The Prophecy® Preoperative Navigation Alignment System is intended to be used as patient specific surgical instrumentation to assist in the positioning of total ankle replacement components intraoperatively, in guiding the marking of bone before cutting, and in the pre-surgical planning of the ankle and surrounding anatomy to support the total ankle implant. The Prophecy® Preoperative Navigation Alignment Guides and Reports are intended for use with the Inbone®, Infinity® and Invision® Total Ankle Systems and their cleared indications for use, provided that anatomic landmarks necessary for alignment and positioning of the implant are identifiable on patient imaging scans. The Prophecy® Preoperative Navigation Alignment Guides are intended for single use only.
Device Story
System assists orthopedic surgeons in total ankle replacement planning and intraoperative component positioning. Inputs: patient CT scans. Process: web-based Prophecy® 3D Planner software allows surgeons to modify implant type, size, and orientation; software performs image segmentation and converts DICOM to .STL files; patient-specific alignment guides and bone models are 3D printed. Output: preoperative reports and patient-specific surgical guides. Used in clinical settings by surgeons to guide bone marking and instrument placement. Benefits: improved surgical planning and alignment accuracy for total ankle arthroplasty.
Clinical Evidence
No clinical data; substantial equivalence supported by bench testing, software verification, software validation, and usability testing.
Technological Characteristics
System utilizes 3D-printed patient-specific alignment guides and bone models. Software components include web-based 3D planning application for image segmentation and guide design. Connectivity: web-based application. Software class: validated COTS applications for DICOM to .STL conversion and design.
Indications for Use
Indicated for patients undergoing total ankle replacement surgery using Inbone®, Infinity®, or Invision® systems where anatomic landmarks for alignment are identifiable on imaging scans.
Regulatory Classification
Identification
An ankle joint metal/polymer semi-constrained cemented prosthesis is a device intended to be implanted to replace an ankle joint. The device limits translation and rotation in one or more planes via the geometry of its articulating surfaces and has no linkage across-the-joint. This generic type of device includes prostheses that have a talar resurfacing component made of alloys, such as cobalt-chromium-molybdenum, and a tibial resurfacing component made of ultra-high molecular weight polyethylene and is limited to those prostheses intended for use with bone cement (§ 888.3027).
Predicate Devices
Prophecy® Preoperative Navigation Alignment System (K202815)
Reference Devices
Blueprint™ Patient Specific Instrumentation (K203315)
Submission Summary (Full Text)
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Image /page/0/Picture/0 description: The image shows the logo of the U.S. Food and Drug Administration (FDA). On the left is the Department of Health & Human Services logo. To the right of that is the FDA logo, with the letters "FDA" in a blue square. To the right of the blue square is the text "U.S. FOOD & DRUG ADMINISTRATION" in blue.
January 27, 2023
Wright Medical Technology, Inc. Paxia Her Staff Regulatory Affairs Specialist 10801 Nesbitt Ave S. Bloomington, Minnesota 55437
Re: K222835
Trade/Device Name: Prophecy® Preoperative Navigation Alignment System Regulation Number: 21 CFR 888.3110 Regulation Name: Ankle Joint Metal/Polymer Semi-Constrained Cemented Prosthesis Regulatory Class: Class II Product Code: HSN, OYK, PBF Dated: January 9, 2023 Received: January 10, 2023
Dear Paxia Her:
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,
Ting Song -S
Ting Song, Ph.D. 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
Enclosure
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# Indications for Use
510(k) Number (if known) K222835
#### Device Name
Prophecy® Preoperative Navigation Alignment System
#### Indications for Use (Describe)
The Prophecy® Preoperative Navigation Alignment System is intended to be used as patient specific surgical instrumentation to assist in the positioning of total ankle replacement components intraoperatively, in guiding the marking of bone before cutting, and in the pre-surgical planning of the ankle and surrounding anatomy to support the total ankle implant. The Prophecy® Preoperative Navigation Alignment Guides and Reports are intended for use with the Inbone®, Infinity® and Invision® Total Ankle Systems and their cleared indications for use, provided that anatomic landmarks necessary for alignment and positioning of the implant are identifiable on patient imaging scans. The Prophecy® Preoperative Navigation Alignment Guides are intended for single use only.
| Type of Use (Select one or both, as applicable) | |
|-------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------|
| <label><input checked="" type="checkbox"/> Prescription Use (Part 21 CFR 801 Subpart D)</label> | <label><input type="checkbox"/> Over-The-Counter Use (21 CFR 801 Subpart C)</label> |
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Image /page/3/Picture/1 description: The image is a logo for Wright. The logo has two geometric shapes on the left, one red and one orange. To the right of the shapes is the word "WRIGHT" in red, and below that is the phrase "FOCUSED EXCELLENCE" in a smaller, gray font.
1023 Cherry Road Memphis, TN 38117 wright.com
# 510(K) SUMMARY OF SAFETY AND EFFECTIVENESS
In accordance with the Food and Drug Administration Rule to implement provisions of the Safe Medical Devices Act of 1990 and in conformance with 21 CFR 807.92, this information serves as a Summary of Safety and Effectiveness for the PROPHECY® Preoperative Navigation Alignment System.
| (a)(1). Submitted By: | Wright Medical Technology, Inc.<br>1023 Cherry Road<br>Memphis, TN 38117 |
|------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Date: | September 9, 2022 |
| Contact Person: | Paxia Her<br>Staff Regulatory Affairs Specialist |
| (a)(2). Proprietary Name: | Prophecy® Preoperative Navigation Alignment<br>System |
| Common Name: | Alignment guides & 3D planning software |
| Classification Name and Reference: | 21 CFR 888.3110 - Class II - Ankle joint<br>metal/polymer semi-constrained cemented<br>prosthesis<br>21 CFR 888.3030 – Class II – Orthopaedic<br>Surgical Planning and Instrument Guides |
| Device Product Code, Device Panel: | HSN, OYK, PBF |
| (a)(3). Primary Predicate Device: | K202815 - Prophecy® Preoperative Navigation<br>Alignment System |
| Reference Device: | K203315 - Blueprint™ Patient Specific<br>Instrumentation |
# (a)(4). Device Description
The Prophecy® Preoperative Navigation Alignment System is composed of three components:
- Prophecy® patient-specific guides ●
- The Prophecy® Preoperative Navigation Alignment guides are patient-specific o devices that are designed based on preoperative planning software and assist surgeons in transferring their preoperative plan to surgery by guiding the marking of bone and/or guiding surgical instruments.
- . Prophecy® 3D Planner
- The Prophecy® 3D Planner software is a web-based application. The user O interface software is intended to be used by orthopedic surgeons, as a preoperative planning and intraoperative viewing software for total ankle replacement surgery.
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- Prophecy® Preoperative report ●
- The Prophecy® Preoperative reports are patient-specific reports created from O imaging scans to provide surgeons a template of the patient's distal tibial and proximal talar anatomy and offers relevant information for a successful total ankle replacement surgery.
The Prophecy® Preoperative Navigation Alignment System is compatible with the Inbone™, InfinityTM, and Invision™ Total Ankle Systems.
## (a)(5). Indications for Use
The subject device indication for use is identical to the predicate device.
The Prophecy® Preoperative Navigation Alignment System is intended to be used as patientspecific surgical instrumentation to assist in the positioning of total ankle replacement components intraoperatively, in guiding the marking of bone before cutting, and in the presurgical planning of the ankle and surrounding anatomy to support the total ankle implant. The Prophecy® Preoperative Navigation Alignment Guides and Reports are intended for use with the Inbone™, Infinity™ and Invision™ Total Ankle Systems and their cleared indications for use, provided that anatomic landmarks necessary for alignment and positioning of the implant are identifiable on patient imaging scans. The Prophecy® Preoperative Navigation Alignment Guides are intended for single use only.
# (a)(6). Technological Characteristics Comparison
The subject device and predicate device have the same key technological characteristics as follows:
- . The system processes original patient medical images (i.e., CT scans) and produces patient-specific digital outputs to create a preoperative report and patient specific alignment guides.
- . Validated commercially off-the-shelf software applications are used for image segmentation, transfer of patient imaging from a DICOM format to an .STL format, and guide design.
- . Requires trained employees/engineers to manipulate data, using software applications.
- Surgeon works with employees/engineers by providing inputs for implant alignment, implant size and implant type modifications.
- . Patient-specific alignment guides and bone models are 3D printed via additive manufacturing as the physical output devices.
- . Preoperative case reports are produced as an output for planning total ankle replacement surgeries.
The subject device. Prophecy® Preoperative Navigation Alignment System, is substantially equivalent in materials and performance characteristics to the predicate device.
- . The modifications do not affect the device's intended use.
- . No changes to the patient-specific alignment guides, preoperative report, or other software components are proposed by this submission.
This submission proposes the following modifications to the subject device:
- Addition of the Prophecy® 3D Planner software, which gives surgeons the ability to ● modify the implant type, implant size and implant orientation via a user interface.
- Changes to the Guide Design Process due to addition of the Prophecy® 3D Planner ● software.
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The technological differences between the subject and predicate devices are supported with verification and validation evaluations. The differences in design specifications do not raise any new questions of safety and effectiveness over the predicate, which is demonstrated in the performance testing and process validation.
# (b)(1). Substantial Equivalence - Non-Clinical Evidence
Performance data and information demonstrating the safety and effectiveness of the Prophecy® Navigation Alignment System with the 3D Planner software is supported by testing that was conducted in-house. This submission includes the following non-clinical testing:
- Software verification testing to ensure all design outputs meet all specified requirements. .
- Software validation to ensure software specifications conform to user needs and intended ● uses.
- . Usability test to ensure the software is safe and effective for the intended users, uses and use environments.
The software verification and validation were performed in accordance with FDA Guidance Document "Guidance for the Content of Premarket Submissions for Software Contained in Medical Devices '' (issued May 11, 2005). The usability was performed in accordance with FDA guidance document "Applying Human Factors and Usability Engineering to Medical Devices" (issued February 18, 2016).
All test results met the acceptance criteria, demonstrating the subject device performs as intended and is substantially equivalent to the predicate device.
## (b)(2). Substantial Equivalence- Clinical Evidence
Clinical testing was not necessary for the determination of substantial equivalence.
### (b)(3). Substantial Equivalence- Conclusions
The subject device and predicate device share identical intended use, general design features and basic fundamental scientific technology. The differences between the subject device and predicate device do not raise any new questions of safety or effectiveness. From the evidence submitted in this Traditional 510(k), the subject device can be expected to perform at least as well as the predicate device and are substantially equivalent.
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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 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).
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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?
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.
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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.
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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.
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.