This device is indicated in knee arthroplasty in skeletally mature patients with severe knee pain and disability due to rheumatoid arthritis, osteoarthritis, 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 contraction. This device is intended for use in patients who require augmentation and/or stem extensions due to inadequate bone stock and/or require increased stabilization for tibiofemoral joint due to soft tissue imbalance. The femoral and tibial augments are to be attached to their respective components with a fixation screw or screws. Note: In the US, this device is for cemented use only.

Device Description

"UNITED" Augment and Screw - PSA Type, including femoral augments - distal only and tibial augments, is an extension of cleared "UNITED" U2 Total Knee System -PSA Type (K082424). The raw materials, safety and effectiveness of this subject device are identical to the "UNITED" U2 Total Knee System - PSA Type (K082424), except for increasing their thickness and modifying the shape to mimic anatomy. Femoral augment - distal only made of Co-Cr-Mo alloy (ASTM F75 or ASTM F1537) are available in 12 mm and 16 mm thickness and can be positioned on either side of femoral component. This component is only available distally. Tibial augments are made of Ti-6Al-4V alloy (ASTM F136/ISO 5832-3) and with 15 mm thickness. The periphery of the distal end of tibial augments is larger than that of the proximal end. It is left/right specific. The femoral augments and tibial augments are sized to match the femoral components and tibial base plates, respectively. There are 6 sizes (sizes #1 through 6) to match the corresponding augmentable femoral components - PSA type and tibial baseplates - PSA type (K082424). The augments are affixed to the tibial and femoral components with screw fixation and that the implant construct as a whole is to be fixed with cement. This device should not be used with another manufacturer's total knee systems since dimensional compatibility cannot be assured. It also should not be used with U2 Total Knee System - PS Type and CR Type. For total knee replacement, "UNITED" patella components (K021657, K051640, K082469, and K103733) are intended to be used with U2 Total Knee System - PSA Type (K082424) and the subject device.

AI/ML Overview

The provided text is a 510(k) summary for the "Augment and Screw, PSA Type" knee system. This document focuses on demonstrating substantial equivalence to predicate devices, primarily through engineering and manufacturing comparisons rather than clinical performance data typical of AI/ML devices. Therefore, many of the requested fields are not applicable to this type of submission.

Here's an analysis of the provided information relative to your request:

1. Table of Acceptance Criteria and Reported Device Performance

Acceptance Criteria	Reported Device Performance
Locking Strength between femoral component and femoral augment	Demonstrated substantial equivalence to predicate device.
Locking Strength between tibial baseplate and tibial augment	Demonstrated substantial equivalence to predicate device.

Explanation: The document states, "The locking strength evaluation between femoral component and femoral augment, as well as tibial baseplate and tibial augment completed as part of the design assurance process, demonstrated that this device is substantially equivalent to the predicate device." Acceptance criteria for "locking strength" are not explicitly quantified (e.g., minimum Newtons of force, cycles endured), but the conclusion is that the new device performs equivalently to established predicate devices.

2. Sample size used for the test set and the data provenance:

Sample Size: Not explicitly stated. The performance data section refers to "locking strength evaluation," implying mechanical testing rather than a clinical dataset. The number of samples tested for this evaluation is not provided.
Data Provenance: Not applicable in the traditional sense of clinical data. This is a mechanical engineering evaluation of a physical device.

3. Number of experts used to establish the ground truth for the test set and the qualifications of those experts:

Not Applicable. Ground truth, in the context of AI/ML, refers to human annotations or confirmed diagnoses used for model training and validation. For this mechanical device, "ground truth" would be the measured physical properties during testing, likely assessed against engineering specifications by qualified engineers or technicians, though their qualifications are not detailed.

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

Not Applicable. Adjudication methods are typically used to resolve discrepancies among expert opinions in clinical ground truth establishment. This document describes mechanical testing.

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:

No. This is a hardware device (knee augment and screw) and not an AI/ML-driven device that assists human readers. Therefore, an MRMC study is not relevant to this submission.

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

No. This is a hardware device. "Standalone performance" in the context of AI/ML refers to the algorithm's performance without human intervention. This concept does not apply here.

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

Mechanical Test Results/Engineering Specifications. The "ground truth" for this device's performance would be the direct measurements from mechanical tests (e.g., force required for failure, displacement under load) compared against established engineering standards or the performance of predicate devices.

8. The sample size for the training set:

Not Applicable. There is no "training set" in the context of an AI/ML model for this hardware device. The device's design is based on engineering principles and iterative design assurance processes, not machine learning.

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

Not Applicable. See point 8.

Summary

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K122183

Augment and Screw, PSA Type

. 510(k) Summary

510(k) Summary of Safety and Effectiveness

Submitted by:	United Orthopedic Corporation
Address:	No 57, Park Ave 2, Science Park, Hsinchu 300, Taiwan
Phone Number:	+886-3-5773351 ext. 2212
Fax Number:	+886-3-5777156
Date of Summary:	July 20, 2012
Contact Person	Fang-Yuan HoRegulation and Document Management
Proprietary Name:	Augment and Screw, PSA Type
Common Name:	Knee System Augments
Device Classification	Knee joint patellofemorotibial polymer/metal/polymer
Name and Reference:	semi-constrained cemented prosthesis per 21CFR 888.3560This falls under the Orthopedics panel.
Device Class	Class II
Panel Code	Orthopaedics Device
Device Product Code:	JWH
Predicate Device:	1. "UNITED" U2 Total Knee System - PSA Type (K082424)2. "Zimmer" NexGen Complete Knee Solution Legacy CCK Type (K960279)3. "BIOMET" Vanguard 360 Revision Knee System

(K093293)

Device Description:

Page: Summary-1/3

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K122183

Augment and Screw, PSA Type

510(k) Summary

are identical to the "UNITED" U2 Total Knee System - PSA Type (K082424), except for increasing their thickness and modifying the shape to mimic anatomy.

Femoral augment - distal only made of Co-Cr-Mo alloy (ASTM F75 or ASTM F1537) are available in 12 mm and 16 mm thickness and can be positioned on either side of femoral component. This component is only available distally. Tibial augments are made of Ti-6Al-4V alloy (ASTM F136/ISO 5832-3) and with 15 mm thickness. The periphery of the distal end of tibial augments is larger than that of the proximal end. It is left/right specific. The femoral augments and tibial augments are sized to match the femoral components and tibial base plates, respectively. There are 6 sizes (sizes #1 through 6) to match the corresponding augmentable femoral components - PSA type and tibial baseplates - PSA type (K082424). The augments are affixed to the tibial and femoral components with screw fixation and that the implant construct as a whole is to be fixed with cement. This device should not be used with another manufacturer's total knee systems since dimensional compatibility cannot be assured. It also should not be used with U2 Total Knee System - PS Type and CR Type. For total knee replacement, "UNITED" patella components (K021657, K051640, K082469, and K103733) are intended to be used with U2 Total Knee System - PSA Type (K082424) and the subject device.

Indications

UOC-FDA-023

Page: Summary-2/3

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ತಿ Augment and Screw, PSA Type

510(k) Summary

valgus, varus, or flexion contraction. This device is intended for use in patients who require augmentation and/or stem extensions due to inadequate bone stock and/or require increased stabilization for tibiofemoral joint due to soft tissue imbalance. The femoral and tibial augments are to be attached to their respective components with a fixation screw or screws.

Note: In the US, this device is for cemented use only.

Basis for Substantial Equivalence:

The intended uses, materials, locking mechanism design and sterilization method of femoral augments - distal only are similar to the femoral augments of U2 Total Knee System - PSA Type (K082424) and "Zimmer" NexGen Complete Knee Solution Legacy CCK Type (K960279). The differences between these three devices are 1) thickness, 2) geometry, and 3) the femoral screw length and its threaded length.

The intended uses, substrate materials, locking mechanism design and sterilization method of tibial augments are similar to the tibial augments of U2 Total Knee System -PSA Type (K082424) and "BIOMET" Vanguard 360 Revision Knee System (K093293). The differences between these three devices are 1) thickness, 2) geometry, and 3) edge taper.

Performance Data:

The locking strength evaluation between femoral component and femoral augment, as well as tibial baseplate and tibial augment completed as part of the design assurance process, demonstrated that this device is substantially equivalent to the predicate device.

Page: Summary-3/3

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Letter dated: February 5, 2013

Food and Drug Administration 10903 New Hampshire Avenue Document Control Center - WO66-G609 Silver Spring, MD 20993-0002

United Orthopedic Corporation % Ms. Fang-Yuan Ho Regulatory Affairs, Manager No. 57, Park Avenue 2, Science Park Hsinchu, 300 Taiwan

Re: K122183

Trade/Device Name: Augment and Screw, PSA Type Regulation Number: 21 CFR 888.3560 Regulation Name: Knee joint patellofemorotibial polymer/metal/polymer semi-constrained cemented prosthesis Regulatory Class: Class II Product Code: JWH Dated: December 20, 2012 Received: December 26, 2012

Dear Ms. Ho:

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. 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 requirements, including, but not limited to: registration and listing (21

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Page 2 - Ms. Fang-Yuan Ho

CFR Part 807); labeling (21 CFR Part 801); medical device reporting (reporting of medical device-related adverse events) (21 CFR 803); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.

If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please go to http://www.fda.gov/AboutFDA/CentersOffices/CDRH/CDRHOffices/ucm115809.htm for the Center for Devices and Radiological Health's (CDRH's) Office of Compliance. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to

http://www.fda.gov/MedicalDevices/Safety/ReportaProblem/default.htm for the CDRH's Office of Surveillance and Biometrics/Division of Postmarket Surveillance.

You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address http://www.fda.gov/MedicalDevices/Resourcesfor You/Industry/default.htm.

Sincerely yours,

Mark N. Melkerson

Mark N. Melkerson Director Division of Orthopedic Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

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Indication for Use

510 (k) Number (if known): ___________________________________________________________________________________________________________________________________________________

Device Name: Augment and Screw, PSA Type

Indications for Use:

Note: In the US, this device is for cemented use only.

Prescription Use AND/OR Over-The-Counter Use (Part 21 CFR 801 Subpart D) (21 CFR 801 Subpart C)

(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of CDRH, Office of Device Evaluation (ODE)

Anton E. Dmitriev, PhD	2013.02.05 10:03:47
Division of Orthopedic Devices	-05'00'

Page 1 of 1

Regulation Number and Section

§ 888.3560 Knee joint patellofemorotibial polymer/metal/polymer semi-constrained cemented prosthesis.

(a)
Identification. A knee joint patellofemorotibial polymer/metal/polymer semi-constrained cemented 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 includes prostheses that have a femoral component made of alloys, such as cobalt-chromium-molybdenum, and a tibial component or components and a retropatellar resurfacing component made of ultra-high molecular weight polyethylene. This generic type of device is limited to those prostheses intended for use with bone cement (§ 888.3027).(b)
Classification. Class II.