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Cormet Hip Resurfacing System - P050016

This is a brief overview of information related to FDA’s approval to market this product. See the links below to the Summary of Safety and Effectiveness Data (SSED) and product labeling for more complete information on this product, its indications for use, and the basis for FDA’s approval.

Product Name: Cormet Hip Resurfacing System
PMA Applicant: Corin USA
Address: 10500 University Center Drive, Ste 190, Tampa, Florida 33612
Approval Date: July 3, 2007
Approval Letter: http://www.fda.gov/cdrh/pdf5/p050016a.pdf

What is it? The Cormet Hip Resurfacing System is a metal on metal resurfacing artificial hip replacement system, surgically implanted to replace a hip joint. The Cormet System is called a resurfacing prosthesis because only the surface of the femoral head (ball) is removed to implant the femoral head resurfacing component.

How does it work? The Cormet System has two parts: a socket in the shape of a shallow cup (acetabular component), and a cap in the form of a ball head (femoral resurfacing component).

• The cup replaces the damaged surface of your hip socket (acetabulum).
• The cap covers the ball-shaped bone at the top of your thigh (femoral head), and the cap has a small stem that is inserted into the top of your thighbone.

The cap moves within the cup. The surfaces that rub against each other (the bearing couple) are made from highly-polished metal. This type of bearing couple is called a metal-on-metal bearing couple.

When is it used? The Cormet System relieves hip pain and improves hip function by replacing the parts of your hip that have been severely damaged by degenerative joint diseases. Degenerative joint diseases include osteoarthritis, rheumatoid arthritis, traumatic arthritis, dysplasia, or avascular necrosis.

The Cormet System is intended for patients who, due to their relatively younger age or increased activity level, may not be suitable for traditional total hip replacement due to an increased possibility of requiring future hip joint revision.

What will it accomplish? Cormet System intended to relieve pain and improve hip function.

When should it not be used? The Cormet System should not be used in:

• Patients with active or suspected infection in or around the hip joint;
• Patients who are skeletally immature;
• Patients with bone stock inadequate to support the device including:
  • Patients with severe osteopenia should not receive the Cormet Hip Resurfacing System procedure. Patients with a family history of severe osteoporosis or severe osteopenia;
  • Patients with osteonecrosis or avascular necrosis (AVN) with >50% involvement of the femoral head (regardless of FICAT Grade) should not receive a Cormet Hip Resurfacing device;
  • Patients with multiple cysts of the femoral head (>1cm) should not receive a Cormet Hip Resurfacing device;
  • Note – In cases of questionable bone stock, a DEXA scan may be necessary to assess inadequate bone stock.
• Patients with any vascular insufficiency, muscular atrophy, or neuromuscular disease severe enough to compromise implant stability or postoperative recovery;
• Females of child bearing age due to unknown effects on the fetus of metal ion release.
• Patients with known moderate or severe renal insufficiency;
• Patients who are immunosuppressed with diseases such as AIDS or persons receiving high doses of corticosteroids;
• Patients who are severely overweight;
• Patients with known or suspected metal sensitivity (e.g., jewelry).
  

Additional information: The Summary of Safety and Effectiveness and labeling are be available at: http://www.fda.gov/cdrh/pdf5/p050016.html

Other:

• Comprehensive hip implant website; some examples are listed below:
  http://www.nlm.nih.gov/medlineplus/hipinjuriesanddisorders.html#diagnosissymptoms
  
• Slide show on hip replacement (must have Adobe Acrobat Reader to access):
  http://www.nlm.nih.gov/medlineplus/tutorials/hipreplacement.html
  
• Illustrated hip replacement:
  http://www.nlm.nih.gov/medlineplus/ency/presentations/100006_1.htm
  
• Comprehensive list of things to help after hip surgery:
  http://orthoinfo.aaos.org/fact/thr_report.cfm?Thread_ID=274&topcategory=Hip
  
• Diet, home safety tips to avoid hip injury:
  http://orthoinfo.aaos.org/brochure/thr_report.cfm?Thread_ID=25&topcategory=Hip
  
  

Updated July 27, 2007

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