HORIZON HIP SYSTEM

K962769 · Biologically Oriented Prostheses · LPH · Oct 3, 1996 · Orthopedic

Device Facts

• Record ID: K962769
• Device Name: HORIZON HIP SYSTEM
• Applicant: Biologically Oriented Prostheses
• Product Code: LPH · Orthopedic
• Decision Date: Oct 3, 1996
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 888.3358
• Device Class: Class 2
• Attributes: Therapeutic

Intended Use

Both systems are indicated for treatment of osteoarthritis, rheumatoid arthritis, avascular necrosis, and traumatic arthritis. Contraindications include: excessive bone loss, septic arthritis, periarticular osteomyelitis, and local or systemic infection.

Device Story

The Horizon Hip System is a total hip prosthesis consisting of a cobalt chrome femoral stem, a cobalt chrome acetabular shell, and a UHMWPE acetabular insert. The system is used by orthopedic surgeons in a clinical setting to replace a diseased hip joint. The femoral stem features a collar for stress distribution and is available with or without porous coating. The acetabular shell includes three spikes for anti-rotation and a locking groove for the insert. The insert snaps into the shell to accommodate 28mm or 32mm femoral heads. By replacing the damaged joint, the device aims to restore hip function and reduce pain associated with arthritis or necrosis.

Clinical Evidence

No clinical data provided; bench testing only.

Technological Characteristics

Materials: Cobalt chrome (femoral stem, acetabular shell), UHMWPE (acetabular insert). Design: Porous coating for fixation, 3-spike acetabular shell for anti-rotation, snap-fit insert locking mechanism. Dimensions: Femoral stems (12-18mm), acetabular shells (46-60mm), inserts (28/32mm heads).

Indications for Use

Indicated for patients requiring total hip arthroplasty due to osteoarthritis, rheumatoid arthritis, avascular necrosis, or traumatic arthritis. Contraindicated in patients with excessive bone loss, septic arthritis, periarticular osteomyelitis, or local/systemic infection.

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

• Depuy AML femoral stems (K962769)
• AML Plus Depuy cup (K962769)

Submission Summary (Full Text)

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K96 2769
510 (k) Summary
OCT - 3 1996

**Submitted By:** Biopro
17 17th Street
Port Huron, MI 48060

**Contact:** Cheryl Warsinske
[phone]
Fax [phone]

**Device Information:**
proprietary name: Horizon Hip System
common name: prosthetic, Total Hip System
classification name: prosthetic, Total Hip System

**Femoral component**
The Horizon Femoral Stem is manufactured from cobalt chrome and features a collar to distribute stress in a physiological manner. It is available with or without porous coating. The femoral component is available in five sizes: 12mm, 13.5mm, 15mm, 16.5mm, and 18mm.

**Acetabular Insert**
The Horizon Acetabular Insert is manufactured of UHMWPE. It is designed to snap fit into the acetabular shell. The insert will accept 28mm and 32mm heads. It is offered in sizes ranging from 46mm to 60mm.

**Acetabular Shell (cup)**
The Horizon Acetabular Shell is manufactured of cobalt chrome. It features three spikes to prevent rotation. It also features a groove on its I.D. to accept the mating acetabular insert. The acetabular shell is porous coated to promote long term fixation. The acetabular shell is available in eight sizes: 46mm, 48mm, 50mm, 52mm, 54mm, 56mm, 58mm, and 60mm.

**Substantial Equivalence:**
The Horizon femoral stems are substantially equivalent to the Depuy AML femoral stems. Both styles have geometries which include a circular distal cross-section and an oval proximal cross-section for anti-rotation. Both styles are manufactured from cobalt chrome and are porous coated at least 5/8 of the way down the stem. The Horizon system also includes a non-porous coated stem option. Although both sets of stems have collars, the angle of the collar varies. The Horizon stems have a collar positioned at 20° from the horizontal, while the Depuy stems have a collar positioned at 45° from the horizontal. The collar positioned at 20° resists the joint loads more efficiently and reduces the shear stresses at the bone/implant interface. The mode of extraction for the stems also differs. The extraction instrument for the Horizon stems fits on the collar; whereas, the Depuy stems contain a hole in the proximal region to allow attachment of an extraction instrument. Additionally, the tapers present on the two stem styles differ. The Horizon taper is designed to accept a Biopro ceramic or cobalt chrome chrome head while a Depuy stem is designed to accept a Depuy head.

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The Horizon acetabular cup is substantially equivalent to the AML Plus Depuy cup. Both designs are porous coated on the entire O.D. of the shell and have three spikes projecting from the O.D. for stabilization and anti-rotation. The Horizon cup is manufactured from cobalt chrome and does not have any screw holes in it. This fact makes the joint more resistant to loosening because there is less particulate debris. On the other hand, the Depuy cup is made of titanium and has screw holes. The locking mechanisms for the two cups differ slightly. The Horizon cup has a locking lip around the I.D. to accommodate the insert. The Depuy cup contains rectangular grooves to accommodate its insert.

The acetabular inserts for both the Horizon hip system and the Depuy AML system are manufactured from UHMWPE. They have grooves for dialability and snap into the acetabular cup via their respective locking mechanisms. The Horizon insert is available with a 28mm I.D. or a 32mm I.D. The AML Depuy insert is available with a 26mm, 28mm, or 32mm I.D.

Although there are minor differences between the Horizon and Depuy components, they are substantially equivalent in form and function. Both systems are indicated for treatment of osteoarthritis, rheumatoid arthritis, avascular necrosis, and traumatic arthritis. Contraindications include: excessive bone loss, septic arthritis, periarticular osteomyelitis, and local or systemic infection.

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