Objective: To explore whether the slice encoding for metal artifact correction(SEMAC) could improve the reliability of MRI in detecting aseptic loosening after total hip replacement(THR), we validated the diagnostic efficacy of SEMAC-MRI for aseptic loosening using surgical findings as the gold standard and compared it with CT and X-ray.Methods: The clinical data of 47 patients with suspected prosthetic loosening after THR admitted to our hospital from May 2019 to May 2021 were analyzed retrospectively, and their imaging findings were compared, including MRI, CT, and X-ray. Finally, receiver operating characteristic(ROC) curve was applied to analyze the diagnostic efficacy of different imaging methods in aseptic loosening of hip prosthesis.Results: SEMAC-MRI had a good imaging effect in the acetabular I area andfemur area 1 and 7, which could better judge prosthesis loosening in this area. The ROC curve showed that SEMAC-MRI had better diagnostic value for aseptic loosening of the acetabular and femoral prosthesis, with an AUC of 0.836 and 0.955, respectively. Meanwhile, the accuracy and sensitivity of SEMAC-MRI in predicting aseptic loosening of the prosthesis was significantly higher than that of X-ray(P<0.05).Conclusion: SEMAC-MRI has high sensitivity and accuracy in the diagnosis of prosthetic loosening after THR, which is helpful to detect early aseptic loosening, thus avoiding further aggravation of periprosthetic osteolysis. Therefore, the SEMAC-MRI technique is worthy of further clinical application. |
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