CROSSFIRE SYSTEM 12 ACETABULAR INSERTS

K993352 · Howmedica Osteonics Corp. · LPH · Nov 19, 1999 · Orthopedic

Device Facts

• Record ID: K993352
• Device Name: CROSSFIRE SYSTEM 12 ACETABULAR INSERTS
• Applicant: Howmedica Osteonics Corp.
• Product Code: LPH · Orthopedic
• Decision Date: Nov 19, 1999
• Decision: SESE
• Submission Type: Special
• Regulation: 21 CFR 888.3358
• Device Class: Class 2
• Attributes: Therapeutic

Intended Use

The subject devices are single use components, intended for use in conjunction with associated acetabular shells, femoral bearings, and femoral hip stems as part of a cemented or cementless total hip replacement procedure. Indications for use, in keeping with those of other commercially available Class II total hip devices, are as follows: - noninflammatory degenerative joint disease including osteoarthritis and avascular necrosis, - rheumatoid arthritis, - correction of functional deformity, - revision procedures where other treatments or devices have failed, and - treatment of nonunion, femoral neck and trochanteric fractures of the proximal femur with head involvement that are unmanageable using other techniques.

Device Story

Crossfire™ System 12® Acetabular Inserts are UHMWPE hip replacement components; intended for use in cemented or cementless total hip arthroplasty. Device functions as a bearing surface within an acetabular shell; mates with femoral bearings and stems. Crossfire™ process involves crosslinking polyethylene to reduce wear rates. Used in clinical settings by orthopedic surgeons. Output is a mechanical bearing surface; clinical decision-making involves restoring joint function and mobility. Benefits include reduced wear compared to standard polyethylene, potentially extending implant longevity.

Clinical Evidence

Bench testing only. Fatigue loading of the smallest insert size (P1) assembled in metal backings for 10^7 cycles showed no structural compromise. Axial distraction testing confirmed sufficient locking strength pre- and post-fatigue. Wear performance was characterized via in vitro hip joint simulation (5 million cycles) using bovine calf serum, demonstrating 78-90% reduction in gravimetric wear compared to standard polyethylene. Note: in vitro results do not quantitatively predict clinical wear.

Technological Characteristics

UHMWPE per ASTM-F648; crosslinked via process cleared in K974685. Components are acetabular inserts for total hip replacement. Mechanical locking mechanism within acetabular shells. Single-use, sterile.

Indications for Use

Indicated for patients requiring total hip replacement due to noninflammatory degenerative joint disease (osteoarthritis, avascular necrosis), rheumatoid arthritis, functional deformity, revision needs, or proximal femur fractures (nonunion, femoral neck, trochanteric) with head involvement.

Regulatory Classification

Identification

A hip joint metal/polymer/metal semi-constrained porous-coated uncemented prosthesis is a device intended to be implanted to replace a hip 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 has a femoral component made of a cobalt-chromium-molybdenum (Co-Cr-Mo) alloy or a titanium-aluminum-vanadium (Ti-6Al-4V) alloy and an acetabular component composed of an ultra-high molecular weight polyethylene articulating bearing surface fixed in a metal shell made of Co-Cr-Mo or Ti-6Al-4V. The femoral stem and acetabular shell have a porous coating made of, in the case of Co-Cr-Mo substrates, beads of the same alloy, and in the case of Ti-6Al-4V substrates, fibers of commercially pure titanium or Ti-6Al-4V alloy. 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. The generic type of device has a design to achieve biological fixation to bone without the use of bone cement.

Predicate Devices

• Osteonics Polyethylene Acetabular Inserts (K974685)
• Howmedica System 12 Acetabular Inserts (K903362)
• Howmedica System 12 Acetabular Inserts (K951114)
• Howmedica System 12 Acetabular Inserts (K951115)
• Howmedica System 12 Acetabular Inserts (K934060)
• Howmedica System 12 Acetabular Inserts (K963612)

Submission Summary (Full Text)

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(993352

NOV 1 9 1999

Additional Crossfire™Acetabular Components

## 510(k) Summary

# Additional Crossfire™ Acetabular Components

Submission Information

| Name and Address of the Sponsor: | Howmedica Osteonics Corp. |
|----------------------------------|---------------------------|
| | 59 Route 17 |
| | Allendale, NJ 07401-1677 |
| Contact Person: | Terry Sheridan Powell |
| Date of Summary Preparation: | November 19, 1999 |

**Device Identification**

| Proprietary Name: | Crossfire™ System 12® Acetabular Inserts |
|-------------------|--------------------------------------------|
| Common Name: | Artificial Total Hip Replacement Component |
| | (Acetabular Inserts) |

| Classification Name and Reference: | 888.3358: Prosthesis, hip, semi-constrained, metal- |
|------------------------------------|-----------------------------------------------------|
| | polymer, porous, uncemented |

#### Predicate Device Identification

- Osteonics Polyethylene Acetabular Inserts, fabricated from crosslinked polyethylene . called "Crossfire", were determined Substantially Equivalent via 510(k) #K974685 on 12/16/97 (sponsor: Osteonics Corp.).

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.

- Howmedica System 120 Acetabular Inserts (non-Crossfire) were determined
Substantially Equivalent as follows:

- via 510(k) #K903362. These were room air irradiated versions, previously called -Osteolock inserts (sponsor: Howmedica Inc..).
- via 510(k) #K951114. These were room air irradiated versions, specifically for the . additional P1 26mm size.
- via 510(k) #K951115. These were room air irradiated versions, specifically for the additional 22mm sizes.
- via 510(k) #K934060. These were Duration® Stabilized versions. -
- via 510(k) #K963612. This submission allowed additional wear claims for the -Duration® Stabilized versions.

#### Device Description

The subject Crossfire™System 12® Acetabular Inserts are the same as the predicate non-Crossfire™System 12® Acetabular Inserts, except that the subject devices are fabricated from polyethylene that has been crosslinked via the procedure described in, and found Substantially Equivalent in, 510(k) #K974685.

#### Intended Use:

The subject devices are single use components, intended for use in conjunction with associated acetabular shells, femoral bearings, and femoral hip stems as part of a cemented or cementless total hip replacement procedure. Indications for use, in keeping with those of other commercially available Class II total hip devices, are as follows:

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- noninflammatory degenerative joint disease including osteoarthritis and avascular . necrosis,
Necrosis,

- rheumatoid arthritis, .
- correction of functional deformity, .
- . revision procedures where other treatments or devices have failed, and
- treatment of nonunion, femoral neck and trochanteric fractures of the proximal femur . with head involvement that are unmanageable using other techniques.

#### Statement of Technological Comparison:

#### Materials

The subject and predicate Crossfire™ System 120 Acctabular Inserts are manufactured from UHMWPE per ASTM-F648. The UNMWPE material to be used for the subject System 120 Acetabular Inserts will be crosslinked in exactly the same manner used for the acetabular inserts determined Substantially Equivalent via K974685.

### Indications for Use

The indications for use of the subject and predicate System 12@ Acetabular Inserts are identical.

#### Design

The subject (Crossfire) and predicate (non-Crossfire) System 12@ Acetabular Inserts are identical in design. Additional testing has been performed on Crossfire™ versions of the System 12@ Acetabular Inserts to validate that these inserts are not adversely affected, with regard to locking strength or fatigue strength, as a result of the Crossfire™ process.

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510(k) Summary

#### Additional Crossfire™Acetabular Components Performance Data:

Crossfire polyethylene has been well characterized previously under 510(k) #K974685. Testing of the subject acetabular inserts, therefore, focused on the structural aspects of System 12 inserts assembled within Howmedica-design (e.g., Osteolock) acetabular shells.

The smallest insert size (P1) was assembled within metal backings and fatigue loaded. After 107 cycles, three inserts were axially distracted (pushed-out) and two were carefully removed by sectioning their metal shells. All inserts were inspected for signs of structural compromise with no gross evidence of impending catastrophic failure. Other surface features, e.g. screw hole impressions, were consistent with those observed in an earlier study used to originally qualify Osteonics-design Crossfire inserts. Axial distraction test results demonstrated sufficient locking strength pre-and post- fatigue testing.

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Image /page/4/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo features a stylized image of a bird with three heads facing to the right. The text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" is arranged in a circular pattern around the bird image.

Public Health Service

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

NOV 1 9 1999

Ms. Elizabeth Staub ris. Birzabeen boaan
Vice President, Quality Assurance/Regulatory Affairs/Clinical Research Howmedica Osteonics Corporation 59 Route 17 07401-1677 Allendale, New Jersey

K993352 Re: Additional Crossfire™ Acetabular Components Trade Name: Regulatory Class: II Product Codes: LPH and JDI Dated: November 4, 1999 Received: November 8, 1999

Dear Ms. Staub:

We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to 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). 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.

If your device is classified (see above) into either class II (Special Controls) or class III (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. ਜੋ substantially equivalent determination assumes compliance with the current Good Manufacturing Practice requirement, as set forth in the Quality System Regulation (QS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic (QS) inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory In addition, FDA may publish further announcements action. concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 531 through 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.

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#### Page 2 - Ms. Elizabeth Staub

This letter will allow you to beqin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results 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 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at [phone]. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at [phone]. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll-free number [phone] or [phone] or at its internet address "http://www.fda.gov/cdrh/dsmamain.html".

Sincerely yours,

Russell J. Tayer

for James E. Dillard III Acting Director Division of General and Restorative Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

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## 510(k) Number (if known): K 993352

Device Name: Additional Crossfire™ Acetabular Components

Indications For Use:

The subject devices are single use components, intended for use in conjunction with associated acetabular shells, femoral bearings, and femoral hip stems as part of a cemented or cementless total hip replacement procedure. Indications for use, in keeping with those of other commercially available Class II total hip devices, are as follows:

- noninflammatory degenerative joint disease including osteoarthritis and avascular necrosis, .
- . rheumatoid arthritis,
- . correction of functional deformity,
- revision procedures where other treatments or devices have failed, and .
- treatment of nonunion, femoral neck and trochanteric fractures of the proximal femur with . head involvement that are unmanageable using other techniques.

The additional Crossfire™ Acetabular Inserts include the following devices:

- System 12® Acetabular Inserts .
(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of CDRH, Office of Device Evaluation (ODE)

Russell Lozano SUTTO

Division Sign-Off Restorative Devices Division of Gene 79587 510(k) Number.

Prescription Use a (Per 21 CFR 801.109)

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OR

Over-The-Counter Use

(Optional Format 1-2-96)

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#### Wear Claims:

The Howmedica Osteonics Crossfire Polyethylene Acetabular Inserts, 2041C-2850, show a 90% reduction in gravimetric wear rate versus the same acetabular inserts fabricated from standard polyethylene, 2041-2850. These inserts mate with a 50mm acetabular shell, have a 10° elevated rim, a 28mm inner diameter, and a 9,4mm bearing thickness. Testing was performed under multiaxial hip ioint simulation for 5 million cycles, using a 28mm CoCr articulating counterface and a bovine calf serum lubricant. The results of in vitro hip wear simulator tests have not been shown to quantitatively predict clinical wear performance.

The Howmedica Osteonics Crossfire Polyethylene Acetabular Inserts, 2041C-2850, show an 88% reduction in gravimetric wear rate versus the same acetabular inserts fabricated from standard polyethylene, 2041-2850, when evaluated following an accelerated aging cycle. These inserts mate with a 50mm acetabular shell, have a 10° elevated rim, a 28mm inner diameter, a 9.4mm bearing thickness, and were aged under 80°C in air for 14 days. Testing was performed under multiaxial hip joint simulation for 5 million cycles, using a 28mm CoCr articulating counterface and a bovine calf serum lubricant. The results of in vitro hip wear simulator tests have not been shown to quantitatively predict clinical wear performance.

The Howmedica Osteonics Crossfire Polyethylene Acetabular Inserts, 2041C-2850, show a 78% reduction in gravimetric wear rate versus the same acetabular inserts fabricated from standard polyethylene, 2041-2850, when evaluated under abrasive wear conditions. These inserts mate with a 50mm acetabular shell, have a 10° elevated rim, a 28mm inner diameter, and a 9.4mm bearing thickness. Testing was performed under multiaxial hip joint simulation for 5 million cycles, using a 28mm CoCr articulating counterface, a bovine calf serum lubricant, and an abrasive media of bone cement particulate. The results of in vitro hip wear simulator tests have not been shown to quantitatively predict clinical wear performance.