Search Results

• Rheumatoid arthritis;
• Post-traumatic arthritis, osteoarthritis, or degenerative arthritis;
• Posterior stabilized and constrained knee systems are also indicated for the treatment of unicompartmental replacement or total knee replacement;
• Posterior stabilized knee systems are designed for use in patients in primary and revision surgery, where the anterior and posterior cruciate ligaments are incompetent and the collateral ligaments remain intact.
• Constrained knee systems are designed for use in patients in primary and revision surgery, where the posterior cruciate ligament and one or both of the collateral ligaments (i.e. medial collateral and/or lateral collateral ligament) are incompetent.

The subject insert is a line addition to the LEGION Inserts with JOURNEY Lock (K200407) and has undergone design modifications to provide a new articulating surface that incorporates a flatter lateral plateau and extended medial geometry to match the asymmetry of the tibial baseplate, while maintaining the JOURNEY locking mechanism. The subject LEGION Medial Stabilized Inserts with JOURNEY Lock have a size range of 1-2, 3-4, 5-6, and 7-8mm with thicknesses of 9, 10, 11, 12, 13, 15, 18mm, and come in both left (LT) and right (RT) configurations. The LEGION Medial Stabilized XLPE Inserts with JOURNEY Lock are provided sterile via Ethylene Oxide sterilization and are intended for single use only. The subject inserts are intended to be used with compatible knee systems for total knee arthroplasty in skeletally mature patients with or without bone cement.

I am sorry, but based on the provided FDA 510(k) clearance letter for the LEGION Total Knee System, the document does not contain the specific information required to describe the acceptance criteria and the study that proves the device meets those criteria, especially in the context of an AI/human-in-the-loop performance study.

Here's why the requested information cannot be found in the provided text:

• Device Type: The cleared device, the "LEGION Total Knee System," is a physical medical device (a knee joint prosthesis), not an AI/software device. The 510(k) is for a hardware modification (a new articulating surface for an insert).
• Study Type: The document states, "No clinical testing was performed to support safety and effectiveness of the subject device." The testing mentioned is "bench testing" (Tibiofemoral Constraint Testing and Tibiofemoral Contact Area Testing) which applies to the physical properties of the knee implant.
• AI/Human-in-the-loop: There is no mention of AI, human readers, ground truth establishment by experts, or MRMC studies, as the device is not an AI diagnostic or assistance tool.

Therefore, I cannot provide a table of acceptance criteria and reported device performance related to AI, nor can I answer questions about sample sizes for AI test sets, expert numbers, adjudication methods, MRMC studies, standalone AI performance, or training set details, as these concepts are not applicable to the cleared device as described.

The document focuses on demonstrating substantial equivalence of a new knee implant component to existing, legally marketed predicate devices through material and mechanical performance testing.

Ask a specific question about this device

1. Rheumatoid arthritis.
2. Post-traumatic arthritis, osteoarthritis, or degenerative arthritis.
3. Failed osteotomies, unicompartmental replacement, or total knee replacement.
4. Posterior stabilized knee systems are designed for use in patients in primary and revision surgery, where the anterior and posterior cruciate ligaments are incompetent and the collateral ligaments remain intact.
   The ANTHEM PS Total Knee System is indicated for use only with cement and is a single use device.

Unicompartmental knee implants are indicated for restoring either compartment of a knee that has been affected by the following:

1. Noninflammatory degenerative joint disease including osteoarthritis, traumatic arthritis, or avascular necrosis;

2. Correction of functional deformity;

3. Revision procedures where other treatments or devices have failed: and

4. Treatment of fractures that are unmanageable using other techniques
   Unicompartmental knee implants are single use only and are intended for implantation only with bone cement. HA coated unicompartmental knee implants are available outside the US for use without bone cement.

5. Rheumatoid arthritis.

6. Post-traumatic arthritis, osteoarthritis, or degenerative arthritis.

7. Failed osteotomies, unicompartmental replacement, or total knee replacement.

8. Posterior stabilized knee systems are designed for use in patients in primary and revision surgery, where the anterior and posterior cruciate ligaments are incompetent and the collateral ligaments remain intact.
   Smith & Nephew, Inc. Journey II BCS Knee components are indicated for use only with cement and are single use devices.

9. Rheumatoid arthritis.

10. Post-traumatic arthritis, osteoarthritis, or degenerative arthritis.

11. Failed osteotomies, unicompartmental replacement, or total knee replacement.

12. Posterior stabilized knee systems are designed for use in patients in primary and revision surgery, where the anterior and posterior cruciate ligaments are incompetent and the collateral ligaments remain intact.
    The Journey II Total Knee system components are indicated for use only with cement and are single use devices.

Unicompartmental knee implants are indicated for restoring either compartment of a knee that has been affected by the following:

1. Noninflammatory degenerative joint disease including osteoarthritis, or avascular necrosis;
2. Correction of functional deformity;
3. Revision procedures where other treatments or devices have failed; and
4. Treatment of fractures that are unmanageable using other techniques
   Unicompartmental knee implants are single use only and are intended for implantation only with bone cement. HA coated unicompartmental knee implants are available outside the US for use without bone cement.

Unicompartmental knee implants are indicated for restoring either compartment of a knee that has been affected by the following:
· Non-inflammatory degenerative joint disease including osteoarthritis, traumatic arthritis, or avascular necrosis:
· Correction of functional deformity;
· Revision procedures where other treatments or devices have failed; and
· Treatment of fractures that are unmanageable using other techniques.
Unicompartmental knee implants are single use only and are intended for implantation only with bone cement.

Total knee components are indicated for rheumatic arthritis, osteoarthritis, osteoarthritis, or degenerative arthritis; failed osteotomies, unicompartmental replacement, or total knee replacement.
The Journey II Total Knee system components are indicated for use only with cement and are single use devices.

1. Degenerative arthritis in the distal femur and patella;
2. A history of patellar dislocation or patellar fracture; and
3. Failed previous surgery (arthroplasty, tibial tubercule elevation, lateral release) where pain, deformity or dysfunction persists.
   The Smith & Nephew Patello-Femoral Implants are intended for implantation with bone cement.

Unicompartmental knee implants are indicated for restoring either compartment of a knee that has been affected by the following:

1. Noninflammatory degenerative joint disease including osteoarthritis, or avascular necrosis;

2. Correction of functional deformity;

3. Revision procedures where other treatments or devices have failed; and

4. Treatment of fractures that are unmanageable using other techniques
   Unicompartmental knee implants are single use only and are intended for implantation only with bone cement. HA coated unicompartmental knee implants are available outside the US for use without bone cement.

5. Rheumatoid arthritis.

6. Post-traumatic arthritis, osteoarthritis, or degenerative arthritis.

7. Failed osteotomies, unicompartmental replacement, or total knee replacement.

8. Posterior stabilized knee systems are designed for use in patients in primary and revision surgery, where the anterior and posterior cruciate ligaments are incompetent and the collateral ligaments remain intact.

9. Constrained knee systems are designed for use in patients in primary and revision surgery, where the posterior cruciate ligament and one or both of the collateral ligaments (i.e. medial collateral collateral ligament) are incompetent.

10. Hinge knee systems are designed for use in patients in primary and revision surgery, where the posterior cruciate ligament and one or both of the collateral ligaments (i.e. medial collateral ligament) are absent or incompetent.
    The Legion Hinge Knee System is for Cemented Use Only.

11. Rheumatoid arthritis.

12. Post-traumatic arthritis, osteoarthritis, or degenerative arthritis.

13. Failed osteotomies, unicompartmental replacement, or total knee replacement.

14. Posterior stabilized knee systems are designed for use in patients in primary and revision surgery, where the anterior and posterior cruciate ligaments are incompetent and the collateral ligaments remain intact.

15. Constrained knee systems are designed for use in patients in primary and revision surgery, where the posterior cruciate ligament and one or both of the collateral ligaments (i.e. medial collateral collateral ligament) are incompetent.

16. Hinge knee systems are designed for use in patients in primary and revision surgery, where the posterior cruciate ligament and one or both of the collateral ligaments (i.e. medial collateral ligament) are absent or incompetent.
    The LEGION Knee System - Finned Tibial Wedges are for single use only and are intended for implantation with bone cement.

These devices are indicated for patients with:

1. Painful and/or disabling knee joints due to osteoarthritis or traumatic arthritis.
2. Previous tibial condyle or plateu fractures with loss of anatomy or function.
3. Varus or Valgus deformities.
4. Revision of previous arthroplasty procedures.
   The devices are indicated for cemented use only.
   The Zimmer Unicompartmental Knee System is designed for use when load bearing ROM is expected to be less than or equal to 155 degrees.

The Engage™ Partial Knee System is intended for medial unicompartmental knee arthroplasty to treat one or more of the following conditions:

• Moderately disabling joint disease of the knee resulting from painful osteo- or post traumatic arthritis.
• Revision of previous unsuccessful surgical procedures, including prior unicompartmental knee arthroplasty
• As an alternative to tibial osteotomy in patients with Unicompartmental osteoarthritis.
  The femoral component and tibial tray are intented fixation. The porous surfaces of both the femoral and tibial tray components provide biological fixation when used in a cementless application. When the tibial tray is implanted without the use of bone cement, the tibial anchor should be used. When the tibial tray is implanted with bone cement, the tibial anchor should not be used.

Total Knee components are indicated for:

1. Rheumatoid arthritis
2. Post- traumatic arthritis, osteoarthritis, or degenerative arthritis
3. Failed osteotomies, unicompartmental replacement, or total knee replacement
4. The posterior stabilized knee system is designed for use in primary and revision surgery, where the anterior and posterior cruciate ligaments are incompetent and the collateral ligaments remain intact.
   LEGION Porous CR Narrow Femoral Components are indicated for use without bone cement and are single use devices.
   The Porous Patella and the Porous Tibia Baseplate are indicated for use with or without bone cement, and are single use devices.

The purpose of this Traditional 510(k) is to add MR safety information to the labeling (instructions for use, product labeling and patient implant card) of the subject Smith & Nephew Knee Systems. The technological characteristics, function of the devices, packaging and sterilization remain unchanged. As these products have been in distribution for several years, some parts have undergone changes in the technological characteristics that were assessed in compliance with the FDA's guidanceon "Deciding When to Submit a 510(k) for a Change to an Existing Device" or the FDA predecessor guidance on how to review changes to an existing device. These are not cumulative changes for all Smith & Nephew Knee Systems, but are rather specific changes that only affect certain parts. In the context of this submission, no modifications have been made to the device design, materials, sterilization, or the manufacturing process of the previously cleared devices due to the addition of MR Labeling for this 510(k).

The provided text describes a 510(k) premarket notification for various Smith & Nephew knee systems. The purpose of this submission is not to introduce a new device or significantly change an existing one that would require a new performance study to demonstrate clinical effectiveness or safety based on patient outcomes. Instead, the core of this submission is to add MR safety information to the labeling of existing, already cleared devices.

Therefore, the typical "acceptance criteria" and "study that proves the device meets the acceptance criteria" in the context of diagnostic or AI-driven devices (which you are asking about) are not applicable to this 510(k) submission.

The "performance data" section in the document, despite its heading, refers specifically to Magnetic Resonance Imaging (MRI) compatibility testing, not clinical performance of the knee implants themselves. This testing aims to demonstrate that the presence of the knee implants does not pose an undue risk or create excessive artifacts during MRI scans.

Here's why the questions you asked cannot be fully answered or are not relevant to this specific regulatory submission:

• No new device performance for clinical outcomes: This submission isn't about proving a device (like an AI algorithm) is effective at diagnosing or treating a condition. It's about ensuring an existing physical implant is safe in an MRI environment.
• No diagnostic or AI algorithm: The "device" in question here is a knee implant, not a software algorithm that generates clinical insights or diagnoses. Therefore, terms like "multi reader multi case (MRMC) comparative effectiveness study," "standalone (algorithm only) performance," "ground truth," or "training set" are not applicable.

However, I can extract the relevant information regarding the MR safety testing which serves as the "study" for this particular 510(k) submission:

Acceptance Criteria and Study for MR Safety Labeling (as described in the document):

Since this 510(k) is specifically for adding MR safety information to the labeling of already cleared devices, the "acceptance criteria" and "study" revolve around demonstrating the device's compatibility with MRI environments, not its clinical performance as a knee implant.

1. Table of Acceptance Criteria and Reported Device Performance (for MR Safety)

Summary of Device Performance: The document states that "MR Safety testing/assessments support the appropriate MR parameters and symbols found in the subject device labeling." This implies that the devices met the requirements of the referenced ASTM and IEC standards for MR compatibility, allowing defined MR conditions (e.g., specific field strengths, gradients, RF levels) for imaging patients with these implants.

2. Sample Size Used for the Test Set and Data Provenance:

• Sample Size: The document does not specify the sample size for the MR safety testing. These tests are typically conducted on representative samples of the implant devices themselves, not on human patients.
• Data Provenance: The testing references industry standards (ASTM, IEC, ISO/TS), indicating that the tests were performed in a controlled laboratory environment in accordance with these established protocols. The country of origin of the data is not specified but is presumed to be where Smith & Nephew conducted their R&D and testing. Since it's device testing, not patient data, the retrospective/prospective distinction is not applicable.

3. Number of Experts Used to Establish Ground Truth and Qualifications:

• Not Applicable: For MR safety testing of physical implants, "ground truth" as established by human experts (like radiologists interpreting images) is not the primary method. The "ground truth" for MR safety is determined by the physical properties of the materials and the design of the device, measured against established engineering and safety standards. The experts involved would be engineers and physicists specializing in MRI safety and material science.

4. Adjudication Method for the Test Set:

• Not Applicable: Adjudication methods (like 2+1 or 3+1 for clinical interpretations) are not relevant here. The results of MR safety testing are quantitative measurements (e.g., temperature rise, displacement force, torque, artifact size) subject to direct measurement and comparison against defined thresholds in the standards.

5. If a Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study was done:

• No: This is not applicable. MRMC studies are used to assess the impact of a diagnostic tool (like an AI algorithm) on human reader performance. This submission is about the physical safety of an implant in an MRI scanner.

6. If a Standalone (i.e., algorithm only without human-in-the-loop performance) was done:

• No: This is not applicable as there is no algorithm being tested in this submission.

7. The Type of Ground Truth Used:

• Technical Standards and Physical Measurements: The "ground truth" for MR safety is established by international and national technical standards (ASTM, IEC, ISO/TS) that define acceptable limits for magnetic force, torque, heating, and image artifact. The studies involve physical measurements of these parameters using specialized testing equipment.

8. The Sample Size for the Training Set:

• Not Applicable: There is no "training set" in the context of MR safety testing of physical implants, as this is not an AI/machine learning submission.

9. How the Ground Truth for the Training Set Was Established:

• Not Applicable: As there is no training set, this question is not relevant.

In summary, this 510(k) submission is a prime example of a regulatory clearance based on engineering and performance testing against recognized standards for physical device properties (MR compatibility), rather than clinical efficacy studies or AI performance metrics.

Ask a specific question about this device