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Metal-on-Metal Hip Implant Lawsuits 2023 Update

Metal-on-Metal Hip Lawsuits Update. Understanding the Implications and Outcomes

The medical community hailed metal-on-metal (MoM) hip implants as a revolutionary development for patients requiring hip replacements. However, over time, several concerns arose about these implants, leading to numerous lawsuits against manufacturers. This article delves into the background, health concerns, and legal implications surrounding metal-on-metal hip lawsuits.

Metal on Metal hip implants fail prematurely at a high rate and may need a revision surgery to correct

Metal on Metal hip implants fail prematurely at a high rate and may need revision surgery to correct

Background on Metal-on-Metal Hip Implants

Hip implants are medical devices surgically placed to replace damaged or deteriorated hip joints, aiming to relieve pain and improve mobility. Traditionally, hip implants were constructed using a combination of metal and plastic. However, in the quest to design a more durable implant, manufacturers introduced metal-on-metal hip designs. The belief was that these would wear down less over time and last longer than their predecessors.

Health Issues Linked to Metal-on-Metal Hips:

Shortly after their introduction, problems began emerging. Patients began reporting various complications, the most alarming of which was metallosis, a condition where metal debris released from the implant enters the bloodstream and surrounding tissues.

Key issues associated with MoM hip implants include:

  • Metallosis: This condition arises when metallic debris sheds from the hip implant, causing inflammation, tissue death, and even bone deterioration.
  • Pseudotumors: Some patients developed non-cancerous growths in the tissues surrounding their implants.
  • Loosening and fracturing: Many reported their implants becoming loose or even fracturing, causing extreme pain and necessitating further surgeries.

Metallosis is metal poisoning that can occur as a result of the release of metal particles into the body. In the context of hip replacements and other joint prostheses, metallosis typically refers to the build-up of metal debris in the soft tissues of the body due to wear or corrosion of metal-on-metal joint replacements.

Key Points about Metallosis

  1. Origin: In metal-on-metal joint replacements, two metal surfaces grind against each other. Over time, this movement can produce tiny metal particles that are released into the bloodstream or surrounding tissues.
  2. Symptoms: Symptoms of metallosis can vary but often include:
    • Pain at the site of the implant
    • Swelling
    • Limited mobility
    • A change in the position of the implant
    • Localized tissue death (necrosis)
    • Formation of cyst-like pseudotumors
  3. Systemic Effects: There is concern that elevated metal ion levels in the bloodstream from a failing MoM joint replacement could have systemic effects, potentially impacting the heart, nervous system, and other organs.
  4. Diagnosis: Metallosis is typically diagnosed based on symptoms, the history of a metal-on-metal joint replacement, and imaging tests such as MRI. Blood tests may also be used to measure the level of metal ions in the bloodstream.
  5. Treatment: Treatment often involves removing or revising the failing joint replacement. In some cases, damaged tissue may also need to be removed.

The issues related to metallosis and MoM joint replacements have led to numerous lawsuits against manufacturers, as mentioned in the earlier articles. Furthermore, it has prompted a shift in the medical community away from MoM devices in favor of alternative materials that are less likely to cause similar complications.

Both cobalt and chromium are metals that are often used in the construction of metal-on-metal hip implants and other joint prostheses. When these implants wear down or corrode, they can release cobalt and chromium particles into the bloodstream, leading to elevated blood levels of these metals. Elevated levels can serve as an indication of a failing MoM joint replacement and the potential for metallosis.

Cobalt and Chromium Blood Levels in the Diagnosis of Metallosis:

  1. Why They Matter: As the metals wear from the implant, they can leach into the surrounding tissues and the bloodstream. Elevated blood levels of these metals can indicate that there’s significant wear or other problems with a MoM implant.
  2. Normal Blood Levels:
    • Cobalt: Typically, blood cobalt concentrations are less than 0.5 micrograms per liter (µg/L).
    • Chromium: Normally, chromium levels are less than 0.5 µg/L.
  3. Elevated Levels:
    • For patients with MoM implants, blood levels of cobalt or chromium higher than 7 µg/L are often considered elevated and might suggest significant prosthesis wear or failure.
    • Extremely high levels, such as above 20 µg/L, are of significant concern and suggest acute wear or another serious issue with the implant.
  4. Symptoms and Risks of Elevated Metal Levels: Elevated cobalt and chromium levels can result in a variety of symptoms, both localized to the implant site and systemic:
    • Local symptoms might include pain, inflammation, pseudotumor formation, and tissue necrosis.
    • Systemic symptoms can be more diverse, including cognitive changes, heart issues, fatigue, thyroid problems, and hearing or vision disturbances. This collection of symptoms related to elevated cobalt levels has sometimes been referred to as “cobaltism.”
  5. Limitations: While blood tests can provide evidence of metal wear and potential implant issues, they are just one tool in the diagnostic process. Clinical symptoms, imaging studies (like MRI), and the patient’s history all play a role in diagnosing problems with a MoM implant.
  6. Follow-up and Treatment: If elevated metal levels are detected, the patient might undergo further testing, including imaging to visualize the implant and surrounding tissues. Depending on the findings, surgical intervention, including implant revision, might be necessary.

It’s important for patients with MoM implants to undergo regular medical check-ups, especially if they experience any symptoms indicative of potential implant problems. Regular blood monitoring can also be a proactive way to ensure early detection of elevated metal levels and related complications.

Hip Implant Lawsuits and Outcomes:

With the surfacing of these health issues, many patients filed lawsuits against the hip implant manufacturers. Some of the notable cases and their outcomes include:

DePuy Orthopaedics: A subsidiary of Johnson & Johnson, DePuy faced thousands of lawsuits after its ASR hip implants were recalled in 2010. The company settled many cases, allocating billions of dollars to affected patients.

DePuy Orthopaedics, a subsidiary of Johnson & Johnson, has faced extensive litigation due to complications associated with their ASR (Articular Surface Replacement) and Pinnacle hip models. Here’s an overview:

DePuy Orthopaedics: Lawsuits and Verdicts Involving ASR and Pinnacle Hip Models

1. The ASR Hip System:

  • Recall: In 2010, DePuy initiated a global recall of its ASR Hip Resurfacing System and ASR XL Acetabular System after data suggested a higher-than-expected failure rate for the devices. By that time, about 93,000 units had been implanted worldwide.
  • Lawsuits: Thousands of lawsuits were filed against DePuy, alleging defects in the design and manufacture of the ASR systems, causing early device failure and complications like metallosis.
  • Settlement: DePuy has entered into multiple settlement agreements to resolve the majority of these lawsuits. As of my last update in 2022, the company had allocated over $4 billion to settle claims.

2. The Pinnacle Hip System:

  • Concerns: The Pinnacle Hip System, specifically its metal-on-metal version using the Ultamet liner, faced scrutiny for problems similar to those of the ASR system. While the Pinnacle MoM hip was not recalled, it became the subject of significant litigation.
  • Lawsuits: Thousands of patients filed lawsuits claiming that the metal-on-metal version of the Pinnacle system was defectively designed and caused complications like metallosis, pseudotumors, and early implant failure.
  • Key Verdicts:
    • In 2016, a federal jury in Dallas awarded six Pinnacle hip plaintiffs more than $1 billion, though a judge later reduced the award to around $500 million.
    • In 2017, a different Dallas jury awarded over $1 billion to a group of six patients, which was subsequently reduced to $245 million.
  • Settlement: In 2018, DePuy and its parent company, Johnson & Johnson, agreed to settle nearly 10,000 Pinnacle-related lawsuits with a reported sum of around $400 million.

3. Conclusion: DePuy’s legal troubles with both the ASR and Pinnacle hip models underscore the critical importance of rigorous clinical testing and post-market surveillance for medical devices. The litigation saga also highlights the importance of patient advocacy in holding manufacturers accountable.

Stryker: Another major manufacturer, Stryker, recalled its Rejuvenate and ABG II hip stems in 2012, facing numerous lawsuits which they settled for over a billion dollars.

Stryker is another major manufacturer that faced extensive litigation due to complications with some of its hip implant products. Two of the company’s prominent problematic implants are the ABG II and the Rejuvenate Modular Hip Systems. Here’s a breakdown of the lawsuits and verdicts surrounding these devices:

Stryker: Lawsuits and Verdicts Involving ABG II and Rejuvenate Modular Hip Systems

1. Background on the Implants:

  • The ABG II and Rejuvenate Modular Hip Systems were designed to offer a more customized fit compared to traditional hip implants, using modular neck and stem components.
  • Both systems were promoted as offering better stability and range of motion.

2. Recall and Issues:

  • In 2012, Stryker voluntarily recalled its ABG II and Rejuvenate hip systems due to concerns over potential fretting and corrosion at the modular neck junction, which could lead to adverse local tissue reactions, as well as pain and swelling.
  • This fretting and corrosion could potentially lead to the release of metal ions into the patient’s body, causing metallosis and other complications similar to those seen with other metal-on-metal hip implants.

3. Lawsuits:

  • Thousands of patients filed lawsuits against Stryker, alleging that the Rejuvenate and ABG II systems were defectively designed, leading to premature failure, metal poisoning, pseudotumors, and the need for revision surgery.
  • Many of these lawsuits were consolidated into multidistrict litigation (MDL) in Minnesota federal court to facilitate the legal process.

4. Settlements:

  • 2014: Stryker settled an initial group of lawsuits for over $1 billion. This settlement covered patients who had revision surgery before a specified cut-off date in 2014.
  • 2016: The company announced another settlement to compensate additional plaintiffs who underwent revision surgery after the 2014 cut-off. While specific figures for this settlement weren’t initially disclosed, it was expected to cost Stryker several billion dollars when combined with the 2014 settlement.

5. Individual Verdicts:

  • While many cases were settled, some individual cases did proceed to trial. The outcomes varied with some verdicts in favor of the plaintiffs and others in favor of Stryker.

6. Conclusion: The Stryker ABG II and Rejuvenate hip system cases emphasize the potential risks associated with innovative medical devices. It showcases the challenges faced by manufacturers in predicting long-term outcomes of novel designs and the legal fallout when devices do not perform as intended.

Biomet: The M2a Magnum hip implants led to lawsuits due to complications. Settlements totaled hundreds of millions.

Biomet Orthopedics, similar to other major orthopedic device manufacturers, has also faced a significant amount of litigation related to its metal-on-metal (MoM) hip implant devices, notably the Magnum and M2a models. Here’s a detailed overview:

Biomet Orthopedics: Lawsuits and Verdicts Involving Magnum and Other Hip Models

1. Background on the Implants:

  • The Biomet M2a Magnum hip implants were designed as metal-on-metal devices. The construction was marketed with the promise of durability and longer-lasting performance, especially for younger and more active patients.

2. Issues with the Magnum and M2a Models:

  • Patients began reporting various complications similar to those seen with other MoM hip implants, such as pain, difficulty walking, loosening or dislocation of the device, and metallosis.
  • As with other MoM implants, the metal components of the Biomet devices can wear down and release metal ions into the body, leading to tissue damage and other adverse reactions.

3. Lawsuits:

  • Numerous patients filed lawsuits against Biomet, alleging that the M2a Magnum hip implants were defectively designed. Claims often revolved around premature failure of the device, the need for painful revision surgeries, and other complications such as metallosis.
  • Many of these cases were consolidated into multidistrict litigation (MDL) in the Northern District of Indiana.

4. Settlements and Verdicts:

  • 2014: Biomet agreed to a large-scale settlement to resolve many of the lawsuits linked to its M2a and Magnum hip implants. The preliminary agreement proposed a base award of $200,000 per plaintiff, although the actual amounts could vary based on individual factors (like the patient’s age, medical history, and number of revision surgeries). The total settlement fund was expected to exceed $50 million.
  • Subsequent Settlements: After the initial settlement, Biomet continued to face lawsuits and claims related to its hip implants. The company settled additional cases in subsequent years, although exact figures and terms were often confidential.

5. Ongoing Litigation and Conclusion:

  • While the 2014 settlement resolved a significant portion of the lawsuits, Biomet continues to face litigation related to its MoM hip implants. Each case’s outcome can vary based on its individual facts and circumstances.
  • The legal challenges surrounding Biomet’s Magnum and other hip models further highlight the broader issues with MoM hip implants. This saga underscores the importance of rigorous clinical testing and post-market surveillance to ensure patient safety.

Zimmer Holdings: The Durom Cup, manufactured by Zimmer, was temporarily taken off the market due to complications. Though not a formal recall, it led to lawsuits which the company resolved through settlements.

The Zimmer Durom Cup is another prominent case in the world of metal-on-metal (MoM) hip implants that faced significant controversy and litigation. Here’s an overview:

Zimmer Durom Cup: Lawsuits and Verdicts

1. Background on the Implant:

  • The Zimmer Durom Cup was introduced in the U.S. market around 2006. Unlike other hip replacement devices, the Durom Cup was a one-piece metal socket, intended to bond directly with the patient’s bone, eliminating the need for a plastic liner.
  • The device was marketed as a long-lasting solution suitable for younger, more active patients.

2. Issues with the Durom Cup:

  • Soon after its introduction, reports of complications began to emerge. Many patients experienced severe pain, difficulty walking, and other symptoms.
  • A key concern was that the Durom Cup was failing to bond correctly with the bone, leading it to come loose or shift position.

3. Suspension and FDA Notification:

  • In 2008, Zimmer temporarily suspended sales of the Durom Cup in the U.S. This was primarily due to concerns raised by orthopedic surgeons about the high rate of revisions needed with the implant.
  • The company also released an FDA notification indicating that surgeons may not have been fully trained on the proper surgical techniques required for the Durom Cup.

4. Lawsuits:

  • A significant number of patients filed lawsuits against Zimmer, alleging that the Durom Cup was defectively designed and manufactured, and that Zimmer failed to adequately warn the medical community and the public about the risks.
  • Many of these cases were consolidated into multidistrict litigation (MDL) in the District of New Jersey.

5. Settlements and Verdicts:

  • Zimmer faced a substantial financial toll from the Durom Cup lawsuits.
  • While exact figures for individual settlements were often confidential, by around 2016, Zimmer had reportedly allocated more than $300 million to resolve Durom Cup claims.
  • As with many mass torts, individual lawsuit outcomes varied. Some plaintiffs received verdicts in their favor, while others did not, and many chose to settle their claims outside of court.

6. Conclusion: The Zimmer Durom Cup saga serves as another cautionary tale in the realm of MoM hip implants. Despite the promise of innovative designs, the real-world performance of these devices can sometimes fall short, leading to patient suffering and significant legal and financial ramifications for the manufacturers.

These lawsuits claimed that the manufacturers were negligent in their design, testing, and marketing of MoM hips. Furthermore, they alleged that the companies failed to warn the medical community and the public about potential risks.

Smith & Nephew: This company faced challenges with its Birmingham Hip Resurfacing (BHR) system and its Total Hip model. Patients reported problems similar to other MoM devices, including premature device failure and metallosis. Subsequent lawsuits resulted in Smith & Nephew settling numerous claims, though the financial details remain confidential.

Smith & Nephew is yet another major orthopedic device manufacturer that faced legal challenges related to its metal-on-metal (MoM) hip implant products. The primary products in contention have been the Birmingham Hip Resurfacing (BHR) system and the various Total Hip Replacement systems. Here’s an overview:

Smith & Nephew Orthopedics: Lawsuits and Verdicts Involving BHR and Total Hip Models

1. Background on the Implants:

  • Birmingham Hip Resurfacing (BHR) System: The BHR was designed as an alternative to total hip replacement, especially for younger, more active patients. Rather than replacing the entire hip joint, the BHR system reshapes the head of the femur and caps it with a metal implant, working in conjunction with a metal cup in the hip socket.
  • Total Hip Models: Smith & Nephew has a range of total hip replacement systems. Some versions, particularly those with metal-on-metal designs, have come under scrutiny.

2. Issues with BHR and Total Hip Models:

  • Over time, concerns arose regarding premature wear, metallosis, and other complications like pseudotumors and hip implant failure.
  • Smith & Nephew issued several recalls and field safety notices for certain lots of its hip products, citing manufacturing issues or elevated revision rates.

3. Lawsuits:

  • Patients who experienced complications filed lawsuits against Smith & Nephew. Many alleged that the company’s MoM hip implants were defectively designed and that the company failed to provide adequate warnings about potential risks.
  • Some of these lawsuits were consolidated into multidistrict litigation (MDL) in the District of Maryland.

4. Settlements and Verdicts:

  • Smith & Nephew had not entered into any large-scale settlements like some of the other manufacturers. Instead, cases were often handled individually.
  • Some plaintiffs received favorable verdicts or settlements, while others did not. The outcomes of individual cases were dependent on the specific facts, circumstances, and available evidence in each situation.

5. Ongoing Litigation and Conclusion:

  • Lawsuits regarding Smith & Nephew’s hip products are ongoing, and the landscape of litigation continues to evolve.
  • The challenges faced by Smith & Nephew with its BHR and Total Hip models fit into a broader industry-wide issue regarding the safety, efficacy, and longevity of MoM hip implants.

The central claim in all of these artificial hip lawsuits was manufacturers’ negligence in design, testing, and marketing and their failure to adequately warn about risks.

The Impact on the Medical Device Industry

The wave of lawsuits had significant implications:

  • Stricter Regulations: Regulatory bodies like the U.S. Food and Drug Administration (FDA) tightened controls on MoM hips, requiring manufacturers to conduct post-market surveillance studies to understand the risks.
  • Reduced Popularity of MoM Hips: Due to the associated risks and negative publicity, the demand for MoM hip implants dropped drastically. Many surgeons reverted to using traditional hip implants.
  • Financial Impact: Aside from the huge settlements, manufacturers also faced declining sales and stock prices as their reputations suffered.

The saga served as a cautionary tale for the medical device industry, emphasizing the need for rigorous testing, transparent communication, and swift action when problems arise.


The metal-on-metal hip lawsuit wave underscored the complexities of medical device innovation. While aiming for progress, the medical community must ensure that safety remains paramount. As for patients, the events emphasize the importance of staying informed and understanding the potential risks of any medical procedure or device.

Contact Dr. Shezad Malik Law Firm
If you or a loved one had a Metal on Metal Hip Implant listed above and have suffered injuries or needed premature revision surgery with the device, contact the attorneys at Dr. Shezad Malik Law Firm to learn more about your legal rights. You can speak with one of our representatives by calling 214-390-3189, or by filling out the case evaluation form on this page.

Our law firm’s principal office is in Dallas and we have offices in Fort Worth, Texas. Dr Shezad Malik Law Firm represents clients in dangerous drug and dangerous medical device lawsuits nationwide.

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