Identity Shoulder System

• K Number: K250848
• Device Name: Identity Shoulder System
• Manufacturer: Zimmer Inc.
• Date Cleared: 2025-07-02 ( 104 days)
• Product Code: MBF , HSD , KWS , KWT , PHX , PKC
• Regulation Number: 888.3670
• Type: Traditional
• Panel: Orthopedic
• Reference & Predicate Devices: N/A
• Predicate For: N/A

Intended Use

Hemiarthoplasty/Conventional Total Application:

• Non-inflammatory degenerative joint disease including osteoarthritis and avascular necrosis.
• Rheumatoid arthritis.
• Correction of functional deformity.
• Fractures of the proximal humerus, where other methods of treatment are deemed inadequate.
• Difficult clinical management problems, including cuff arthropathy, where other methods of treatment may not be suitable or may be inadequate.

Optional use in revision: in some medical conditions (e.g. revision when healthy and good bone stock exists), the surgeon may opt to use primary implants in a revision procedure.

Reverse Application:

Zimmer Biomet Reverse Shoulder products are indicated for use in patients whose shoulder joint has a grossly deficient rotator cuff with severe arthropathy and/or previously failed shoulder joint replacement with a grossly deficient rotator cuff. The patient must be anatomically and structurally suited to receive the implants, and a functional deltoid muscle is necessary.

The Zimmer Biomet Reverse Shoulder is indicated for primary, fracture, or revision total shoulder replacement for the relief of pain and significant disability due to gross rotator cuff deficiency.

The assembled humeral component may be used alone for hemiarthroplasty or combined with the glenoid component or reverse components for total shoulder arthroplasty (conventional or reverse applications). The humeral components may be used cemented or uncemented (biological fixation).

The Titanium Humeral Head and Glenosphere components are indicated for patients with suspected cobalt alloy sensitivity. The wear properties of Titanium and Titanium alloys are inferior to that of cobalt alloy. A Titanium humeral head or Glenospheres not recommended for patients who lack suspected material sensitivity to cobalt alloy.

Comprehensive Nano Stemless Shoulder System

1. Primary total shoulder arthroplasty.
2. Non-inflammatory degenerative joint disease including

Comprehensive Nano Stemless Shoulder humeral components have a porous coated surface coating and are indicated for uncemented biological fixation applications.

The Comprehensive Modular Hybrid Glenoid is intended to be implanted with bone cement. The porous titanium peg may be inserted without bone cement.

Device Description

The Identity Shoulder System is previously cleared (K213856/K240876) as a comprehensive collection of components designed with the intention of providing the modularity and adaptability necessary to facilitate individual anatomical adjustment and restoration of the glenohumeral joint during shoulder arthroplasty. The Identity Shoulder System is cleared for hemi-arthroplasty and conventional total shoulder replacement in both the anatomic and reverse configurations. The current submission is for the anatomic configuration.

The subject Comprehensive Humeral Head Adapter (CHHA) is a line extension to the Identity Shoulder System (K213856) cleared for the hemi-arthroplasty configuration and anatomic Total Shoulder Configuration.

The new CHHA (PN SAHHA002) allows additional compatibility with the previously cleared Identity Humeral Heads (K213856) and the Comprehensive humeral components, excluding fracture stems, as noted below:

• Comprehensive Humeral Stems (K193038); and
• Comprehensive Nano Stemless shoulder component (K182516).

AI/ML Overview

Based on the provided FDA 510(k) clearance letter for the "Identity Shoulder System" (K250848), here's an analysis of the acceptance criteria and the study that proves the device meets them:

Crucial Observation: The provided document is a 510(k) clearance letter for a medical device that does not appear to be software or an AI/ML enabled device. It is for an orthopedic implant (shoulder system). Therefore, several of the requested points related to AI/ML (e.g., sample size for training set, number of experts for ground truth, MRMC studies, standalone algorithm performance) are not applicable to this type of traditional medical device submission.

The "acceptance criteria" for this device are generally based on non-clinical performance testing to demonstrate the device's physical and mechanical properties meet established standards and are substantially equivalent to predicate devices. There are no "reported device performance" metrics in the sense of clinical performance (like sensitivity/specificity for AI, diagnostic accuracy, etc.) because it's a physical implant, not a diagnostic or AI-driven system.

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Acceptance Criteria and Study Details (Based on the provided document)

Since the document provided is for a physical orthopedic implant, the "acceptance criteria" and "study" are interpreted in the context of demonstrating substantial equivalence for a traditional medical device, primarily through non-clinical performance testing.

1. Table of Acceptance Criteria and Reported Device Performance

Acceptance Criteria Category	Specific Test/Evaluation	Acceptance Criteria (Implicit for Substantial Equivalence)	Reported Device Performance (Summary from Document)
Mechanical Performance	Fatigue Verification	Device withstands specified cyclic loading without failure, demonstrating durability comparable to predicates.	Non-clinical verification successfully performed.
	Fretting Corrosion Verification	Device components resist fretting corrosion under specified conditions, comparable to predicates.	Non-clinical verification successfully performed.
	Fixation Stability Verification	Device maintains stable fixation under simulated physiological loads, comparable to predicates.	Non-clinical verification successfully performed.
	Static Modular Junction Strength Verification	Modular junctions maintain integrity and strength under static loads, comparable to predicates.	Non-clinical verification successfully performed.
Compatibility	ROM Verification	Device allows for intended range of motion when implanted, comparable to predicates.	Non-clinical verification successfully performed.
Imaging Compatibility	MRI Verification	Device is compatible with MRI (e.g., minimal artifact, no excessive heating), comparable to predicates.	Non-clinical verification successfully performed.
Material Equivalence	Materials composition	Identical to legally marketed predicate devices.	"Identical to predicates"
Design Equivalence	Design Features	Similar to legally marketed predicate devices, with any differences not raising new safety/effectiveness concerns.	"Similar to predicates"
Packaging Equivalence	Packaging	Identical to legally marketed predicate devices, ensuring sterility and protection.	"Identical to predicates"
Sterilization Equivalence	Sterilization Method	Identical to legally marketed predicate devices, ensuring sterility.	"Identical to predicates"
Intended Use Equivalence	Intended Use	Identical to legally marketed predicate devices.	"Identical to predicates"
Indications for Use Equivalence	Indications for Use	Identical to legally marketed predicate devices.	"Identical to predicates"

Note: For traditional orthopedic implants, specific numerical values for acceptance criteria and device performance (e.g., "Fatigue life > X cycles at Y load") are typically contained within the full 510(k) submission and are not usually detailed in the public clearance letter. The letter only states that these verifications were "successfully performed" and support the conclusion of substantial equivalence.

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AI/ML Specific Questions (Answered as "Not Applicable" for this device)

Given that this is a 510(k) for a physical orthopedic implant and not an AI/ML device, the following points are not applicable (N/A):

2. Sample sizes used for the test set and the data provenance: N/A. This device does not have a "test set" of patient data in the typical sense for AI/ML validation involving images or clinical parameters. Its evaluation involves mechanical testing of physical samples.
3. Number of experts used to establish the ground truth for the test set and the qualifications of those experts: N/A. Ground truth establishment by experts for clinical data is not relevant for this device.
4. Adjudication method (e.g. 2+1, 3+1, none) for the test set: N/A. This applies to review of clinical data, not 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: N/A. MRMC studies are for evaluating human reader performance, typically with diagnostic images, in conjunction with AI. This is not a diagnostic or AI-assisted device.
6. If a standalone (i.e. algorithm only without human-in-the-loop performance) was done: N/A. This device is not an algorithm.
7. The type of ground truth used (expert consensus, pathology, outcomes data, etc.): N/A. The "ground truth" for this device's performance is derived from standardized mechanical testing methods and compliance with material specifications.
8. The sample size for the training set: N/A. This device does not use a "training set" as it's not an AI/ML model.
9. How the ground truth for the training set was established: N/A.

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Summary of the Study:

The "study" that proves the device meets the acceptance criteria is described as a series of non-clinical verifications. These tests are designed to objectively assess the physical and mechanical properties of the Comprehensive Humeral Head Adapter (CHHA) and its compatibility within the Identity Shoulder System, thereby demonstrating its substantial equivalence to previously cleared predicate devices.

The specific non-clinical tests performed include:

• Fatigue Verification: Assesses the device's ability to withstand repeated stress without failure, simulating long-term use.
• Fretting Corrosion Verification: Evaluates the device's resistance to material degradation caused by small-amplitude oscillatory motion between contacting surfaces.
• Fixation Stability Verification: Confirms the secure attachment and stability of components under load.
• Static Modular Junction Strength Verification: Measures the strength of the connections between modular parts under static loading conditions.
• ROM Verification: Ensures the device allows for the intended range of motion within the joint.
• MRI Verification: Confirms the device's safety and compatibility when exposed to magnetic resonance imaging environments.

The results of these tests, along with the asserted identicality of intended use, indications for use, materials, packaging, and sterilization, and similarity in design features, were deemed sufficient by the FDA to conclude that:

• any differences do not raise different questions of safety and effectiveness; and
• the proposed device is as safe and effective as the legally marketed predicate device.

This conclusion of substantial equivalence is the basis for the 510(k) clearance for the Identity Shoulder System's new line extension, the Comprehensive Humeral Head Adapter.

Summary

U.S. Food & Drug Administration 510(k) Clearance Letter

Page 1

U.S. Food & Drug Administration
10903 New Hampshire Avenue Doc ID# 04017.07.05
Silver Spring, MD 20993
www.fda.gov

July 2, 2025

Zimmer Inc.
Deanna Strombeck
Regulatory Affairs Specialist
1800 W. Center Street
Warsaw, Indiana 46580

Re: K250848
Trade/Device Name: Identity Shoulder System
Regulation Number: 21 CFR 888.3670
Regulation Name: Shoulder joint metal/polymer/metal nonconstrained or semi-constrained porous-coated uncemented prosthesis
Regulatory Class: Class II
Product Code: MBF, KWS, HSD, KWT, PKC, PHX
Dated: May 20, 2025
Received: May 30, 2025

Dear Deanna Strombeck:

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.

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K250848 - Deanna Strombeck Page 2

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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K250848 - Deanna Strombeck Page 3

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,

Farzana Sharmin, 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

Page 4

Food and Drug Administration
Indications for Use
Form Approved: OMB No. 0910-0120
Expiration Date: 07/31/2026
See PRA Statement below.

DEPARTMENT OF HEALTH AND HUMAN SERVICES

Submission Number (if known): K250848
Device Name: Identity Shoulder System

Indications for Use (Describe)

Hemiarthoplasty/Conventional Total Application:

• Non-inflammatory degenerative joint disease including osteoarthritis and avascular necrosis.
• Rheumatoid arthritis.
• Correction of functional deformity.
• Fractures of the proximal humerus, where other methods of treatment are deemed inadequate.
• Difficult clinical management problems, including cuff arthropathy, where other methods of treatment may not be suitable or may be inadequate.

Optional use in revision: in some medical conditions (e.g. revision when healthy and good bone stock exists), the surgeon may opt to use primary implants in a revision procedure.

Reverse Application:

Zimmer Biomet Reverse Shoulder products are indicated for use in patients whose shoulder joint has a grossly deficient rotator cuff with severe arthropathy and/or previously failed shoulder joint replacement with a grossly deficient rotator cuff. The patient must be anatomically and structurally suited to receive the implants, and a functional deltoid muscle is necessary.

The Zimmer Biomet Reverse Shoulder is indicated for primary, fracture, or revision total shoulder replacement for the relief of pain and significant disability due to gross rotator cuff deficiency.

The assembled humeral component may be used alone for hemiarthroplasty or combined with the glenoid component or reverse components for total shoulder arthroplasty (conventional or reverse applications). The humeral components may be used cemented or uncemented (biological fixation).

The Titanium Humeral Head and Glenosphere components are indicated for patients with suspected cobalt alloy sensitivity. The wear properties of Titanium and Titanium alloys are inferior to that of cobalt alloy. A Titanium humeral head or Glenospheres not recommended for patients who lack suspected material sensitivity to cobalt alloy.

Type of Use (Select one or both, as applicable)
☑ Prescription Use (Part 21 CFR 801 Subpart D) ☐ Over-The-Counter Use (21 CFR 801 Subpart C)

CONTINUE ON A SEPARATE PAGE IF NEEDED.

Page 5

DEPARTMENT OF HEALTH AND HUMAN SERVICES
Food and Drug Administration
Indications for Use
Form Approved: OMB No. 0910-0120
Expiration Date: 06/30/2023
See PRA Statement below.

510(k) Number (if known): K250848
Device Name: Identity Shoulder System

Indications for Use (Describe)

Comprehensive Nano Stemless Shoulder System

1. Primary total shoulder arthroplasty.
2. Non-inflammatory degenerative joint disease including

Comprehensive Nano Stemless Shoulder humeral components have a porous coated surface coating and are indicated for uncemented biological fixation applications.

The Comprehensive Modular Hybrid Glenoid is intended to be implanted with bone cement. The porous titanium peg may be inserted without bone cement.

Type of Use (Select one or both, as applicable)
☑ Prescription Use (Part 21 CFR 801 Subpart D) ☐ Over-The-Counter Use (21 CFR 801 Subpart C)

CONTINUE ON A SEPARATE PAGE IF NEEDED.

This section applies only to requirements of the Paperwork Reduction Act of 1995.
DO NOT SEND YOUR COMPLETED FORM TO THE PRA STAFF EMAIL ADDRESS BELOW.

The burden time for this collection of information is estimated to average 79 hours per response, including the time to review instructions, search existing data sources, gather and maintain the data needed and complete and review the collection of information. Send comments regarding this burden estimate or any other aspect of this information collection, including suggestions for reducing this burden, to:

Department of Health and Human Services
Food and Drug Administration
Office of Chief Information Officer
Paperwork Reduction Act (PRA) Staff
[e-mail]

"An agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays a currently valid OMB number."

Page 6

510(k) Summary

In accordance with content and format of a 510(k) summary (21 CFR §807.92) and the Safe Medical Devices Act of 1990, the following information is provided for the Identity Shoulder System 510(k) premarket notification. The submission was prepared in accordance with the FDA guidance document, 'Format for Traditional and Abbreviated 510(k)s', issued on September 13, 2019.

Sponsor: Zimmer Inc.
P.O. Box 708
1800 W. Center Street
Warsaw, IN 46580
Establishment Registration Number: 1822565

Contact Person: Deanna Strombeck
Regulatory Affairs Specialist
Telephone: [phone]
[e-mail]

Date: March 20, 2025

Subject Device:
Trade Name: Comprehensive Humeral Head Adapter
Common Name: Shoulder Head Adapter
Classification Name:

• MBF – Prosthesis, – Shoulder joint metal/polymer/metal nonconstrained or semi-constrained porous-coated uncemented prosthesis (21 CFR 888.3670)
• KWT - Shoulder joint metal/polymer nonconstrained cemented prosthesis (21 CFR 888.3650)
• KWS - Shoulder joint metal/polymer semi-constrained cemented prosthesis (21 CFR 888.3660)
• HSD - Shoulder joint humeral (hemi-shoulder) metallic uncemented prosthesis (21 CFR 888.3690)
• PHX - Shoulder joint metal/polymer semi-constrained cemented prosthesis (21 CFR 888.3660)
• PKC - Prosthesis, Shoulder joint metal/polymer semi-constrained cemented prosthesis (21 CFR 888.3660)

Predicate Device(s):
Primary Predicate Device
K213856 Identity Shoulder System

Reference Predicate
K182516 Comprehensive Nano Stemless Shoulder
K193038 Comprehensive Shoulder System

K250848
Page 1 of 4

Page 7

K214001 Comprehensive Shoulder System, Comprehensive Reverse Shoulder System (MR labeling)

Purpose and Device Description: The Identity Shoulder System is previously cleared (K213856/K240876) as a comprehensive collection of components designed with the intention of providing the modularity and adaptability necessary to facilitate individual anatomical adjustment and restoration of the glenohumeral joint during shoulder arthroplasty. The Identity Shoulder System is cleared for hemi-arthroplasty and conventional total shoulder replacement in both the anatomic and reverse configurations. The current submission is for the anatomic configuration.

The subject Comprehensive Humeral Head Adapter (CHHA) is a line extension to the Identity Shoulder System (K213856) cleared for the hemi-arthroplasty configuration and anatomic Total Shoulder Configuration.

The new CHHA (PN SAHHA002) allows additional compatibility with the previously cleared Identity Humeral Heads (K213856) and the Comprehensive humeral components, excluding fracture stems, as noted below:

• Comprehensive Humeral Stems (K193038); and
• Comprehensive Nano Stemless shoulder component (K182516).

Intended Use and Indications for Use:

Comprehensive Humeral Head Adapter with Identity Shoulder System

Hemiarthoplasty/Conventional Total Application:

• Non-inflammatory degenerative joint disease including osteoarthritis and avascular necrosis.
• Rheumatoid arthritis.
• Correction of functional deformity.
• Fractures of the proximal humerus, where other methods of treatment are deemed inadequate.
• Difficult clinical management problems, including cuff arthropathy, where other methods of treatment may not be suitable or may be inadequate.

Optional use in revision: in some medical conditions (e.g. revision when healthy and good bone stock exists), the

K250848
Page 2 of 4

Page 8

surgeon may opt to use primary implants in a revision procedure.

Reverse Application:

Zimmer Biomet Reverse Shoulder products are for use in patients whose shoulder join has a grossly deficient rotator cuff with severe arthropathy and/or previously failed shoulder joint replacement with a grossly deficient rotator cuff. The patient must be anatomically and structurally suited to receive the implants and a functional deltoid muscle is necessary.

The Zimmer Biomet Reverse Shoulder is indicated for primary, fracture, or revision total shoulder replacement for the relief of pain and significant disability due to gross rotator cuff deficiency.

The assembled humeral component may be used alone for hemiarthroplasty or combined with the glenoid component or reverse components for total shoulder arthroplasty (conventional or reverse applications). The humeral components may be used cemented or uncemented (biological fixation).

The Titanium Humeral Head and Glenosphere components are indicated for patients with suspected cobalt alloy sensitivity. The wear properties of Titanium and Titanium alloys are inferior to that of cobalt alloy. A Titanium humeral head or Glenospheres not recommended for patients who lack suspected material sensitivity to cobalt alloy.

Comprehensive Humeral Head Adapter with Nano Stemless Shoulder System

1. Primary total shoulder arthroplasty.
2. Non-inflammatory degenerative joint disease including osteoarthritis.

Comprehensive Nano Stemless Shoulder humeral components have a porous coated surface coating and are indicated for uncemented biological fixation applications.

K250848
Page 3 of 4

Page 9

The Comprehensive Modular Hybrid Glenoid is intended to be implanted with bone cement. The porous titanium peg may be inserted without bone cement.

Summary of Technological Characteristics: The rationale for substantial equivalence is based on consideration of the following characteristics:

• Intended Use: Identical to predicates
• Indications for Use: Identical to predicates
• Materials: Identical to predicates
• Design Features: Similar to predicates
• Packaging: Identical to predicates
• Sterilization: Identical to predicates

Summary of Performance Data (Nonclinical and/or Clinical)

Non-Clinical Verifications:

• Fatigue, Fretting Corrosion and Fixation Stability Verification
• ROM Verification
• Static Modular Junction Strength Verification
• MRI Verification

Clinical Tests:

• None provided

Substantial Equivalence Conclusion: The proposed CHHA created as a line extension in this 510(k) for the Identity Shoulder System has the same intended use and indications for use as the primary predicate device. The proposed device has similar technological characteristics to the predicates, and the information provided herein demonstrates that:

• any differences do not raise different questions of safety and effectiveness; and
• the proposed device is as safe and effective as the legally marketed predicate device.

K250848
Page 4 of 4

Regulation Number and Section

§ 888.3670 Shoulder joint metal/polymer/metal nonconstrained or semi-constrained porous-coated uncemented prosthesis.

(a)
Identification. A shoulder joint metal/polymer/metal nonconstrained or semi-constrained porous-coated uncemented prosthesis is a device intended to be implanted to replace a shoulder joint. The device limits movement in one or more planes. It has no linkage across-the-joint. This generic type of device includes prostheses that have a humeral component made of alloys such as cobalt-chromium-molybdenum (Co-Cr-Mo) and titanium-aluminum-vanadium (Ti-6Al-4V) alloys, and a glenoid resurfacing component made of ultra-high molecular weight polyethylene, or a combination of an articulating ultra-high molecular weight bearing surface fixed in a metal shell made of alloys such as Co-Cr-Mo and Ti-6Al-4V. The humeral component and glenoid backing have a porous coating made of, in the case of Co-Cr-Mo components, beads of the same alloy or commercially pure titanium powder, and in the case of Ti-6Al-4V components, beads or fibers of commercially pure titanium or Ti-6Al-4V alloy, or commercially pure titanium powder. The porous coating has a volume porosity between 30 and 70 percent, an average pore size between 100 and 1,000 microns, interconnecting porosity, and a porous coating thickness between 500 and 1,500 microns. This generic type of device is designed to achieve biological fixation to bone without the use of bone cement.(b)
Classification. Class II (special controls). The special control for this device is FDA's “Class II Special Controls Guidance: Shoulder Joint Metal/Polymer/Metal Nonconstrained or Semi-Constrained Porous-Coated Uncemented Prosthesis.”