Longitudinal magnetic resonance imaging of pseudotumors following metal-on-metal total hip arthroplasty.
prospective_cohort · Level II
Where this comes from
- Record sourced from PubMed, PMID 24931436.
- Also identified by DOI 10.1016/j.arth.2014.05.006.
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Abstract
The purpose of the study was to determine the natural history of pseudotumors following metal-on-metal total hip arthroplasty (THA) using magnetic resonance imaging (MRI). Initial MRI was conducted at a mean of 36months postoperatively. Follow-up MRI was performed at a mean of 20months after the detection of 24 asymptomatic pseudotumors. Pseudotumor size was determined on MRI. The mean pseudotumor size changed from 729mm(2) to 877mm(2). Pseudotumors increased in size in eight and decreased in six. Ten hips showed no changes. The bigger the pseudotumor size, the more likely the size would increase. In conclusion, pseudotumors frequently change in size. A single MRI study in the clinical decision-making process should be avoided and a longitudinal study should be performed.
Medical subject headings
- Arthroplasty, Replacement, Hip
- Foreign-Body Reaction
- Hip Prosthesis
- Magnetic Resonance Imaging
- Metal-on-Metal Joint Prostheses
Anatomy
- hip