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Study showed risk of revision in asymptomatic patients with MoM THA
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Despite a decrease in size for most cystic lesions in asymptomatic patients with modular metal-on-metal total hip arthroplasty implants, recently published results noted a risk of patients becoming symptomatic and requiring revision.
Researchers performed metal ion reports and metal artifact reduction sequence (MARS) MRI for 83 asymptomatic patients with modular metal-on-metal (MoM) total hip arthroplasty (THA) implants. Researchers reviewed and evaluated MARS MRIs for the presence of an adverse local tissue reaction lesion. At the time of MRI, researchers also measured and analyzed serum cobalt and chromium levels.
Overall, researchers identified cystic lesions in 31% of asymptomatic patients. Results showed researchers contacted all patients with positive MRIs to have repeat studies 1 year later, with 19 of 26 patients available for follow-up. Researchers performed revision in three patients who became symptomatic. Compared with three lesions that increased in size and one that remained the same size, according to results, patients with modular MoM THA implants that underwent repeat MARS MRI experienced a decrease in size for most adverse local tissue reaction lesions. Results showed serum cobalt and chromium ion levels were below the threshold of 7 ppb in all patients in the series. – by Casey Tingle
Disclosures: Goldstein is on the editorial or governing board for the Journal of Arthroplasty. Please see the full study for a list of all other authors’ relevant financial disclosures.
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