X-ray of hip replacement implants
Privacy & Technology Print

Manufacturing Problems Could Mean Revision Surgery for Recent Hip Replacement Patients

The Scoop


If you've had a hip replaced since 2006, you may be at greater risk of device failure than a patient who was treated in previous years according to a study by U.K. researchers who examined the long-term performance of the DuPuy Pinnacle metal on metal (MoM) hip prostheses — the most commonly used metal hip implant in the world.


The device failures, which may be due to manufacturing issues, could mean you’ll need corrective surgery. This type of surgery is called a revision.


Findings


  • A failure rate of more than 16% is “unacceptably high.”
  • Metal hip replacements implanted since 2006 are more prone to failure.
  • Bilateral prostheses that replace both hip joints, those implanted into female patients, and devices implanted recently were found to be at greater risk.


The Details


A total of 434 patients (243 females and 191 males) implanted with the DePuy Pinnacle MoM hip prostheses were studied over a period of nearly eight years. Of the 489 hips implanted into the patients, 71 had to be replaced.


According to researchers, manufacturing issues may be the cause of the higher risk of failure and need for revision. A significant number of the parts removed during revision surgery were found to be manufactured with bearing diameters that did not conform to the design specification.


The researchers concluded their findings highlight the importance of previously unrecognized variations in device production.