The subject devices are intended for use in Primary or Revision Partial Knee Arthroplasty.
Device Story
The Triathlon PKR System is a cemented unicompartmental knee prosthesis used in primary or revision partial knee arthroplasty. It consists of a femoral component, a tibial baseplate, and an X3 tibial insert. The device is implanted by an orthopedic surgeon to replace damaged joint surfaces in patients with osteoarthritis or post-traumatic arthritis. It functions as a mechanical replacement for the knee joint, restoring joint function and alleviating pain. The system is designed for patients where bone stock is insufficient for other reconstructive techniques or as an alternative to tibial osteotomy. The device is used in a surgical setting; the surgeon selects and implants the components based on patient anatomy and clinical need. The system provides a stable, non-constrained or semi-constrained interface to facilitate joint movement.
Clinical Evidence
No clinical data or additional testing was conducted for this submission. The device relies on testing performed in previously cleared premarket notifications.
Technological Characteristics
The system consists of a femoral component, tibial baseplate, and X3 tibial insert. It is a metal/polymer non-constrained or semi-constrained cemented prosthesis. No changes to materials, design, or technological characteristics were made in this submission.
Indications for Use
Indicated for patients with moderately disabling knee joint disease due to painful osteoarthritis or post-traumatic arthritis; revision of previous unsuccessful surgical procedures (with or without prior unicompartmental prosthesis); as an alternative to tibial osteotomy for unicompartmental osteoarthritis; and cases where bone stock is inadequate for other reconstructive techniques due to femoral condyle or tibial plateau deficiencies. Components are for use with bone cement.
Regulatory Classification
Identification
A knee joint femorotibial metal/polymer non-constrained cemented prosthesis is a device intended to be implanted to replace part of a knee joint. The device limits minimally (less than normal anatomic constraints) translation in one or more planes. It has no linkage across-the-joint. This generic type of device includes prostheses that have a femoral condylar resurfacing component or components made of alloys, such as cobalt-chromium-molybdenum, and a tibial component or components made of ultra-high molecular weight polyethylene and are intended for use with bone cement (§ 888.3027).
Predicate Devices
Triathlon PKR System X3 Tibial Inserts, 5630-G-XXX-E (K180612)
Triathlon PKR System X3 Tibial Inserts, 5630-G-XXX (K172326)
Triathlon PKR Unicompartmental Femoral Component (K172326)
Triathlon PKR Unicompartmental Tibial Baseplate (K172326)
Triathlon PKR Unicompartmental Femoral Component (K071881)
Triathlon PKR Unicompartmental Tibial Baseplate (K071881)
Submission Summary (Full Text)
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March 1, 2022
Image /page/0/Picture/1 description: The image contains the logo of the U.S. Food and Drug Administration (FDA). The logo consists of two parts: the Department of Health & Human Services seal on the left and the FDA acronym along with the full name of the agency on the right. The FDA part of the logo is in blue, with the acronym in a square and the full name written out to the right of the square.
Howmedica Osteonics Corp aka Stryker Orthopaedics Allison Byrne Regulatory Affairs Specialist 325 Corporate Dr. Mahwah, New Jersey 07430
Re: K203099
Trade/Device Name: Triathlon PKR System Regulation Number: 21 CFR 888.3520 Regulation Name: Knee joint femorotibial metal/polymer non-constrained cemented prosthesis Regulatory Class: Class II Product Code: HSX, HRY, KRR, NPJ
Dear Allison Byrne:
The Food and Drug Administration (FDA) is sending this letter to notify you of an administrative change related to your previous substantial equivalence (SE) determination letter dated October 27, 2020. Specifically, FDA is updating this SE Letter to include all product codes (HSX, HRY, KRR, NPJ) associated with the submission as an administrative correction.
Please note that the 510(k) submission was not re-reviewed. For questions regarding this letter please contact Ting Song, Ph.D., R.A.C., OHT6: Office of Orthopedic Devices, 301-796-7677, Ting.Song@fda.hhs.gov.
Sincerely,
# Ting Song -S
Ting Song, Ph.D., R.A.C. Assistant Director DHT6A: Division of Joint Arthroplasty Devices OHT6: Office of Orthopedic Devices Office of Product Evaluation and Quality Center for Devices and Radiological Health
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Image /page/1/Picture/0 description: The image contains the logo of the U.S. Food and Drug Administration (FDA). The logo includes the FDA acronym in a blue square, followed by the words "U.S. FOOD & DRUG ADMINISTRATION" in blue text. To the left of the FDA logo is the Department of Health & Human Services logo. The logos are aligned horizontally.
October 27, 2020
Howmedica Osteonics Corp., aka Stryker Orthopaedics Allison Byrne Regulatory Affairs Specialist 325 Corporate Dr. Mahwah, New Jersey 07430
Re: K203099
Trade/Device Name: Triathlon PKR System Regulation Number: 21 CFR 888.3520 Regulation Name: Knee Joint Femorotibial Metal/Polymer Non-Constrained Cemented Prosthesis Regulatory Class: Class II Product Code: HSX Dated: October 12, 2020 Received: October 14, 2020
Dear Allison Byrne:
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate 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. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database located at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. 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. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to 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
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requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting of medical device-related adverse events) (21 CFR 803) for devices or postmarketing safety reporting (21 CFR 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reportingcombination-products); good manufacturing practice requirements as set forth in the quality systems (OS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to https://www.fda.gov/medical-device-safety/medical-device-reportingmdr-how-report-medical-device-problems.
For comprehensive regulatory information about mediation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medicaldevices/device-advice-comprehensive-regulatory-assistance) and CDRH Learn (https://www.fda.gov/training-and-continuing-education/cdrh-learn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See the DICE website (https://www.fda.gov/medical-device-advice-comprehensive-regulatoryassistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).
Sincerely,
Image /page/2/Picture/6 description: The image shows a digital signature. The signature is from Peter G. Allen -S. The date of the signature is 2020.10.27, and the time is 15:54:32 -04'00'.
for Ting Song, Ph.D., R.A.C. Assistant Director DHT6A: Division of Joint Arthroplasty Devices OHT6: Office of Orthopedic Devices Office of Product Evaluation and Ouality Center for Devices and Radiological Health
Enclosure
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# Indications for Use
510(k) Number (if known) K203099
Device Name Triathlon PKR System
Indications for Use (Describe)
· Moderately disabling joint disease of the knee resulting from painful osteo- or post traumatic arthritis
· Revision of previous unsuccessful surgical procedures, either involving, or not involving, previous use of a unicompartmental knee prosthesis
· As an alternative to tibial osteotomy in patients with unicompartmental osteoarthritis
· Where bone stock is of poor quality or inadequate for other reconstructive techniques as indicated by deficiencies of the femoral condyle/tibial plateau.
These components are intended for implantation with bone cement.
Type of Use (Select one or both, as applicable)
> Prescription Use (Part 21 CFR 801 Subpart D)
Over-The-Counter Use (21 CFR 801 Subpart C)
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Section 5: 510(k) Summary K203099 page 1 of 4
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### 510(k) Summary K203099 page 2 of 4
| Sponsor | Howmedica Osteonics Corp aka Stryker Orthopaedics<br>325 Corporate Drive<br>Mahwah, NJ 07430 |
|----------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Contact Person | Allison Byrne<br>Regulatory Affairs Specialist<br>Howmedica Osteonics Corp<br>325 Corporate Drive<br>Mahwah, NJ 07430<br>(201) 831-5969 |
| Alternate Contact | Margaret Klippel<br>Chief Regulatory Affairs Specialist<br>Howmedica Osteonics Corp<br>325 Corporate Drive<br>Mahwah, NJ 07430<br>(201) 831-5559 |
| Date Prepared: | October 12th, 2020 |
| Proprietary Name: | Triathlon PKR System |
| Common Name: | Partial Knee Joint Replacement |
| Classification Name: | Knee joint femorotibial metal/polymer non-constrained cemented<br>prosthesis (21 CFR § 888.3520)<br>Knee joint femorotibial metal/polymer semi-constrained cemented<br>prosthesis (21 CFR § 888.3530)<br>Knee joint patellofemoral polymer/metal semi-constrained cemented<br>prosthesis (21 CFR § 888.3540)<br>Knee joint patellofemorotibial polymer/metal/polymer semi-<br>constrained cemented prosthesis (21 CFR § 888.3560) |
| Product Codes: | HSX; HRY; KRR; NPJ |
## Legally Marketed Devices to Which Substantial Equivalence is Claimed:
- Triathlon® PKR System X3® Tibial Inserts, 5630-G-XXX-E (K180612) ●
- Triathlon® PKR System X3® Tibial Inserts, 5630-G-XXX (K172326) .
- Triathlon® PKR Unicompartmental Femoral Component (K172326) ●
- Triathlon® PKR Unicompartmental Tibial Baseplate (K172326) ●
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### K203099 page 3 of 4
Subject devices Triathlon® PKR System X3® Tibial Inserts (5630-G-XXX), Triathlon® PKR Unicompartmental Femoral Component, and Triathlon® PKR Unicompartmental Tibial Baseplate were submitted previously in K082567 and K071881.
Device Description: The subject Triathlon® PKR System X3® Tibial Inserts (5630-G-XXX-E) are unchanged since the last premarket notification for the devices in K180612. The subject Triathlon® PKR System X3® Tibial Inserts (5630-G-XXX), Triathlon® PKR Unicompartmental Femoral Component, and Triathlon® PKR Unicompartmental Tibial Baseplate are unchanged since the last premarket notification for the devices in K172326.
The subject Triathlon® PKR System X3® Tibial Inserts (5630-G-XXX-E), Triathlon® PKR System X3® Tibial Inserts (5630-G-XXX), Triathlon® PKR Unicompartmental Femoral Component, and Triathlon® PKR Unicompartmental Tibial Baseplate are collectively referred to throughout this submission as the subject devices.
The purpose of this "Change Being Effected" premarket notification is to add a contraindication for the Triathlon® PKR X3® Tibial Inserts, Triathlon® PKR Unicompartmental Femoral Component, and Triathlon® PKR Unicompartmental Tibial Baseplate. Additionally, minor clarifications are being made to the labeling.
#### Intended Use:
The intended use of the subject devices is identical to the intended use specified in the 510(k) clearances for their respective predicate device. The subject devices are intended for use in Primary or Revision Partial Knee Arthroplasty.
#### Indications for Use:
- . Moderately disabling joint disease of the knee resulting from painful osteo- or post traumatic arthritis
- Revision of previous unsuccessful surgical procedures, either involving, or not involving, ● previous use of a unicompartmental knee prosthesis
- As an alternative to tibial osteotomy in patients with unicompartmental osteoarthritis
- . Where bone stock is of poor quality or inadequate for other reconstructive techniques as indicated by deficiencies of the femoral condyle/tibial plateau.
These components are intended for implantation with bone cement.
## Summary of Technological Characteristics:
Neither the addition of the contraindication for which this "Change Being Effected" premarket notification is being submitted, nor the minor labeling clarifications, will change the technological characteristics of the subject devices.
#### Non-Clinical or Clinical Testing:
No additional testing was conducted for this submission, as the only changes being made are the addition of a contraindication and minor labeling clarifications. Testing performed in the previously cleared premarket notifications is applicable to this submission.
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#### Conclusion:
The subject devices are substantially equivalent to their identified predicate device. The subject devices are identical in intended use, indications, design, technological characteristics and operational principles as described in the last premarket notification for the subject devices. The only changes made to the subject devices are the added contraindication and minor labeling clarifications.
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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.
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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?
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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.
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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.
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Reading rule for every project: how many summaries do you read in full?
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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.
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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.
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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.
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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.
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Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
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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.
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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.