Active-V Total Knee System; World Total Knee System

K253239 · Signature Orthopaedics Pty, Ltd. · MBH · Dec 23, 2025 · Orthopedic

Device Facts

• Record ID: K253239
• Device Name: Active-V Total Knee System; World Total Knee System
• Applicant: Signature Orthopaedics Pty, Ltd.
• Product Code: MBH · Orthopedic
• Decision Date: Dec 23, 2025
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 888.3565
• Device Class: Class 2
• Attributes: Therapeutic

Intended Use

The patient should be skeletally mature to receive a knee replacement. Patients should have adequate bone stock and size to support and accept the prosthesis. The patient’s needs for knee replacement should be due to one or more of the following conditions: • Non-inflammatory degenerative joint disease including osteoarthritis, traumatic arthritis or avascular necrosis • Inflammatory degenerative joint disease including rheumatoid arthritis • Functional deformity such as varus, valgus or flexion deformities • Revision procedures where other treatments or device have failed • Fractures that are unmanageable using other techniques Signature Orthopaedics’ World Knee/Active-V Knee replacement components may be intended for cemented or cementless use.

Device Story

Modular total knee replacement system; includes femoral components, meniscal inserts, patella, tibial baseplates, and external tibial augments. Designed for cemented or cementless fixation. Femoral components (CoCrMo alloy) and tibial components (Ti6Al4V alloy) provide structural support; meniscal inserts (Vitamin-E stabilized UHMWPE) provide bearing surfaces. Used by orthopedic surgeons in clinical settings to replace damaged knee joints. Device restores joint function, corrects deformities, and alleviates pain associated with degenerative or inflammatory joint disease. Surgeon selects components based on patient anatomy and pathology; implants are secured to bone to facilitate joint articulation. Benefits include improved mobility and pain relief for patients with severe knee pathology.

Clinical Evidence

Bench testing only. Engineering evaluations performed on worst-case sizes included Finite Element Analysis (FEA) of the tibial baseplate and Range of Motion (ROM) analysis for constrained condylar knee (CCK) and medial-constrained (MC) variants. No clinical data provided.

Technological Characteristics

Materials: Cast CoCrMo alloy (femoral), Ti6Al4V alloy (tibial/augment), Vitamin-E stabilized UHMWPE (inserts/patella). Coatings: Plasma sprayed commercially pure titanium, hydroxyapatite, optional titanium nitride. Design: Modular, anatomical femoral, symmetrical tibial tray. Fixation: Cemented or cementless. Sterilization: Not specified. Connectivity: None.

Indications for Use

Indicated for skeletally mature patients requiring total knee replacement due to non-inflammatory degenerative joint disease (osteoarthritis, traumatic arthritis, avascular necrosis), inflammatory degenerative joint disease (rheumatoid arthritis), functional deformity (varus, valgus, flexion), revision procedures, or unmanageable fractures. Requires adequate bone stock.

Regulatory Classification

Identification

A knee joint patellofemorotibial metal/polymer porous-coated uncemented 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 is designed to achieve biological fixation to bone without the use of bone cement. This identification includes fixed-bearing knee prostheses where the ultra high molecular weight polyethylene tibial bearing is rigidly secured to the metal tibial base plate.

Special Controls

*Classification.* Class II (special controls). The special control is FDA's guidance: “Class II Special Controls Guidance Document: Knee Joint Patellofemorotibial and Femorotibial Metal/Polymer Porous-Coated Uncemented Prostheses; Guidance for Industry and FDA.” See § 888.1 for the availability of this guidance.

Predicate Devices

• Signature Orthopaedics, World Total Knee System (K181530)
• Signature Orthopaedics, World Total Knee System (K223062)
• Signature Orthopaedics, Triverse Total Knee System (K222380)
• Signature Orthopaedics, World Total Knee System (K220737)

Reference Devices

• Signature Orthopaedics, Rx Knee System (K243680)

Submission Summary (Full Text)

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FDA U.S. FOOD & DRUG ADMINISTRATION

December 23, 2025

Signature Orthopaedics Pty, Ltd.
Declan Brazil, Managing Director
7 Sirius Rd.
Lane Cove West, NSW 2066
Australia

Re: K253239
Trade/Device Name: Active-V Total Knee System; World Total Knee System
Regulation Number: 21 CFR 888.3565
Regulation Name: Knee Joint Patellofemorotibial Metal/Polymer Porous-Coated Uncemented Prosthesis
Regulatory Class: Class II
Product Code: MBH, JWH
Dated: September 29, 2025
Received: September 29, 2025

Dear Declan Brazil:

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 (the 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 available 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.

U.S. Food & Drug Administration
10903 New Hampshire Avenue
Silver Spring, MD 20993
www.fda.gov

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K253239 - Declan Brazil
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Additional information about changes that may require a new premarket notification are provided in the FDA guidance documents entitled "Deciding When to Submit a 510(k) for a Change to an Existing Device" (https://www.fda.gov/media/99812/download) and "Deciding When to Submit a 510(k) for a Software Change to an Existing Device" (https://www.fda.gov/media/99785/download).

Your device is also subject to, among other requirements, the Quality System (QS) regulation (21 CFR Part 820), which includes, but is not limited to, 21 CFR 820.30, Design controls; 21 CFR 820.90, Nonconforming product; and 21 CFR 820.100, Corrective and preventive action. Please note that regardless of whether a change requires premarket review, the QS regulation requires device manufacturers to review and approve changes to device design and production (21 CFR 820.30 and 21 CFR 820.70) and document changes and approvals in the device master record (21 CFR 820.181).

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); medical device reporting (reporting of medical device-related adverse events) (21 CFR Part 803) for devices or postmarketing safety reporting (21 CFR Part 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reporting-combination-products); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR Part 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR Parts 1000-1050.

All medical devices, including Class I and unclassified devices and combination product device constituent parts are required to be in compliance with the final Unique Device Identification System rule ("UDI Rule"). The UDI Rule requires, among other things, that a device bear a unique device identifier (UDI) on its label and package (21 CFR 801.20(a)) unless an exception or alternative applies (21 CFR 801.20(b)) and that the dates on the device label be formatted in accordance with 21 CFR 801.18. The UDI Rule (21 CFR 830.300(a) and 830.320(b)) also requires that certain information be submitted to the Global Unique Device Identification Database (GUDID) (21 CFR Part 830 Subpart E). For additional information on these requirements, please see the UDI System webpage at https://www.fda.gov/medical-devices/device-advice-comprehensive-regulatory-assistance/unique-device-identification-system-udi-system.

Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 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-devices/medical-device-safety/medical-device-reporting-mdr-how-report-medical-device-problems.

For comprehensive regulatory information about medical devices and radiation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medical-devices/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-devices/device-advice-comprehensive-regulatory-

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K253239 - Declan Brazil
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assistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email ([e-mail]) or phone [phone] or 301-796-7100).

Sincerely,


Lixin Liu, 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 | | |
| --- | --- | --- |
| Please type in the marketing application/submission number, if it is known. This
textbox will be left blank for original applications/submissions. | K253239 | ? |
| Please provide the device trade name(s). | | ? |
| Active-V Total Knee System;
World Total Knee System | | |
| Please provide your Indications for Use below. | | ? |
| The patient should be skeletally mature to receive a knee replacement. Patients should have adequate
bone stock and size to support and accept the prosthesis.

The patient’s needs for knee replacement should be due to one or more of the following conditions:
• Non-inflammatory degenerative joint disease including osteoarthritis, traumatic arthritis or avascular
necrosis
• Inflammatory degenerative joint disease including rheumatoid arthritis
• Functional deformity such as varus, valgus or flexion deformities
• Revision procedures where other treatments or device have failed
• Fractures that are unmanageable using other techniques

Signature Orthopaedics’ World Knee/Active-V Knee replacement components may be intended for
cemented or cementless use. | | |
| Please select the types of uses (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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K253239
Page 1 of 4
SignatureOrtho

# 510(k) SUMMARY

**Manufacturer:** Signature Orthopaedics Pty Ltd
7 Sirius Road
Lane Cove, NSW 2066
Australia

**Device Trade Name:**
1. Active-V Total Knee System
2. World Total Knee System

**Common Name:**
1. Total Knee Replacement System
2. Total Knee Replacement System

**Contact:**
Dr. Declan Brazil
Managing Director of Signature Orthopaedics

**Prepared By:**
Signature Orthopaedics Pty Ltd
7 Sirius Road
Lane Cove, NSW 2066
Australia
Phone: [phone]
Fax: [phone]

**Date Prepared:** 22nd December 2025

**Classification:**
888.3565 - Knee joint patellofemorotibial metal/polymer porous-coated uncemented prosthesis
MBH
888.3560 - Knee joint patellofemorotibial polymer/metal/polymer semi-constrained cemented prosthesis
JWH

**Predicate Devices:**
Substantial equivalence to the following devices is claimed:

**Active-V Total Knee System**
**Primary Predicate**
- Signature Orthopaedics, World Total Knee System (K181530)

**Additional Predicates**
- Signature Orthopaedics, World Total Knee System (K223062)
- Signature Orthopaedics, Triverse Total Knee System (K222380)

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K253239 - Page 2 of 4

SignatureOrtho

## Reference Device
- Signature Orthopaedics, Rx Knee System (K243680)

## World Total Knee System - Line Extension

### Primary Predicate
- Signature Orthopaedics, World Total Knee System (K181530)

### Additional Predicates
- Signature Orthopaedics, World Total Knee System (K220737, K223062)

## Reference Device
- Signature Orthopaedics, Rx Knee System (K243680)

## Device Description:

### Active-V Total Knee System
The Active-V Total Knee is a modular total knee system consisting of a femoral component, a meniscal insert, a patella, tibial baseplate with a fin keel and an external tibial augment. The femoral and tibial components are intended for cemented and cementless use. The tibial insert bearing components are available in cruciate retaining (CR) and ultracongruent (UC) variants while the femoral components are available in posterior stabilizing (PS) and CR variants. All components are intended for single use only.

The femoral component is an anatomically accurate designed prosthesis manufactured from cast cobalt chrome (CoCrMo) alloy. The tibial component is a modular symmetrical tray design, manufactured from Ti6Al4V Alloy. Cementless femoral components with plasma sprayed commercially pure titanium and hydroxyapatite coating with the option of titanium nitride coating are included. Tibial components with the same coating specifications as the femoral components are available. The tibial external augment is manufactured from the same Ti6Al4V alloy. The meniscal insert is available in CR and Medialconstrained (MC) variant surfaces, and is manufactured from Vitamin-E stabilized UHMWPE (HXLPE). The patella is a spherical, 3-peg patella design manufactured from Vitamin-E stabilized UHMWPE. Components are available for cemented or cementless use.

### World Total Knee System - Line Extension
The World Knee line extension presented in this 510(k) is addition of the following components:
- Cementless femoral components with new coating specifications (plasma sprayed commercially pure titanium and hydroxyapatite coating with the option of titanium nitride coating)
- Tibial components with the modified coating specifications (same as the femoral components) and tibial tray to fin keel modular design
- Constrained condylar knee (CCK) variant of the all poly tibia component and meniscal insert, and medialconstrained (MC) variant of the meniscal insert
- Tibial external augment

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K253239 - Page 3 of 4

SignatureOrtho

The femoral component is an anatomically accurate designed prosthesis manufactured from cast cobalt chrome (CoCrMo) alloy. The tibial component is a modular symmetrical tray design, manufactured from Ti6Al4V Alloy. The tibial external augment is manufactured from the same Ti6Al4V alloy. The meniscal inserts and all poly tibia are manufactured from conventional Ultrahigh Molecular Weight Polyethylene (UHMWPE) and Vitamin E Stabilized and 100 kGy Crosslinked UHMWPE (Vit-E HXLPE). Components are available for cemented or cementless use.

## Indications for Use:

Both subject devices have the same indications for use.

The patient should be skeletally mature to receive a knee replacement. Patients should have adequate bone stock and size to support and accept the prosthesis.

The patient's needs for knee replacement should be due to one or more of the following conditions:

- Non-inflammatory degenerative joint disease including osteoarthritis, traumatic arthritis or avascular necrosis
- Inflammatory degenerative joint disease including rheumatoid arthritis
- Functional deformity such as varus, valgus or flexion deformities
- Revision procedures where other treatments or device have failed
- Fractures that are unmanageable using other techniques

Signature Orthopaedics' Active-V/World Total Knee components may be intended for cemented and cementless use.

## Comparison of Technological Characteristics:

The subject and predicate devices have nearly identical technological characteristics, and the minor differences do not raise any different issues of safety and effectiveness. Specifically, the following characteristics are similar between the subject and predicates:

- Indications for Use
- Materials of manufacture
- Fixation method
- Principle of operation
- Sizes
- Design

Differences with predicate devices exist with respect to available porous coatings, available constraint options, and tibial augment components.

## Performance Testing:

Both subject devices' pre-clinical testing was planned following the guidance provided by the following FDA Guidance "Knee Joint Patellofemorotibial and Femorotibial Metal/Polymer Porous-coated Uncemented Prostheses". For non-applicable/not required testing, appropriate justification could be provided. Two sets of additional engineering evaluation were conducted to verify that the performances of the subject devices are adequate for anticipated in-vivo use. The following engineering evaluations were carried out on the worst-case sizes of the subject devices:

- Finite Element Analysis (FEA) performed on Active-V Knee Tibial Baseplate

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SignatureOrtho
K253239 - Page 4 of 4

- Range of Motion (ROM) Analysis performed on CCK all poly tibia/meniscal insert and MC meniscal insert

The combination of engineering evaluation results and scientific justification provided demonstrate that the Signature Orthopaedics' Active-V and World Total Knee Systems are sufficient for their intended use and substantially equivalent to the legally marketed predicate device.

## Substantial Equivalence:

Both subject devices have the same intended use and same indications for use as the corresponding predicate devices. The subject devices use the same operating principle, incorporate the same basic design, and is manufactured using the same materials as the predicate devices.

Any differences do not raise different questions of safety and effectiveness as established with performance testing. The subject devices are at least as safe and effective as the legally marketed predicate device.

## Conclusion:

Based on similarities in device design, materials, sizes, intended use, indications for use, packaging, sterilization, labeling, and performance testing to the predicate devices, the Active-V Total Knee System and World Total Knee System should perform in a substantially equivalent manner when used as indicated.