The metaphyseal sleeve is intended for use in primary and revision knee joint replacement and in oncology cases. The metaphyseal sleeve is used to fill metaphyseal defects in the distal femur and joins a knee femoral component with an intramedullary stem. The sleeve may be used across several product lines: the Limb Preservation System (LPS), the S-ROM system, and the fixed platform portion of the P.F.C. Sigma system. The previously cleared indications for use for these systems: The LPS is intended for use in replacement of the mid-shaft portion of the femur, proximal, distal and/or total femur, and proximal tibia, especially in cases that require extensive resection and replacement. Specific diagnostic indications for use include: - malignant tumors (e.g., osteosarcomas, chondrosarcomas, giant cell tumors, bone tumors) . requiring extensive resection and replacement: - · patient conditions of noninflammatory degenerative joint disease (NIDJD), e.g. avascular necrosis, osteoarthritis, and inflammatory joint disease (IJD), e.g., rheumatoid drithritis, requiring extensive resection and replacement; - · revision cases for a failed previous prosthesis requiring extensive resection and replacement; - · severe trauma requiring extensive resection and replacement. The LPS is also intended for use in bone loss post-infection, where the surgeon has elected to excise the bone and replacement is required. The metaphyseal sleeve, the distal femoral component, the tibial components, and the nonporous coated straight and bowed stems are intended for cemented use only.
Device Story
Titanium metaphyseal sleeve; cone-shaped with outer stepped anatomical taper; porous coated; sizes 31-46mm. Used to fill distal femoral metaphyseal defects; connects femoral component to intramedullary stem. Compatible with Limb Preservation System (LPS), S-ROM, and P.F.C. Sigma systems. Employs adapters (wrought cobalt chrome) for mating with femoral components and stems. Used in OR by orthopedic surgeons; cemented fixation. Provides structural support for bone loss; enables modular reconstruction of knee joint in oncology and revision cases.
Clinical Evidence
No clinical data provided; bench testing only.
Technological Characteristics
Titanium construction; cone-shaped with stepped anatomical taper; porous coating on most steps. Modular design using wrought cobalt chrome adapters for femoral/stem connectivity. Cemented fixation (PMMA).
Indications for Use
Indicated for skeletal mature patients requiring primary or revision knee joint replacement or oncology-related resection. Conditions include malignant bone tumors, NIDJD (avascular necrosis, osteoarthritis), IJD (rheumatoid arthritis), post-traumatic arthritis, collagen disorders, pseudogout, severe trauma, or failed prior reconstruction. Requires resection of both cruciate ligaments or absent/incompetent cruciate ligaments. Intended for cemented use only.
Regulatory Classification
Identification
A knee joint patellofemorotibial polymer/metal/polymer semi-constrained cemented prosthesis is a device intended to be implanted to replace a knee joint. The device limits translation and rotation in one or more planes via the geometry of its articulating surfaces. It has no linkage across-the-joint. This generic type of device includes prostheses that have a femoral component made of alloys, such as cobalt-chromium-molybdenum, and a tibial component or components and a retropatellar resurfacing component made of ultra-high molecular weight polyethylene. This generic type of device is limited to those prostheses intended for use with bone cement (§ 888.3027).
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# 510(k) Summary LPS Metaphyseal Sleeve
#### A. Contact Person:
# JUL 0 9 2004
Dina L. Weissman, J.D. Legal Consultant, Regulatory Affairs TEL: (574) 371-4905, FAX (574) 371-4987, EMAIL dweissma@dpyus.jnj.com
## B. Device Information:
| Trade Name: | LPS Metaphyseal Sleeve (Limb Preservation System) |
|----------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------|
| Common Name: | Total Knee Prosthesis |
| Classification Name<br>and Regulatory Class: | Knee joint patellofemorotibial polymer/metal/polymer<br>semi-constrained cemented prosthesis: Class II per 21<br>CFR §888.3560 |
| Product Code: | 87 JWH |
## C. Indications for Use:
The metaphyseal sleeve is intended for use in primary and revision knee joint replacement and in oncology cases. The metaphyseal sleeve is used to fill metaphyseal defects in the distal femur and joins a knee femoral component with an intramedullary stem. The sleeve may be used across several product lines: the Limb Preservation System (LPS), the S-ROM system, and the fixed platform portion of the P.F.C. Sigma system. The previously cleared indications for use for these systems:
The LPS is intended for use in replacement of the mid-shaft portion of the femur, proximal, distal and/or total femur, and proximal tibia, especially in cases that require extensive resection and replacement. Specific diagnostic indications for use include:
- malignant tumors (e.g., osteosarcomas, chondrosarcomas, giant cell tumors, bone tumors) . requiring extensive resection and replacement:
- · patient conditions of noninflammatory degenerative joint disease (NIDJD), e.g. avascular necrosis, osteoarthritis, and inflammatory joint disease (IJD), e.g., rheumatoid drithritis, requiring extensive resection and replacement;
- · revision cases for a failed previous prosthesis requiring extensive resection and replacement;
- · severe trauma requiring extensive resection and replacement.
The LPS is also intended for use in bone loss post-infection, where the surgeon has elected to excise the bone and replacement is required.
The metaphyseal sleeve, the distal femoral component, the tibial components, and the nonporous coated straight and bowed stems are intended for cemented use only.
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## 510(k) Summary (continued) LPS Metaphyseal Sleeve
### C. Indications for Use (continued):
The S-ROM Modular Total Knee System was cleared as the "NOILES Posterior Stabilized Knee."
The NOILES Posterior Stabilized Knee is indicated for use with PMMA bone cement in primary or revised cases in patients:
- who have reached skeletal maturity and .
- for whom the surgeon has decided to resect both cruciate ligaments or whose cruciate . ligaments are absent or incompetent due to the following conditions: rheumatoid arthritis, osteoarthritis, post-traumatic arthritis, and arthritis secondary to a variety of diseases and anomalies, failure of a previous knee reconstruction procedure, trauma.
The P.F.C. Sigma Knee System is indicated for use as a total knee replacement for patients suffering from severe pain and disability due to permanent structural damage in the knee joint from rheumatoid arthritis, osteoarthritis, post-traumatic arthritis, collagen disorders, or pseudogout.
This damage may also be a result of trauma or failed prior surgical intervention.
The P.F.C. Sigma Knee System is indicated for use with polymethylmethacrylate (PMMA) bone cement.
#### D. Device Description:
The metaphyseal sleeve is a component to the previously cleared Limb Preservation System (LPS). The titanium sleeve is used to fill metaphyseal defects in the distal femur and joins a knee femoral component with an intramedullary stem. The sleeve is cone-shaped, with an outer stepped anatomical taper to fill the metaphyseal region of the distal femur. All but the final four steps of the sleeve are porous coated. The sleeve ranges in size from 31 to 46mm, as measured at the widest (M/L width) portion of the sleeve.
Through the use of adapters, the sleeve is compatible on its proximal and distal ends with femoral stems and distal femoral components. The femoral stems and distal femoral components are from previously cleared DePuy knee systems such as the Limb Preservation System, the S-ROM® NOILES Total Knee System and the fixed platform of the P.F.C. Σ System.
On the distal end, the sleeves either mate directly with the posts on previously cleared femoral components (e.g., the S-ROM femoral) or, through the use of one of the two wrought cobalt chrome femoral to sleeve adapters, mate with previously cleared femoral components that do not have posts (e.g., the LPS femoral, the P.F.C. Σ TC3 or the P.F.C. Σ PS femoral). These adapters will be available in 3 offsets: +0, +5 and +10 millimeters.
On the proximal side, the sleeves mate with previously cleared stems, either directly (when using an S-ROM stem) or through the use of the titanium LPS P.F.C. Stem to Sleeve Adapter (when using a P.F.C. type fluted or cemented stem).
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# Ko40281
3
# 510(k) Summary (continued) LPS Metaphyseal Sleeve
## E. Substantial Equivalence:
The substantial equivalence of the LPS is substantiated by its similarity:
- in sterilization, packaging and indications for use to the LPS (K003182 cleared on . June 27, 2001).
- in design, materials and indications for use to the femoral sleeve found in the S-. ROM/Noiles PS Total Knee System (K870730 cleared on May 26, 1987).
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Image /page/3/Picture/2 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a circular seal with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" around the perimeter. Inside the circle is a stylized emblem featuring three horizontal lines that curve upwards, resembling an abstract representation of the human form.
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
Dina L. Weissman, J.D. Legal Consultant, Regulatory Affairs DePuy, Inc. 700 Orthopaedic Drive Warsaw, Indiana 46581
JUL 0 9 2004
Re: K040281
Trade/Device Name: LPS Metaphyseal Sleeve Regulation Number: 21 CFR 888.3560 Regulation Name: Knee joint patellofemorotibial polymer/metal/polymer semiconstrained cemented prosthesis Regulatory Class: II Product Code: JWH
Dated: June 1, 2004 Received: June 3, 2004
Dear Ms. Weissman:
We have reviewed your Section 510(k) premarket notification of intent to market the device we nave teviewed your because be device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate 101 use stated in the enorouse) to regists and ment date of the Medical Device Amendments, or to connineres prior to May 20, 1978, ac excordance with the provisions of the Federal Food, Drug, de necs that have been require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. The 1 ou may, there covisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it If your device is classinod (over as controls. Existing major regulations affecting your device can may or subject to been the deral Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
Please be advised that FDA's issuance of a substantial equivalence determination does not mean I that FDA has made a determination that your device complies with other requirements of the Act that 127 Mas Intatutes and regulations administered by other Federal agencies. You must or any I with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); good manufacturing practice requirements as set
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Page 2 - Dina L. Weissman, J.D.
forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic form in the quality byections (Sections 531-542 of the Act); 21 CFR 1000-1050.
This letter will allow you to begin marketing your device as described in your Section 510(k) rms letter with and the FDA finding of substantial equivalence of your device to a legally premated predicated device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please If you atem office of Compliance at (301) 594-4659. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). You may obtain other general information on your responsibilities under the Act from the Division of Small other general mornational and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its Internet address http://www.fda.gov/cdrh/dsma/dsmamain.html
Sincerely yours,
Celia M. Witten, Ph.D., M.D.
Director Division of General, Restorative and Neurological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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# Indications for Use
K040281 510(k) Number (if known): LPS Metaphyseal Sleeve Device Name:
#### Indications for Use:
The metaphyseal sleeve is used to fill metaphyseal defects in the distal femur and joins a knee femoral I he netaphysear never is assure them. The metaphyseal sleeve is intended for use in primary and component will and in minuneout and in oncology cases across several product lines: the Limb Preservation It vision alled John ropidounten and the P.F.C. Sigma system. The previously cleared indications for use for these systems are the following:
The LPS is intended for use in replacement of the mid-shaft portion of the femur, proximal, distal and/or total femur, and proximal tibia, especially in cases that require extensive resection and replacement. Specific diagnostic indications for use include:
- · malignant tumors (e.g., osteosarcomas, chondrosarcomas, giant cell tumors, bone tumors) requiring extensive resection and replacement;
patient conditions of noninflammatory degenerative joint disease (NIDJD), e.g. avascular necrosis, . osteoarthritis, and inflammatory joint disease (IJD), e.g., rheumatoid arthritis, requiring extensive resection and replacement;
- · corevision cases for a failed previous prosthesis requiring extensive resection and replacement;
- · severe trauma requiring extensive resection and replacement.
The LPS is also intended for use in bone loss post-infection, where the surgeon has elected to excise the bone and replacement is required.
The metaphyseal sleeve, the distal femoral component, the tibial components, and the non-porous coated straight and bowed stems are intended for cemented use only.
#### (CONTINUED ON THE NEXT PAGE)
Over-The-Counter Use AND/OR Prescription Use XXXXX (Part 21 CFR 801 Subpart D) (21 CFR 807 Subpart C) (PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE OF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
Page 1 of 2 and Neurological Devices
(Posted November 13, 2003)
510(k) Number K040281
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The S-ROM Modular Total Knee System was cleared as the "NOILES Posterior Stabilized Knee." The NOILES Posterior Stabilized Knee is indicated for use with PMMA bone cement in primary or revised cases in patients:
- who have reached skeletal maturity and .
- for whom the surgeon has decided to resect both cruciate ligaments or whose cruciate ligaments are . absent or incompetent due to the following conditions: rheumatoid arthritis, osteoarthritis, posttraumatic arthritis, and arthritis secondary to a variety of diseases and anomalies, failure of a previous knee reconstruction procedure, trauma.
The P.F.C.® Sigma Knee System is indicated for use as a total knee replacement for patients suffering from severe pain and disability due to permanent structural damage in the knee joint from rheumatoid arthritis, osteoarthritis, post-traumatic arthritis, collagen disorders, or pseudogout.
This damage may also be a result of trauma or failed prior surgical intervention.
The P.F.C.® Sigma Knee System is indicated for use with polymethylmethacrylate (PMMA) bone cement.
Two short videos show you everything — or skip straight to the written tutorial if you'd rather read. You can reopen this any time from the Tutorial button in the top bar.
Part 1 — Search, results, and everyday workflows 16 min
Part 2 — Embeddings: the galaxy map 3 min
1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
Use the checkboxes above the results to narrow: SaMD keeps only software-only devices, AI / ML keeps only devices with AI.
Exact vs. fuzzy search: what's the difference?
Exact matches on the literal phrase (prefix search works, suffix does not). Fuzzy matches on the meaning and intent of the phrase rather than the exact words. Hover over the badge on any row to see why it matched.
You search "coronary artery calcification" and want only software devices with AI. What two filters do you apply?
Narrow by SaMD (software-only devices), then narrow by AI/ML (devices with AI).
2. The results table
Scroll right in the results table. The intended use is extracted for you — no need to open the PDF. The device story gives a high-level snapshot of what the device does and how it's used. The AI Performance sub-table shows each output name, acceptance criteria, observed values, and development/test dataset descriptions — the same format Innolitics uses for regulatory strategy outputs, and the fastest high-level fingerprint of an AI device. It is AI-generated but has been very reliable in practice.
Where do you find a device's intended use without opening the PDF?
Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
What does the AI Performance sub-table show, and why is it useful?
Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
3. Judging fuzzy relevance
Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
4. Device detail page: chat and citations
Click a device name to open its detail page: device facts on the left, a chat window on the right. Ask something like "Describe the training data". The answer carries little citation bubbles — click one to jump to the highlighted passage in the source PDF, so you can verify every AI answer against the document. There's also a Download PDF button for sharing.
How do you verify an AI chat answer on the device detail page?
Click the citation bubbles to jump to the relevant highlight in the source document.
Reading rule for every project: how many summaries do you read in full?
At least the three most relevant 510(k) or De Novo summaries, in full. After that, use targeted chat questions to confirm your memory quickly. The tool supports this professional habit — it doesn't replace it.
5. Side-by-side comparison
Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
What does the side-by-side PDF viewer mode do?
Select multiple devices, open the PDF viewer tab, and ask one question (e.g., "Describe the training data"). It queries all selected devices simultaneously with citations, so you can compare and contrast quickly.
6. Collections
With rows selected, go to the Collections tab and create a labeled collection (e.g., "Cobb Angle Project"). Reload that selection any time — before a client call, pull up the collection and ask questions across all of its devices at once.
How do you save a set of selected devices for later use?
Select the rows, go to the Collections tab, and create a labeled collection (e.g., "Cobb Angle Project"). You can reload the selection anytime and carry it into the PDF viewer and other tabs that support selections.
7. Product codes and the regulations tree
Click a product code in the results to jump to it in the regulations tree — identification text, sibling product codes, and devices you can open in a PDF viewer on the right. Click a regulation number to see its identification, special controls, and related product codes. You can also search by product code or regulation number at the top of the tree. Always read the special controls if any exist for your device — it broadens your search and sharpens pre-kickoff research.
What can you do from the regulations tree view?
Browse product codes and regulation numbers, read the identification text and special controls, browse sibling product codes, open device PDFs on the right, and search by product code or regulation number at the top of the tree.
8. Chart view
Click Show Chart and segment by regulation number (or product code) to see which regulations dominate your result set. Clicking a regulation takes you into the regulations tree. Great for spotting that most matches are, say, hardware laparoscopic devices — a cue to go back and filter.
How do you see which regulations dominate a search result set?
Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
9. The predicate graph
Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
In the predicate graph, why are commonly predicated devices worth reading?
A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
10. Embeddings: the galaxy map
The Embeddings tab plots every matching document in a 2-D "galaxy map" where semantically similar devices cluster together. Hover or click clusters to explore, and let AI label the clusters for you. Embeddings beat product codes for grouping: two devices can carry different product codes (LLZ vs. QIH) yet do the same thing — the embedding captures the meaning of the intended use and device story. This is also exactly how retrieval-augmented generation (RAG) works under the hood, and it makes a great visual on client calls.
Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.