Abstract
Background
Adverse local tissue reactions (ALTR) around metal-on-metal (MOM) hip arthroplasties are increasingly being recognized as a cause of failure. These reactions may be associated with intraoperative tissue damage and complication rates as high as 50% after revision. Although MRI can identify ALTR in MOM hips, it is unclear whether the MRI findings predict those at revision surgery.
Questions/purposes
We therefore (1) identified which MRI characteristics correlated with histologically confirmed ALTR (using the aseptic lymphocytic vasculitis-associated lesions [ALVAL] score) and intraoperative tissue damage and (2) developed a predictive model using modified MRI to detect ALVAL and quantify intraoperative tissue damage.
Methods
We retrospectively reviewed 68 patients with failed MOM hip arthroplasties who underwent preoperative MRI and subsequent revision surgery. Images were analyzed to determine synovial volume, osteolysis, and synovial thickness. The ALVAL score was used to grade tissue samples, thus identifying a subset of patients with ALTR. Intraoperative tissue damage was graded using a four-point scale. Random forest analysis determined the sensitivity and specificity of MRI characteristics in detecting ALVAL (score ≥ 5) and intraoperative tissue damage.
Results
Maximal synovial thicknesses and synovial volumes as determined on MRI correlated with the ALVAL score and were higher in cases of severe intraoperative tissue damage. Our MRI predictive model showed sensitivity and specificity of 94% and 87%, respectively, for detecting ALVAL and 90% and 86%, respectively, for quantifying intraoperative tissue damage.
Conclusions
MRI is sensitive and specific in detecting ALVAL and tissue damage in patients with MOM hip implants. MRI can be used as a screening tool to guide surgeons toward timely revision surgery.
Level of Evidence
Level III, diagnostic study. See Guidelines for Authors for a complete description of levels of evidence.
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Acknowldgments
We thank Alissa Burge MD for assistance with the MRI analysis, Matthew Koff PhD for help with the statistical analysis, and Giorgio Perino MD for grading the histologic samples.
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The institution of one or more of the authors (HGP) has received, during the study period, funding from General Electric Healthcare (Waukesha, WI, USA). One of the authors certifies that he (DEP), or a member of his or her immediate family, has or may receive payments or benefits, during the study period, an amount less than $10,000 from Stryker (Mahwah, NJ, USA), and an amount of $10,000–$100,000 from Mako (Fort Lauderdale, FL, USA).
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This work was performed at Hospital for Special Surgery, New York, NY, USA.
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Nawabi, D.H., Gold, S., Lyman, S. et al. MRI Predicts ALVAL and Tissue Damage in Metal-on-Metal Hip Arthroplasty. Clin Orthop Relat Res 472, 471–481 (2014). https://doi.org/10.1007/s11999-013-2788-y
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DOI: https://doi.org/10.1007/s11999-013-2788-y