Call Today for a FREE Confidential Case Review
Toll-Free 24/7 (866) 920-0753

Study Links Metal-on-Metal Hip Implants to Two-Year Failure

July 18, 2012 — Metal-on-metal hip implants fail because of loosening, metal reactions, pseudotumors, and seizing components. According to new research published in the journal Orthopedics has found that the hip implants tend to fail within two years. Furthermore, the most common reason for failure was a loosening of the acetabular cup. The two types of hip implants that were responsible for most of the failures were the ASR and the Zimmer Durom cups.

From a total of 80 patients undergoing revision surgery for problems with metal-on-metal hip implants, the researchers found the following complications and rates:

  • Aseptic acetabular loosening — 56.25%
  • Infection — 12.5%
  • Metal hypersensitivity — 6.25%
  • Failed resurfacing — 6.25%
  • Fracture — 5%
  • Loose stem — 3.75%
  • Seizing of device components — 1.25%
  • Cup malposition — 1.25%
  • Femoral stem fracture — 1.25%

The majority of patients who required revision surgery had a loosening of the acetabular hip cup, a complication that occurs when the round head of the femur falls out of the hip socket. This complication can cause severe pain and decreased ability to walk. Of the 45 cups that loosened, nearly 80% were Durom acetabular cups, and nearly 10% were the DePuy ASR cup. The remaining 10% were Magnum, Biomet, Pinnacle, or Conserve hip implants.

The researchers also found that metal-on-metal hip implants tended to fail within 2-3 years after the implant. Nearly 80% of patients had revision surgery within two years, and 92.5% of the patients had revision surgery within three years.

Furthermore, 13% of these patients had local tissue reactions. This side effect is likely caused by the effect of metal particles. When the metal-on-metal parts grind together, small particles of chromium debris accumulate in soft tissues around the hip implant. The chromium oxidizes, corrodes, and releases charged cobalt ions. Cobalt is known to be genotoxic, meaning that it can damage cellular DNA. Over time, this can lead to metal poisoning (metallosis), soft tissue reactions, necrotic (dead) tissue, bone loss, muscle damage, severe pain, swelling, inflammation, and the formation of pseudotumors.

The results of the study emphasize the fact that researchers are still trying to understand the safety and risks associated with metal-on-metal hip implants.

Do I have a Metal-on-Metal Hip Implant Lawsuit?

The Schmidt Firm, PLLC is currently accepting metal-on-metal hip implant induced injury cases in all 50 states. If you or somebody you know has been injured by a metal-on-metal hip implant, you should contact our lawyers immediately for a free case consultation. Please use the form below to contact our Defective Medical Device Litigation Group or call toll free 24 hours a day at (866) 920-0753.

Attention Lawyers: We consider a referral from another law firm to be one of the greatest compliments. If your firm is interested in referring us a case or for us to send you a list of previous award judgments and/or average referral fees, please visit the Lawyer Referral section of our website.

Free Case Evaluation

The Schmidt Firm, PLLC has been recognized as one of the nation’s leading plaintiffs' law firms and handles cases in all 50 states. We are very proud of our legal achievements, but equally self-respecting of our firm's reputation for providing personal attention to each and every client we represent.

No matter what type of case you have, you may contact us with confidence by filling out the email contact form below or calling us directly by dialing toll free 24 hrs/day (866) 920-0753.