510(k) · Cleared
ClearedNatural-Knee II Revision Femoral Spacer Lugs
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Intermedics Orthopedics · JWH Prosthesis, Knee, Patellofemorotibial, Semi-Constrained, Cemented, Polymer/Metal/Polymer
Cleared on Apr 30, 1997 after a 79-day review. The FDA summary names its predicate without a number. 6 later devices descend from it.
- Decided
- Apr 30, 1997
- Review
- 79 days
- Class
- Class II
- Product code
- JWH
- Recalls
- None
- Predicates
- 0
6 later devices descend from it, 1 citing it directly.
- This deviceK970498 Natural-Knee II Revision Femoral Spacer LugsIntermedics Orthopedics · 1997
- Descendant · cites it directly · 5 of its ownK173057 Zimmer Knee Joint Replacement Prostheses MR LabelingZimmer, Inc. · 2018 · Recalled
- Descendant · 2 generations on · 4 of its ownK181947 Persona Revision Knee SystemZimmer, Inc. · 2018 · Recalled
- Descendant · 2 generations on · 1 of its ownK191625 Persona Revision Knee SystemZimmer, Inc. · 2019 · Recalled
- Descendant · 3 generations on · 0 of its ownK243724 Persona® Revision Knee System (Persona Revision SoluTion™ Femoral…Zimmer, Inc. · 2025
- Descendant · 3 generations on · 0 of its ownK210829 Persona Revision Knee System Femoral Metaphyseal ConesZimmer, Inc. · 2021
Showing 5 of 6 descendants. See all descendants
Descendants cleared per year
Most influential descendants
Showing 5 of 6 · See all- K173057Zimmer Knee Joint Replacement Prostheses MR LabelingZimmer, Inc. · 2018 · cites it directly5descendants
- K181947Persona Revision Knee SystemZimmer, Inc. · 2018 · 2 generations on4descendants
- K191625Persona Revision Knee SystemZimmer, Inc. · 2019 · 2 generations on1descendant
- K243724Persona® Revision Knee System (Persona Revision SoluTion™ Femoral Components)Zimmer, Inc. · 2025 · 3 generations on0descendants
- K210829Persona Revision Knee System Femoral Metaphyseal ConesZimmer, Inc. · 2021 · 3 generations on0descendants
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| 0 (this device) | K970498 | Natural-Knee II Revision Femoral Spacer Lugs | Intermedics Orthopedics | 1997 | — |
| +1 | K173057 | Zimmer Knee Joint Replacement Prostheses MR Labeling | Zimmer, Inc. | 2018 | 2 |
| +2 | K181947 | Persona Revision Knee System | Zimmer, Inc. | 2018 | 1 |
| +2 | K191625 | Persona Revision Knee System | Zimmer, Inc. | 2019 | 1 |
| +3 | K243724 | Persona® Revision Knee System (Persona Revision SoluTion™ Femoral Components) | Zimmer, Inc. | 2025 | — |
| +3 | K210829 | Persona Revision Knee System Femoral Metaphyseal Cones | Zimmer, Inc. | 2021 | — |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2018 | 2 | 0 |
| 2019 | 1 | 0 |
| 2021 | 2 | 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 JWH? 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 JWH device
- #1 K221479 Persona Personalized Knee Systemscore 22.4 · 11 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (3)
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 |
|---|---|---|---|
| * | — | Smith & Nephew Richards Genesis and Tricon-M FlexLok Pegs Named without a submission number | |
| * | — | Smith & Nephew Richards Genesis Modular Femoral Lugs Named without a submission number | |
| * | — | Howmedica Duracon Modular Femoral Pegs Named without a submission number |
What descends from it? (6)
1 later device cites it directly; ranked here by how many devices descend from each in turn.
| Number | Device | Decided | Descendants |
|---|---|---|---|
| K173057 | Zimmer Knee Joint Replacement Prostheses MR Labeling | 2018 | 5 |
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, K173057 (Zimmer, Inc., 2018) has gone furthest, with 5 descendants of its own.
How does its category compare?
All JWH devicesJWH Prosthesis, Knee, Patellofemorotibial, Semi-Constrained, Cemented, Polymer/Metal/Polymer: FDA decisions, review times, recalls and adverse event reports over 20 years.
FDA decisions per year · JWH
20in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · JWH
55in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · JWH
2in 2025
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · JWH
9,306in 2025
MAUDE reports naming product code JWH, 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 | 18 | 74 | 14 | 1,305 |
| 2008 | 17 | 81 | 10 | 1,483 |
| 2009 | 11 | 168 | 109 | 1,870 |
| 2010 | 19 | 85 | 32 | 3,286 |
| 2011 | 25 | 87 | 27 | 5,133 |
| 2012 | 33 | 85 | 85 | 5,203 |
| 2013 | 31 | 128 | 31 | 6,135 |
| 2014 | 33 | 98 | 13 | 6,722 |
| 2015 | 27 | 87 | 11 | 6,881 |
| 2016 | 18 | 88 | 17 | 7,586 |
| 2017 | 25 | 118 | 61 | 12,263 |
| 2018 | 25 | 90 | 14 | 14,071 |
| 2019 | 28 | 133 | 5 | 14,987 |
| 2020 | 22 | 59 | 2 | 12,592 |
| 2021 | 24 | 61 | 8 | 9,408 |
| 2022 | 17 | 56 | 12 | 8,364 |
| 2023 | 20 | 57 | 67 | 8,947 |
| 2024 | 19 | 89 | 7 | 10,828 |
| 2025 | 20 | 55 | 2 | 9,306 |
| 2026 | 12 | 63 | 4 | — |
What is it indicated for?
The Natural-Knee II Revision Femoral Spacer Lugs are intended for cemented use with the previously cleared Natural-Knee II Revision Femoral Component and associated components (e.g., tibial, patellar, etc.) in the treatment of:
1. Patient conditions of noninflammatory degenerative joint disease (NIDJD), e.g., avascular necrosis, osteoarthritis, and inflammatory joint disease (IJD), e.g., theumatoid arthritis.
2. Correctable valgus-varus deformity and moderate flexion contracture.
3. Those patients with failed previous surgery where pain, deformity or dysfunction persists.
4, Revision of previously failed knee arthroplasty.
Indications for use read by OCR from a scanned FDA summary, so letters may be misread. Check the PDF before quoting it.
https://510kreport.com/device/K970498 · printed Nov 4, 2026
Cite this page
510(k) Report. “K970498: Natural-Knee II Revision Femoral Spacer Lugs.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 4, 2026. https://510kreport.com/device/K970498
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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