Dr. Sutphen and colleagues from Columbus, OH conducted a retrospective study with patients who had been implanted with the metal-on-metal Zimmer Durom hip implant. They were trying to quantify the prevalence of pseudotumors in patients who underwent metal-on-metal total hip arthroplasties. The study included only patients who required a total hip replacement due to osteoarthritis and subsequently consented to cobalt and chromium testing and MARS-MRI evaluation at their 3 year follow-up appointment. The authors classified patients as either symptomatic (hip pain with activity) or asymptomatic (no hip pain with activity). Their findings showed that clinical symptoms, such as metal ion levels and pain may not always correlate with the presence of a pseudotumor and that an increasing number of asymptomatic patients develop them as well. They felt that the use of standard follow-up evaluations (x-rays and clinical exam) underestimated the incidence of pseudotumors in an asymptomatic patient.
The law firm of Weisman, Kennedy & Berris is currently handling metal-on-metal cases involving the DePuy ASR hip implant. If you or someone you know, has been implanted with a DePuy ASR or Stryker Rejuvenate or ABG II hip implant please contact our office.
Cite Sutphen, S.A. et al. (2015). Prevalence of pseudotumors in patients after metal-on-metal hip arthroplasty evaluated with metal ion analysis and MARS-MRI, Journal of Arthroplasty, Epub