0 |
| 2016 | 9 | 0 |
| 2017 | 4 | 0 |
| 2018 | 3 | 0 |
| 2019 | 4 | 0 |
| 2020 | 5 | 0 |
| 2021 | 14 | 0 |
| 2022 | 5 | 0 |
| 2023 | 9 | 0 |
| 2024 | 1 | 0 |
| 2025 | 9 | 0 |
| 2026 | 2 | 0 |
Sources: FDA 510(k) database (decision fields), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in KRO? 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 KRO device
- #1 K251665 Triathlon® Hinge Knee Systemscore 19.0 · 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?
FDA has not posted a summary or statement for it, so its predicates are not known.
What descends from it? (87)
See all 871 later device cites it directly; ranked here by how many devices descend from each in turn.
| Number | Device | Decided | Descendants |
|---|---|---|---|
| K030686 | Optetrak Total Knee System - Molded Metal-Back Tibial Component | 2003 | 86 |
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?
- Of its descendants, K030686 (Exactech, Inc., 2003) has gone furthest, with 86 descendants of its own.
How does its category compare?
All KRO devicesKRO Prosthesis, Knee, Femorotibial, Constrained, Cemented, Metal/Polymer: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · KRO
3in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · KRO
56in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · KRO
14so far in 2026, the most since 2007
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · KRO
915in 2025
MAUDE reports naming product code KRO, 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 | 1 | — | 1 | 37 |
| 2008 | 3 | 126 | 3 | 44 |
| 2009 | 3 | 86 | 8 | 66 |
| 2010 | 1 | — | 0 | 110 |
| 2011 | 2 | — | 1 | 119 |
| 2012 | 2 | — | 1 | 173 |
| 2013 | 3 | 189 | 2 | 194 |
| 2014 | 2 | — | 0 | 406 |
| 2015 | 6 | 113 | 1 | 333 |
| 2016 | 3 | 148 | 5 | 369 |
| 2017 | 1 | — | 4 | 543 |
| 2018 | 0 | — | 1 | 614 |
| 2019 | 3 | 244 | 0 | 759 |
| 2020 | 1 | — | 0 | 749 |
| 2021 | 3 | 57 | 1 | 770 |
| 2022 | 1 | — | 0 | 892 |
| 2023 | 4 | 148 | 0 | 746 |
| 2024 | 3 | 87 | 0 | 855 |
| 2025 | 3 | 56 | 1 | 915 |
| 2026 | 1 | — | 14 | — |
https://510kreport.com/device/K810520 · printed Nov 6, 2026
Cite this page
510(k) Report. “K810520: Insall/Burstein Constrained Total Condyl.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K810520
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Record history
- FDA decision record loaded May 2, 2026
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026