PRESS-FIT STEM

K980473 · Encore Orthopedics, Inc. · LZO · Apr 16, 1998 · Orthopedic

Device Facts

• Record ID: K980473
• Device Name: PRESS-FIT STEM
• Applicant: Encore Orthopedics, Inc.
• Product Code: LZO · Orthopedic
• Decision Date: Apr 16, 1998
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 888.3353
• Device Class: Class 2
• Attributes: Therapeutic

Intended Use

The Press-fit Stem is intended for treatment of patients who are candidates for total or hemi-hip arthroplasty because the natural femoral head and neck have been affected by osteoarthritis, inflammatory arthritis, traumatic arthritis, rheumatoid arthritis, avascular necrosis or femoral neck fracture, and revision arthroplasty where bone loss is minimal. These devices are intended to aid the surgeon in relieving the patient of hip pain and restoring hip motion and are intended to be used in a press fit mode.

Device Story

Press-fit hip stem; straight femoral stem with trapezoidal proximal body; Morse type taper for modular head attachment. Fabricated from wrought Ti-6A1-4V; grit-blasted surface. Used in orthopedic surgery for total or hemi-hip arthroplasty; implanted by surgeons to relieve hip pain and restore motion. Device functions via press-fit fixation in the femoral canal. Benefits include restoration of joint function and pain relief for patients with degenerative or traumatic hip conditions.

Clinical Evidence

No clinical data. Bench testing only, including FEA fatigue analysis and Morse taper testing.

Technological Characteristics

Material: Wrought Ti-6A1-4V. Geometry: Straight femoral stem, trapezoidal proximal body. Fixation: Press-fit. Interface: Morse type taper for modular heads. Surface: Grit blasted. Sizes: 8. Energy source: None (mechanical).

Indications for Use

Indicated for patients requiring total or hemi-hip arthroplasty due to osteoarthritis, inflammatory arthritis, traumatic arthritis, rheumatoid arthritis, avascular necrosis, femoral neck fracture, or revision arthroplasty with minimal bone loss.

Regulatory Classification

Identification

A hip joint metal/ceramic/polymer semi-constrained cemented or nonporous uncemented prosthesis is a device intended to be implanted to replace a hip joint. This device limits translation and rotation in one or more planes via the geometry of its articulating surfaces. It has no linkage across-the-joint. The two-part femoral component consists of a femoral stem made of alloys to be fixed in the intramedullary canal of the femur by impaction with or without use of bone cement. The proximal end of the femoral stem is tapered with a surface that ensures positive locking with the spherical ceramic (aluminium oxide, A12 03 ) head of the femoral component. The acetabular component is made of ultra-high molecular weight polyethylene or ultra-high molecular weight polyethylene reinforced with nonporous metal alloys, and used with or without bone cement.

Submission Summary (Full Text)

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## 19806

APR 1 6 1998

## Summary of Safety and Effectiveness

Encore Orthopedics, Inc. 9800 Metric Blvd. Austin, TX 78758 [phone]

Press-Fit Stem Trade Name:

Common Name: Press-fit hip stem

Classification Name: Hip joint metal/polymer semi-constrained prosthesis per 21 CFR 888.3350 and Hip joint Femoral (hemi-hip) metallic uncemented prosthesis per 21 CFR 888.3360

The femoral stem is straight. The proximal body is trapezoidal in cross-sectional Description: geomety. A Morse type taper is used to receive modular heads.

The Press-Fit is fabricated from wrought Ti-6A1-4V. The entire stem is grit blasted. The stem is available in eight sizes.

Intended Use: The Press-Fit Stem is intended for treatment of patients who are candidates for total hip arthroplasty because the natural femoral head and neck have been affected by osteoarthritis and avascular necrosis; theumatoid 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, which is unmanageable using other techniques.

Comparable Features to Predicate Device(s): The Press-Fit Stem has similar geometry, is manufactured from the same material, and has the same indications as the predicate devices.

Test Results: Testing on this device included FEA fatigue analysis and testing on the Morse type taper.

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Image /page/1/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo features a stylized caduceus symbol, which is often associated with healthcare. The words "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" are arranged in a circular pattern around the symbol.

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

APR 1 6 1998

Ms. Debbie De Los Santos ·Requlatory/Clinical Specialist Encore Orthopedics, Inc. 9800 Metric Boulevard Austin, Texas 78758

Re: K980473 Press-Fit Stem Requlatory Class: II Product Codes: LZO, LWJ, and KWY Dated: February 5, 1998 Received: February 6, 1998

## Dear Ms. De Los Santos:

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 The general controls provisions of the Act 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 requlations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A 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 requlation may result in requlatory 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 requlations.

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Page 2 - Ms. Debbie De Los Santos

This letter will allow you to begin 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,

Stephen Edwards

M. Witten, Ph.D., M.D. 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): | K980 473 |
|---------------------------|-----------------------|
| Device Name: | Encore Press Fit Stem |

Indications For Use:

## Press-fit Stem Indications For Use

The Press-fit Stem is intended for treatment of patients who are candidates for total or hemi-hip arthroplasty because the natural femoral head and neck have been affected by osteoarthritis, inflammatory arthritis, traumatic arthritis, rheumatoid arthritis, avascular necrosis or femoral neck fracture, and revision arthroplasty where bone loss is minimal. These devices are intended to aid the surgeon in relieving the patient of hip pain and restoring hip motion and are intended to be used in a press fit mode.

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

Concurrence of CDRH, Office of Device Evaluation (ODE)

Prescription Use
(per 21 CFR 801.109) X

OR

Over-The-Counter Use

(Optional Format 1-2-96)_

Dlupton Plurla

al Restorative Devices 510(k) Number