510(k) · Cleared
ClearedRx Knee System
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Signature Orthopaedics Pty, Ltd. · JWH Prosthesis, Knee, Patellofemorotibial, Semi-Constrained, Cemented, Polymer/Metal/Polymer
Cleared on Sep 11, 2024 as substantially equivalent to K183017 (Osteoremedies, LLC, 2019) and 4 other predicates after a 183-day review. Its family tree reaches back 7 generations to 1995. 2 later devices descend from it.
- Decided
- Sep 11, 2024
- Review
- 183 days
- Class
- Class II
- Product code
- JWH
- Recalls
- None
- Predicates
- 5
Its longest line of descent runs back 7 generations to K936159 (1995). 47 ancestors in all, the oldest P810020 (1984). 2 later devices descend from it, 2 citing it directly.
- Root · 7 generations backK936159 Natural-Knee II SystemIntermedics Orthopedics · 1995 · Recalled
- 6 generations backK032522 Tecres Spacer-K Temporary Knee ProsthesisExactech, Inc. · 2004
- 5 generations backK050210 Disposable Cement Spacer Molds for Temporary Knee ProsthesesBiomet, Inc. · 2005 · Recalled
- 4 generations backK062274 Spacer-K Temporary Knee Spacer with Gentamicin, Models SPK0021…Tecres S.P.A. · 2008
- 3 generations backK101356 Spacer-G and Spacer-KTecres S.P.A. · 2011
- 2 generations backK112470 2GC Hip/Knee Modular SpacerMandell Horwitz Consultants, LLC · 2012
- 1 generation backK183017 Remedy Femoral Component 84mm, Remedy Stemmed Knee SpacerOsteoremedies, LLC · 2019
- This deviceK240683 Rx Knee SystemSignature Orthopaedics Pty, Ltd. · 2024
- Descendant · cites it directly · 0 of its ownK260063 GSPE SpacerThe General Hospital Corporation, d/b/a Massachusetts · 2026
- Descendant · cites it directly · 0 of its ownK261734 Klassic Infection Spacer SystemTotal Joint Orthopedics, Inc. · 2026
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 |
|---|---|---|---|---|---|
| −7 | K936159 | Natural-Knee II System | Intermedics Orthopedics | 1995 | 6 |
| −6 | K032522 | Tecres Spacer-K Temporary Knee Prosthesis | Exactech, Inc. | 2004 | — |
| −5 | K050210 | Disposable Cement Spacer Molds for Temporary Knee Prostheses | Biomet, Inc. | 2005 | 8 |
| −4 | K062274 | Spacer-K Temporary Knee Spacer with Gentamicin, Models SPK0021, SPK0121… | Tecres S.P.A. | 2008 | — |
| −3 | K101356 | Spacer-G and Spacer-K | Tecres S.P.A. | 2011 | — |
| −2 | K112470 | 2GC Hip/Knee Modular Spacer | Mandell Horwitz Consultants, LLC | 2012 | — |
| −1 | K183017 | Remedy Femoral Component 84mm, Remedy Stemmed Knee Spacer | Osteoremedies, LLC | 2019 | — |
| 0 (this device) | K240683 | Rx Knee System | Signature Orthopaedics Pty, Ltd. | 2024 | — |
| +1 | K260063 | GSPE Spacer | The General Hospital Corporation, d/b/a Massachusetts | 2026 | — |
| +1 | K261734 | Klassic Infection Spacer System | Total Joint Orthopedics, Inc. | 2026 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1984 | 1 | 0 |
| 1992 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 0 |
| 2003 | 4 | 0 |
| 2004 | 3 | 0 |
| 2005 | 2 | 0 |
| 2008 | 3 | 0 |
| 2010 | 1 | 0 |
| 2011 | 1 | 0 |
| 2016 | 2 | 0 |
| 2017 | 1 | 0 |
| 2018 | 2 | 0 |
| 2019 | 1 | 0 |
| 2022 | 2 | 0 |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2026 | 2 | 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? (5)
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 |
|---|---|---|---|
| * | K183017 | Remedy Femoral Component 84mm, Remedy Stemmed Knee SpacerSummary page 5…lmethacrylate (PMMA) bone cement (MBB, 21CFR 888.3027) Primary Devices: Primary Predicate • Remedy Stemmed Knee Spacer (K183017) Predicate/Reference Device • ATTUNE Revision Fixed Bearing (K160700)… | 2019 |
| * | K160700 | ATTUNE Revision Knee SystemSummary page 5…e • Remedy Stemmed Knee Spacer (K183017) Predicate/Reference Device • ATTUNE Revision Fixed Bearing (K160700) • World Knee System (K181530, K220737, K223062) Device Description: The Rx Knee System i… | 2016 |
| * | K181530 | World Total Knee SystemSummary page 5…(K183017) Predicate/Reference Device • ATTUNE Revision Fixed Bearing (K160700) • World Knee System (K181530, K220737, K223062) Device Description: The Rx Knee System is a temporary knee device consisting of femoral, all p… | 2018 |
| * | K220737 | World Knee Vit-E All-poly Tibial Inserts (CR, PS and UC), World Knee Vit-E Meniscal…Summary page 5…) Predicate/Reference Device • ATTUNE Revision Fixed Bearing (K160700) • World Knee System (K181530, K220737, K223062) Device Description: The Rx Knee System is a temporary knee device consisting of femoral, all polyethyle… | 2022 |
| * | K223062 | World Total Knee SystemSummary page 5…Predicate/Reference Device • ATTUNE Revision Fixed Bearing (K160700) • World Knee System (K181530, K220737, K223062) Device Description: The Rx Knee System is a temporary knee device consisting of femoral, all polyethylene tibial… | 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 29 years and passes through 7 companies; a new generation was cleared every 3.3 years on median.
- 18 of the 47 ancestors have a recall of any class.
- Of its descendants, K260063 (The General Hospital Corporation, d/b/a Massachusetts, 2026) has gone furthest, with 0 descendants of its own.
- 3 other devices also cite its predicate K183017.
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. 2024, this device’s year, is highlighted.
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 patient should be skeletally mature to receive a knee replacement. The Rx Knee System is indicated for temporary use (maximum 180 days) as an adjunct to total knee replacement (TKR) in patients undergoing a two-stage procedure due to a septic process and where gentamicin is the most appropriate antibiotic based on the susceptibility pattern of the infecting micro-organism(s). The device is intended for use in conjunction with systemic antimicrobial…
Read the full statement (152 words)
The patient should be skeletally mature to receive a knee replacement. The Rx Knee System is indicated for temporary use (maximum 180 days) as an adjunct to total knee replacement (TKR) in patients undergoing a two-stage procedure due to a septic process and where gentamicin is the most appropriate antibiotic based on the susceptibility pattern of the infecting micro-organism(s).
The device is intended for use in conjunction with systemic antimicrobial therapy (standard treatment approach to an infection).
The device is intended for use with the gentamicin-loaded cement, Palacos@ G.
The Rx Knee System is not intended for use for more than 180 days, at which time it must be explanted and a permanent device implanted or another appropriate treatment performed (e.g., resection arthroplasty, fusion etc.).
The device is only indicated for patients who will consistently use traditional mobility assist devices (e.g., crutches, walkers, canes) throughout the implantation period, allowing basic joint mobility.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K240683 · printed Nov 6, 2026
Cite this page
510(k) Report. “K240683: Rx Knee System.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 6, 2026. https://510kreport.com/device/K240683
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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