What You Need-to-Know About Metal-on-Metal Hip Implant

For quite some time now, the orthopedic device production has come under heavy evaluation from both physicians and governing authorities over the manufacture of hip implants utilizing a design in which in metal parts rub against metal parts.

The study about the implants led to the discovery that chromium and cobalt ions from this kind of synthetic hip may seep into the adjacent tissue to impair muscle and bone, and set out to the lymph nodes, spleen, liver and kidneys, possibly causing harm. The research workers were also anxious the ions may affect one’s chromosomes, motivating genetic modifications.

Stryker Orthopaedics in their own free will, recalled two brands of its hip implant devices used in conjunction with unnatural hips in hip replacement surgeries, according to the website of the U.S. Food and Drug Administration.

There have been at least 45 adverse event reports from patients who say the devices caused pain and/or tissue swelling, and metal toxicity.

The examiners say makers of metal-on-metal hip implants modify the design of the hips over the years to improve flexibility, but those changes may be accountable for the discharge of high levels of toxins into the body.

Michigan-based Stryker, which runs its biotech division in Hopkinton, Mass., recalled Rejuvenate and ABG II modular-neck stems on July 2012 from the market, and cease global distribution. The company said the incidence of complications is extremely low, but people with these implants should make sure their primary care doctor knows they have one.

“While modular-neck stems provide surgeons with an option to correct certain aspects of a patient’s anatomy and hip biomechanics, given the potential risks associated with fretting and corrosion at the modular neck junction, Stryker Orthopaedics decided to take this voluntary action,” Stryker Vice President and General Manager of Hip Reconstruction Stuart Simpson said in a statement.

Simpson said the company would work with the medical community to better understand the complications with the devices as the company continues to assess the adverse event data. This includes at least 45 reports of injuries, using the Rejuvenate modular-neck stem, since the beginning of 2012, according to the FDA.

Recipients of metal-on-metal hip implants who are not suffering any of the side effects should still submit themselves to regular check-ups to their doctors.

If you are suffering a deteriorating effect three months or more after the hip replacement surgery, go to your surgeon right away for medical assistance.




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