In 2013, a paper published in Clinical Orthopaedics and Related Research titled “The natural history of inflammatory pseudotumors in asymptomatic patients after metal-on-metal hip arthroplasty.” by SA Almousa et al. provides background for itself, stating in part “Although pseudotumors have been reported in 32% of asymptomatic metal-on-metal hips, the natural history of asymptomatic pseudotumors is unknown.”  As such, the stated purpose of this study was “to assess changes over time in asymptomatic pseudotumors and the effect of revision on pseudotumor mass.”

“After the detection of 15 pseudotumors and five isolated fluid collections in a cohort of 20 asymptomatic patients (13 metal-on-metal, three metal-on-polyethylene, and four hip resurfacings)”, ultrasound was used at an average of about two years follow-up to monitor the growth of the pseudotumors.

Results showed that “Among the 15 nonrevised patients, pseudotumors increased in size in six (four solid and two cystic) of 10 patients, three of which had clinically important increases”.  Three pseudotumors “disappeared completely”, some others reduced in size.  “All revision patients had a reduction of chromium … and cobalt ions … Of five isolated fluid collections, four completely disappeared (two metal-on-metal and two metal-on-polyethylene) and one (metal-on-metal) increased from 26 cm(3) to 136 cm(3).”  That is, once metal-on-metal hips were replaced, metal ion levels were reduced.

Sadly, elevated metal ion levels and associated pseudotumors were not adequately warned for by DePuy Orthopaedics, the manufacturer of the recalled ASR and ASR XL hip replacement systems.  As a result, a number of DePuy ASR hip replacement lawsuits have been filed.  If you or a loved one has used a DePuy ASR hip replacement and suffered these or other complications as a result, including premature device failure, you too may be entitled to significant financial compensation.

For a free, no-obligation case consultation, contact our team of DePuy ASR lawyers at the information provided below.  We have the skills, resources, and experience required to win the compensation you deserve.

(855)  452 – 5529

Our DePuy ASR™ / ASR™ XL Hip Replacement Lawsuit Information page is a great place to start if you have any questions about DePuy ASR metal-on-metal hip replacements.