This device is indicated for primary or revision surgery for rehabilitating hips damaged as a result of noninflammatory degenerative joint disease (NIDJD) or its composite diagnoses of osteoarthritis, avascular necrosis, protrusio acetabuli, traumatic arthritis, slipped capital epiphysis, fused hip, fracture of the pelvis and diastrophic variant. This device is intended for either cemented or noncemented use.
Device Story
Modular acetabular cup system for total hip arthroplasty; replaces damaged hip joint. System comprises Tivanium (Ti-6Al-4V) shell substrate with metallurgically bonded Trabecular Metal porous outer layer. Available in diameters 38-80mm; options include screw holes (standard or cluster) or no screw holes. Tivanium screws (4.5mm/6.5mm) provide fixation. Designed for cemented or noncemented implantation. Used by orthopedic surgeons in clinical/OR settings. Provides stable acetabular component for hip reconstruction; facilitates bone fixation; restores joint function.
Clinical Evidence
No clinical data. Bench testing only; Trabecular Metal/Tivanium alloy interface tested per FDA guidance and ASTM standards to confirm integrity under physiological loads.
Indicated for primary or revision hip surgery in patients with noninflammatory degenerative joint disease (NIDJD), including osteoarthritis, avascular necrosis, protrusio acetabuli, traumatic arthritis, slipped capital epiphysis, fused hip, pelvic fracture, and diastrophic variant.
Regulatory Classification
Identification
A hip joint metal/polymer/metal semi-constrained porous-coated uncemented prosthesis is a device intended to be implanted to replace a hip 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 has a femoral component made of a cobalt-chromium-molybdenum (Co-Cr-Mo) alloy or a titanium-aluminum-vanadium (Ti-6Al-4V) alloy and an acetabular component composed of an ultra-high molecular weight polyethylene articulating bearing surface fixed in a metal shell made of Co-Cr-Mo or Ti-6Al-4V. The femoral stem and acetabular shell have a porous coating made of, in the case of Co-Cr-Mo substrates, beads of the same alloy, and in the case of Ti-6Al-4V substrates, fibers of commercially pure titanium or Ti-6Al-4V alloy. The porous coating has a volume porosity between 30 and 70 percent, an average pore size between 100 and 1,000 microns, interconnecting porosity, and a porous coating thickness between 500 and 1,500 microns. The generic type of device has a design to achieve biological fixation to bone without the use of bone cement.
Implex Hedrocel Modular Elliptical Acetabular Cup (K001039)
Submission Summary (Full Text)
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## 5 2002 SEP
## Summary of Safety and Effectiveness
K021891
page 1 of 2
| Submitter: | Zimmer, Inc.<br>P.O. Box 708<br>Warsaw, IN 46581-0708 |
|---------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Contact Person: | Fred McClure<br>Senior Associate, Regulatory Affairs<br>Telephone: (574) 372-4294<br>Fax: (574) 372-4605 |
| Date: | June 6, 2002 |
| Trade Name: | Zimmer Trabecular Metal Modular Acetabular<br>System |
| Common Name: | Acetabular component for total Hip prosthesis |
| Classification Name<br>and Reference: | Hip joint metal/polymer semi-constrained cemented<br>prosthesis; 21 CFR § 888.3350<br>Hip joint metal/polymer/metal semi-constrained<br>porous-coated uncemented prosthesis;<br>21 CFR § 888.3358 |
| Predicate Device: | <i>Trilogy</i> <sup>®</sup> Acetabular System, manufactured by<br>Zimmer, Inc., (K934765), cleared April 29, 1994;<br>and Implex Hedrocel Modular Elliptical Acetabular<br>Cup, manufactured by Implex Corp., (K001039),<br>cleared June 15, 2000. |
| Device Description: | The Zimmer Trabecular Metal Modular Acetabular<br>System is a modular acetabular cup system intended<br>to replace a hip joint and designed to achieve<br>fixation to bone either with or without the use of<br>bone cement. The system consists of a shell and<br>liner. The shell substrate is made from <i>Tivanium</i> <sup>®</sup><br>Ti-6Al-4V Alloy. The outer porous material, which<br>is metallurgically bonded to the shell substrate, is<br>made of Trabecular Metal. The Trabecular Metal<br>material has an elliptical outer diameter and a<br>hemispherical inner diameter to allow hemisphere<br>to hemisphere bonding between the Trabecular<br>Metal and the <i>Tivanium</i> substrate. |
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Intended Use:
Comparison to Predicate Device:
Performance Data (Nonclinical
and/or Clinical):
Kcd1891
page 2 of 2
Three porous acetabular shell designs are available: one with screw holes, one with cluster screw holes and one without screw holes. The shells range in diameter from 38 to 80 mm in 2mm increments. The screw holes permit the use of Tivanium Allov screws to provide immediate fixation and security. Screws are available in 4.5 and 6.5mm diameters with varying lengths. The shell incorporates a threaded polar hole to attach the cup positioner.
This device is indicated for primary or revision surgery for rehabilitating hips damaged as a result of noninflammatory degenerative joint disease (NIDJD) or its composite diagnoses of osteoarthritis, avascular necrosis, protrusio acetabuli, traumatic arthritis, slipped capital epiphysis, fused hip, fracture of the pelvis and diastrophic variant. This device is intended for either cemented or
noncemented use.
The Zimmer Trabecular Metal Modular Acetabular System incorporates the same materials, has the same intended use, and similar technological and geometrical features as the legally marketed predicate devices.
Non-Clinical Performance and Conclusions:
The Trabecular Metal/Tivanium alloy interface was tested per applicable FDA Guidance Documents and ASTM Standards and the results demonstrated that the interface will maintain its integrity under physiological loads.
Clinical Performance and Conclusions:
Clinical data and conclusions were not needed for this device.
0016
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Image /page/2/Picture/1 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 an abstract symbol that resembles a stylized caduceus or a representation of the human form.
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
5 2002 SEP
Mr. Fred McClure Senior Associate, Regulatory Affairs Zimmer, Inc. P.O. Box 708 Warsaw. IN 46581-0708
Re: K021891
Trade Name: Zimmer Trabecular Metal Modualr Acetabular System Regulation Number: 21 CFR 888.3350 and 888.3358 Regulation Name: Hip joint metal/polymer semi-constrained cemented prosthesis Hip joint metal/polymer/metal semi-constrained porous-coated uncemented prosthesis Regulatory Class: II
Product Code: JDI and LPH Dated: June 6, 2002 Received: June 7, 2002
Dear Mr. McClure:
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions 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 may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal 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 that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply 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 forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
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## Page 2 – Mr. Fred McClure
This letter will allow you to begin marketing your device as described in your Section 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate 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 and additionally 21 CFR Part 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4659. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers, International 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.
Stept Rlwdw
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
Page 1 of 1
KO21891 510(k) Number (if known):
Device Name:
Zimmer® Trabecular Metal Modular Acetabular System
Indications for Use:
This device is indicated for primary or revision surgery for rehabilitating hips damaged as a result of noninflammatory degenerative joint disease (NIDJD) or its composite diagnoses of osteoarthritis, avascular necrosis, protrusio acetabuli, traumatic arthritis, slipped capital epiphysis, fused hip, fracture of the pelvis and diastrophic variant.
This device is intended for either cemented or noncemented use.
(Please do not write below this line - Continue on another page if needed)
Concurrence of CDRH, Office of Device Evaluation (ODE)
(Division Sign-Off)
Division of General, Restorative and Neurological Devices
| 510(k) Number | K 021891 |
|---------------|----------|
|---------------|----------|
| Prescription Use X (Per 21 CFR 801.109) | OR Over-The-Counter Use (Optional Format 1-2-96) |
|-----------------------------------------|--------------------------------------------------|
|-----------------------------------------|--------------------------------------------------|
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.
