December 29, 2014
1 min read

Study data show frequent change in size for pseudotumors after THA

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Pseudotumors frequently changed in size among asymptomatic patients who underwent total hip arthroplasty, according to study results.

Researchers screened for pseudotumors using MRI after large-diameter, metal-on-metal total hip arthroplasty (THA) in 188 patients. The researchers performed MRI at a mean of 36 months postoperatively and follow-up MRI at a mean of 20 months after the detection of 24 asymptomatic pseudotumors in 20 patients, evaluating changes in pseudotumor size and serum metal ion levels.

Results showed a change in pseudotumor size from 729 mm2 to 877 mm2. The researchers found pseudotumors increased in size in eight hips, decreased in size in six hips and showed no changes in size in 10 hips.

According to study results, cystic pseudotumors either remained the same size or decreased, whereas mixed-type pseudotumors increased in size. However, this trend was not statistically significant due to small numbers included in the study, according to the researchers.

The researchers also found that, compared with smaller pseudotumors, pseudotumors that were initially larger were more likely to increase in size.

Disclosure: The authors have no relevant financial disclosures.