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For Tibial baseplate, CMA, #0
This device is indicated in knee arthroplasty for reduction or relief of pain and/or improved knee function in sketetally mature patients with severe knee pain and disability due to rheumatoid arthritis, primary and secondary traumatic arthritis, polyarthritis, collagen disorders, avascular necrosis of the femoral condyle or pseudogout, posttraumatic loss of joint configuration, particularly when there is patellofemoral joint surfaction or prior patellectorny, moderate valgus, varus, or flexion contraction. This device may also be indicated in the salvage or previously failed surgical attempts or for knee in which satisfactory stability in flexion cannot be obtained at the time of surgery. This device system is designed for cemented use only.

For Tibial insert, #0
The device is indicated in knee arthroplasty for reduction or relief of pain and/or improved knee function in sketally mature patients with severe knee pain and disability due to rheumatoid arthritis, primary and secondary traumatic arthritis, polyarthritis, collagen disorders, avascular necrosis of the femoral condyle or pseudogout, posttraumatic loss of joint configuration, particularly when there is patellofemoral erosion, dysfunction or prior patellectomy, moderate valgus, varus, or flexion deformities. This device may also be indicated in the salvage of previously failed surgical attempts if the knee can be satisfactorily balanced and stabilized at the time of surgery. This device is a single use implant and intended for cemented use only.

The U2 Total Knee System consists of Femoral components, patella components, Tibial baseplate components and Tibial inserts components which are designed to be used together to achieve total replacement of the knee joint. This system includes Cruciate Retained (CR) type, Ultracongruent (UC) type, and Posterior Stabilized (PS) type.

The U2 Total Knee System, Tibial baseplate, CMA, #0 (Subject device) is a size extension of the cleared "UNITED" U2 Total Knee System, Tibial baseplate, CMA, #1 to #7 (K131864). The materials, indications, sterilization of this subject are identical to the cleared "UNITED" U2 Total Knee System, Tibial baseplate, CMA, #1 to #7 (K131864).

The U2 Total Knee System, Tibial insert, #0 (Subject device) is a size extension of the cleared "UNITED" U2 Total Knee System, Tibial insert, #1 to #7 (K051640, K103733, K131864, K132752, K150829 and K161705). The materials, indications, sterilization of this subject are identical to the cleared "UNITED" U2 Total Knee System, Tibial insert, #1 to #7 (K051640, K103733, K131864, K132752, K150829 and K161705). The Subject Tibial insert, CR, #0 and Tibial insert, PS, #0 have a more concave sagittal plane design while comparing to the marketed predicate devices

Surgical procedures with the use of the Subject device shall be performed with the support of orthopedic instrumentation, to facilitate their proper insertion and removal from the patient. All the surgical instruments have been cleared as part of the predicate devices.

This is a medical device clearance, not an AI/ML device. Therefore, the questions regarding AI/ML device evaluations (sample size, experts, adjudication, MRMC, standalone performance, ground truth establishment for training set, etc.) are not applicable.

The document describes the acceptance criteria and study for a Tibial baseplate and Tibial insert, which are components of a knee replacement system. This is a traditional medical device, not an AI/ML powered device. Therefore, the concepts related to AI/ML device performance such as ground truth, expert adjudication, train/test sets, effect size of AI assistance, etc., are not relevant to this document.

However, I can extract the information provided regarding the device's performance analysis and acceptance criteria, based on the non-clinical tests conducted.

Here's the summary of the acceptance criteria and the study that proves the device meets them, based on the provided text:

1. A table of acceptance criteria and the reported device performance

The document does not explicitly list 'acceptance criteria' with numerical targets and then 'reported device performance' side-by-side in a table format. Instead, it states that "the following non-clinical tests were conducted to evaluate the safety and effectiveness of the subjected device, and the test results indicated that this device is safe and effective." This implies that the device met the internal acceptance criteria for each test.

2. Sample sized used for the test set and the data provenance (e.g. country of origin of the data, retrospective or prospective)

The document does not specify the sample sizes (number of devices tested) for the non-clinical tests. It also does not provide information about data provenance as these are laboratory-based mechanical tests, not clinical data sets.

3. Number of experts used to establish the ground truth for the test set and the qualifications of those experts (e.g. radiologist with 10 years of experience)

Not applicable. This is a mechanical device, not an AI/ML device requiring expert ground truth for image interpretation or diagnosis.

4. Adjudication method (e.g. 2+1, 3+1, none) for the test set

Not applicable. This is a mechanical device. Adjudication methods are relevant for subjective interpretations, typically in clinical studies or AI/ML ground truth establishment.

5. If a multi reader multi case (MRMC) comparative effectiveness study was done, If so, what was the effect size of how much human readers improve with AI vs without AI assistance

Not applicable. This is a mechanical device, not an AI/ML device.

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

Not applicable. This is a mechanical device, not an AI/ML device.

7. The type of ground truth used (expert consensus, pathology, outcomes data, etc.)

Not applicable. For mechanical devices, "ground truth" is typically defined by engineering specifications, material properties, and mechanical test standards (e.g., ISO or ASTM standards) that define acceptable performance limits. The document states that the "non-clinical tests were conducted to evaluate the safety and effectiveness," implying adherence to established engineering and material science principles, but specific ground truth definition is not explicitly detailed in this summary.

8. The sample size for the training set

Not applicable. This is a mechanical device, not an AI/ML device that requires a training set.

9. How the ground truth for the training set was established

Not applicable. This is a mechanical device, not an AI/ML device.

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The U2 Total Knee system is indicated in knee arthroplasty for reduction or relief of pain and/or improved knee function in skeletally mature patients with severe knee pain and disability due to rheumatoid arthritis, osteoarthitis, primary and secondary traumatic arthritis, polyarthritis, collagen disorders, avascular necrosis of the femoral condyle or pseudogout, posttraumatic loss of joint configuration, particularly when there is patellofemoral erosion, dysfunction or prior patellectomy, moderate valgus, varus, or flexion deformities. This device may also be indicated in the salvage of previously failed surgical attempts if the knee cannot be satisfactorily balanced and stabilized at the time of surgery.

For cemented femoral components, patellar components, tibial baseplate components and tibial inserts components: This device is a single use implant and intended for cemented use only.

For porous coated femoral component: This device is a single use implant and intended for cementless use only.

The U2 Total Knee System include femoral components, patellar components, tibial baseplate components and tibial inserts components which are designed to be used together to achieve total replacement of the knee joint. This system includes Cruciate Retained (CR) type, Posterior Stabilized (PS) type and Ultracongruent (UC) type. The subject device, U2 Total Knee System, XPE Tibial Insert, Posterior Stabilized PLUS (PS PLUS), belongs to U2 Total Knee System PS type.

U2 Total Knee System, XPE Tibial Insert, PS PLUS (Subject device) is a constrained design insert mechanically locked with metallic tibial baseplate. It is manufactured from Gamma irradiated UHMWPE which conform to ASTM F2565-13, while the UHMWPE raw material is in accordance with ASTM F648-14 and ISO 5834-1:2005.

The Subject device is used with the Posterior Stabilized (PS) type Femoral Component. In comparison to the marketed predicate devices, the Subject device has slightly modified width and height of the post, the height of the anterior lip. The Subject device provides constraint in varus/valgus and internal/external rotation to enhance joint stability and resist paradoxical anterior femoral slide.

Except for the differences of the post and anterior lip, the size distribution the Subject device is identical to the previously cleared Tibial Inserts of U2 Total Knee System predicates. The Subject device is available in eight proportional sizes (#0~ #7) and ten thicknesses (thicknesses of poly insert + tibial baseplate: 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm and 18mm). The minimum thickness of poly insert of Subject device is 6 mm on the bearing surface, identical to the primary predicate.

Surgical procedures with the use of the Subject device shall be performed with the support of orthopedic instrumentation, to facilitate their proper insertion and removal from the patient. The surgical instruments have been previously cleared as part of the predicate devices.

This document describes the FDA's decision regarding the substantial equivalence of the "U2 Total Knee System, XPE Tibial Insert, PS PLUS" to a predicate device. It does not contain information about the acceptance criteria or study results in the context of an AI/ML medical device.

Therefore, I cannot provide the requested information about acceptance criteria, reported device performance, sample sizes, ground truth, expert qualifications, adjudication methods, or MRMC studies, as these details are not present in the provided text.

The document is purely a regulatory clearance notice for a knee implant, focusing on its manufacturing, materials, and intended use as compared to existing, legally marketed predicate devices.

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