Parker McDonald Analyzes Hip Implant Study That Found Long Term Pain For Patients With Recalled Metal-On-Metal Hip Implants

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Parker McDonald analyzes a study on the effects of metal-on-metal hip implants.

The hip implant lawyers at Parker McDonald, P.C.,analyzed a report recently released by The American Academy of Orthopaedic Surgeons (AAOS) that summarizes the findings of studies published in July of last year. These studies revealed metal-on-metal hip implant patients are having long-term problems associated with their implants.

According to the recent metal-on-metal hip implant study, patients with these implants, such as the DePuy ASR XL Acetabular Hip Replacement System that was recalled in 2010, may still encounter pain even after corrective surgeries and physical therapy. A subsidiary of Johnson & Johnson, DePuy Orthopaedics is the defendant in hundreds of defective hip implant lawsuits alleging the recalled hip implants caused considerable pain and debilitation.

Patients have experienced adverse reactions that include metallosis, impaired movement, tissue damage, bone loss, muscle inflammation, and tumors. Metallosis occurs from the metal components of a hip implant when they rub against each other, causing metal particles to break off and enter the blood stream and surrounding tissue. Movement becomes limited and the toxins threaten the heart and nervous system.

Among other findings, the AAOS summary provides information on:

  •     Studies comparing metal-on-metal Total Hip Arthroplasty (THA) to metal-on-polyethylene showed statistically significant increases in cobalt in the metal-on-metal groups. Cobalt levels ranged from 2.2-6.47 times greater in metal-on-metal groups versus metal-on-polyethylene groups.
  •     Studies comparing metal-on-metal THA/hip resurfacing to a hip system without a metal component (i.e., ceramic-on-polyethylene, ceramic-on-ceramic) showed statistically significant differences in cobalt concentrations in each instance.Metal-on-metal groups had cobalt levels 1.66-5 times greater than non-metal hip systems.
  •     Metal-on-metal hip resurfacing compared to ceramic-on-ceramic THA showed statistically significant increases in chromium. Levels in hip resurfacing patients were 1.88-3.13 times greater than ceramic-on-ceramic.
  •     In the metal-on-metal group, patients with pseudotumors had cobalt levels 4.84 times higher and chromium levels 5.71 times higher than metal-on-metal patients without pseudotumors.
  •     Hip joint aspirate was collected from patients with metal-on-metal THA. Significant differences were seen between the two groups with cobalt and chromium levels 13.7 and 7.69 times higher, respectively, in the group with pseudotumors.

To correct these issues, thousands of patients have required painful revision surgery to replace the faulty implant with a new model. Even after surgery, weeks of physical therapy are needed.

As hip implant recall attorneys,Parker McDonald continues to track and analyze news about these potentially harmful products. It is imperative that patients who received a metal-on-metal implant seek the advice of their physician to determine if they are at risk. With ongoing litigation against DePuy Orthopaedics, those who have experienced difficulties may be entitled to compensation. For more information on the DePuy hip implant recall visit or call 800-990-4884.

About Parker McDonald

Parker McDonald, P.C. offers comprehensive legal services for clients whose personal, business or property rights have been adversely affected. Built on years of trial experience, Parker McDonald lawyers are dedicated to a tradition of personal service and timely delivery of outstanding results. Parker McDonald has offices in Bedford, Fort Worth, Houston, Austin, and San Antonio.


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Erin McDonald
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