The Smith & Nephew Patello-Femoral Implant is indicated for replacement of the femoral side of the patello-femoral joint. It is intended to be used in patellofemoral arthroplasty in patients with degenerative arthritis in the distal femur and patients with a history of patellar dislocation or patellar fracture, and patients with failed previous surgery (arthroplasty, tibial tubercle elevation, and lateral release) where pain, deformity or dysfunction persists. The components are for single use only and are intended for implantation with bone cement.

Device Description

The Smith & Nephew Patello-Femoral Components are intended to replace the patellofemoral articulating surface of the femur. The components will be manufactured from Oxinium and will be initially manufactured in sizes x-small, medium, and large. Each size will be provided in both left and right configurations. The trochlear groove geometry is the same geometry as found with the Smith & Nephew Genesis II Total Knee Femoral Component subject of K951987.

AI/ML Overview

This is a 510(k) premarket notification for a medical device (knee implant), which relies on demonstrating substantial equivalence to a predicate device rather than conducting new clinical studies to prove effectiveness or establish acceptance criteria based on performance metrics. Therefore, the provided text does not contain information on acceptance criteria, a study proving the device meets those criteria, or most of the other requested details regarding clinical performance evaluation.

Here's a breakdown of what can be extracted and why other points cannot be addressed:

Device Information and Equivalence

Device Name: Smith & Nephew Patello-Femoral Knee Implant
Intended Use: Replacement of the femoral side of the patello-femoral joint in patients with:
- Degenerative arthritis in the distal femur and patella.
- A history of patellar dislocation or patellar fracture.
- Failed previous surgery (arthroplasty, tibial tubercle elevation, lateral release) where pain, deformity, or dysfunction persists.
Predicate Device: Howmedica Osteonics Avon™ Patello-Femoral Joint Prosthesis (K010100 and K041160). The Smith & Nephew Patella Type 1 (preamendment) is also mentioned as similar. The submission asserts "substantial equivalence" based on similar design features, overall indications, and materials to these predicate devices.

What cannot be extracted from the provided text:

The submission is a 510(k) for substantial equivalence, not a clinical trial report. As such, the concept of "acceptance criteria" for performance metrics like sensitivity, specificity, accuracy, or reader improvement is not applicable in this context. The document focuses on demonstrating that the new device is as safe and effective as a legally marketed predicate device, primarily through comparison of design, materials, and intended use, rather than through new clinical performance studies that establish quantitative endpoints.

Therefore, the following points cannot be answered from the provided text because they relate to the performance evaluation of the device through studies with specific acceptance criteria and ground truth, which are not part of a 510(k) summary focused on substantial equivalence for this type of device:

A table of acceptance criteria and the reported device performance: Not applicable for a 510(k) submission of this nature.
Sample size used for the test set and the data provenance: No new clinical test set is described.
Number of experts used to establish the ground truth for the test set and the qualifications of those experts: Ground truth establishment is not described for new clinical data.
Adjudication method for the test set: Not applicable.
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 device is a physical implant, not an AI-based diagnostic tool.
If a standalone (i.e. algorithm only without human-in-the-loop performance) was done: Not applicable.
The type of ground truth used: Ground truth for performance is not established and reported in this document.
The sample size for the training set: Not applicable. There is no mention of a "training set" as this is not an AI/algorithm-based device and no new clinical data is presented for that purpose.
How the ground truth for the training set was established: Not applicable.

Summary

{0}------------------------------------------------

K051086 (pg 1 of 1)

MAY 3 1 2005 510(K) Summary SMITH & NEPHEW PATELLO-FEMORAL KNEE IMPLANT

SUBMITTER'S NAME: SUBMITTER'S ADDRESS: SUBMITTER'S TELEPHONE NUMBER: CONTACT PERSON: DATE SUMMARY PREPARED: TRADE OR PROPRIETARY DEVICE NAME: COMMON OR USUAL NAME: CLASSIFICATION NAME:

DEVICE CLASS: PANEL CODE:

Smith & Nephew, Inc., Orthopaedic Division 1450 Brooks Road, Memphis, TN 38116 901-399-6707 Gino J. Rouss April 26, 2005 Smith & Nephew Patello-Femoral Implant Patello-Femoral Replacement Knee joint patellofemoral polymer/metal semiconstrained cemented prosthesis Class II Orthopedics/87 KRR

DEVICE INFORMATION:

A. INTENDED USE:

These indications are the same as found with the Howmedica Osteonics Avon" Patello-Femoral Joint Prosthesis cleared via K010100 and K041160.

B. DEVICE DESCRIPTION:

SUBSTANTIAL EQUIVALENCE INFORMATION: C.

The Smith & Nephew Patello-Femoral Components are similar to the following commercially available devices regarding design features, overall indications, and materials:

· Smith & Nephew (formerly Richards Medical) Patella Type 1 (preamendment)
· Howmedica Osteonics Corporation Avon" Patello-Femoral Joint Prosthesis (K010100 and K041160)

{1}------------------------------------------------

DEPARTMENT OF HEALTH & HUMAN SERVICES

Image /page/1/Picture/1 description: The image shows the logo for the U.S. Department of Health and Human Services. The logo consists of a circular seal with the text "DEPARTMENT OF HEALTH AND HUMAN SERVICES - USA" around the perimeter. Inside the circle is a stylized representation of three human figures, depicted as abstract shapes with flowing lines.

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

MAY 3 1 2005

Mr. Gino J. Rouss, M.S. Regulatory Affairs Specialist Smith & Nephew Incorporated Orthopaedic Division 1450 E. Brooks Road Memphis, Tennessee 38116

Re: -K051086

Trade/Device Name: Smith & Nephew Patello-Femoral Knee Implant Regulation Number: 21 CFR 888.3540 Regulation Name: Knee joint patellofemoral polymer/metal semi-constrained cemented prosthesis Regulatory Class: II Product Code: KRR Dated: April 26, 2005 Received: April 28, 2005

Dear Mr. Rouss:

We have reviewed your Section 510(k) premarket notification of intent to market the device we nave reviewed your bection of the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate 101 use stated in the enclosale) (c region) the enactment date of the Medical Device Amendments, or to connineres prior to May 20, 1978, in encordance with the provisions of the Federal Food, Drug, devices that have been rochise in assessoval of a premarket approval application (PMA). and Costinette Ace (110.) market the device, subject to the general controls provisions of the Act. The r ou may, dicrerore, maines of the Act include requirements for annual registration, listing of general one of the resuring practice, labeling, and prohibitions against misbranding and adulteration.

If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it If your device is clubsition (600 as controls. Existing major regulations affecting your device can may be subject to subject to submitted in the 21, Parts 800 to 898. In addition, FDA may be found in the Overnments concerning your device in the Federal Register.

Please be advised that FDA's issuance of a substantial equivalence determination does not mean Flease oe advised that I Dri 3 issuance or our device complies with other requirements of the Act that I DA has made a decerminations administered by other Federal agencies. You must or any it cacal statutes and regaraneers, including, but not limited to: registration and listing (21 Comply with an the Act 3 requirements, moreans, and manufacturing practice requirements as set CFN in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic form in the quality systems (Sections 531-542 of the Act); 21 CFR 1000-1050.

{2}------------------------------------------------

Page 2 - Mr. Gino J. Rouss, M.S.

This letter will allow you to begin marketing your device as described in your Section 510(k) This letter will and wyou to obgen inding of substantial equivalence of your device to a legally premaince notification - nesults in a classification for your device and thus, permits your device to proceed to the market.

If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please If you desire specific acrice for your 2009 276-0120. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). You may obtain other general information on your responsibilities under the Act from the Division of Small other general international and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its Internet address http://www.fda.gov/cdrh/industry/support/index.html.

Sincerely yours,

Miriam C. Provost, Ph.D.

Acting Director Division of General, Restorative and Neurological Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

{3}------------------------------------------------

K051086 Indications for Use

510(k) Number (if known):

Device Name: Smith & Nephew Patello-Femoral Knee Implant

Indications for Use:

The Smith & Nephew Patello-Femoral Implant is indicated for replacement of the femoral side of the Shillin & Nephen Patello remoral to be used in patellofemoral arthroplasty in patients with:

Degenerative arthritis in the distal femur and patella. 1.
A history of patellar dislocation or patellar fracture. 2.
Failed previous surgery (arthroplasty, tibial tubercle elevation, lateral release) where 3. pain, deformity or dysfunction persists.

The Smith & Nephew Patello-Femoral Implants are for single use only and are intended for implantation with bone cement.

Prescription Use(Part 21 CFR 801 Subpart D)	X AND/OR
-------------------------------------------------	----------

Over-The-Counter Use (21 CFR 807 Subpart C)

(Please do not write Below This Line – Continue on another Page if Needed)

Concurrence of CDRH, Office of Device Evaluation (ODE)

Hypt Church

Page 1 of ____________________________________________________________________________________________________________________________________________________________________

Division of General, Restorative, and Neurological Devices

510(k) Number Kos1086

Regulation Number and Section

§ 888.3540 Knee joint patellofemoral polymer/metal semi-constrained cemented prosthesis.

(a)
Identification. A knee joint patellofemoral polymer/metal semi-constrained cemented prosthesis is a two-part device intended to be implanted to replace part of a knee joint in the treatment of primary patellofemoral arthritis or chondromalacia. 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 a component made of alloys, such as cobalt-chromium-molybdenum or austenitic steel, for resurfacing the intercondylar groove (femoral sulcus) on the anterior aspect of the distal femur, and a patellar component made of ultra-high molecular weight polyethylene. This generic type of device is limited to those devices intended for use with bone cement (§ 888.3027). The patellar component is designed to be implanted only with its femoral component.(b)
Classification. Class II. The special controls for this device are:(1) FDA's:
(i) “Use of International Standard ISO 10993 ‘Biological Evaluation of Medical Devices—Part I: Evaluation and Testing,’ ”
(ii) “510(k) Sterility Review Guidance of 2/12/90 (K90-1),”
(iii) “Guidance Document for Testing Orthopedic Implants with Modified Metallic Surfaces Apposing Bone or Bone Cement,”
(iv) “Guidance Document for the Preparation of Premarket Notification (510(k)) Applications for Orthopedic Devices,” and
(v) “Guidance Document for Testing Non-articulating, ‘Mechanically Locked’ Modular Implant Components,” and
(2) International Organization for Standardization's (ISO):
(i) ISO 5832-3:1996 “Implants for Surgery—Metallic Materials—Part 3: Wrought Titanium 6-Aluminum 4-Vandium Alloy,”
(ii) ISO 5832-4:1996 “Implants for Surgery—Metallic Materials—Part 4: Cobalt-Chromium-Molybdenum Casting Alloy,”
(iii) ISO 5832-12:1996 “Implants for Surgery—Metallic Materials—Part 12: Wrought Cobalt-Chromium-Molybdenum Alloy,”
(iv) ISO 5833:1992 “Implants for Surgery—Acrylic Resin Cements,”
(v) ISO 5834-2:1998 “Implants for Surgery—Ultra-high Molecular Weight Polyethylene—Part 2: Moulded Forms,”
(vi) ISO 6018:1987 “Orthopaedic Implants—General Requirements for Marking, Packaging, and Labeling,”
(vii) ISO 7207-2:1998 “Implants for Surgery—Components for Partial and Total Knee Joint Prostheses—Part 2: Articulating Surfaces Made of Metal, Ceramic and Plastic Materials,” and
(viii) ISO 9001:1994 “Quality Systems—Model for Quality Assurance in Design/Development, Production, Installation, and Servicing,” and
(3) American Society for Testing and Materials':
(i) F 75-92 “Specification for Cast Cobalt-28 Chromium-6 Molybdenum Alloy for Surgical Implant Material,”
(ii) F 648-98 “Specification for Ultra-High-Molecular-Weight Polyethylene Powder and Fabricated Form for Surgical Implants,”
(iii) F 799-96 “Specification for Cobalt-28 Chromium-6 Molybdenum Alloy Forgings for Surgical Implants,”
(iv) F 1044-95 “Test Method for Shear Testing of Porous Metal Coatings,”
(v) F 1108-97 “Titanium-6 Aluminum-4 Vanadium Alloy Castings for Surgical Implants,”
(vi) F 1147-95 “Test Method for Tension Testing of Porous Metal Coatings,”
(vii) F 1537-94 “Specification for Wrought Cobalt-28 Chromium-6 Molybdenum Alloy for Surgical Implants,” and
(viii) F 1672-95 “Specification for Resurfacing Patellar Prosthesis.”