Assessment Of Bone Resorption In ONFH With MR Imaging

The aim of this study was to analyze the image characteristics of bone resorption lesion in Osteonecrosis of the femoral head (ONFH) on MR. 359 cases with ONFH staged as ARCO 2/3 were retrospectively analyzed, and 46 cases were included finally. General information, CT/MR signs of bone resorption, and bone marrow edema were evaluated and compared between two types of T2WI signal group. The sensitivity of MR in detecting bone resorption was 70.6%, and the specificity was 100%. The number, ADC value of bone resorption, BME, and the incidence of bone resorption connected to the subchondral fracture fissure were significantly greater in group 2 than 1. The intensity of bone resorption was significantly lower in group 2 than 1. MR performance good in detection of bone resorption. T2 Type I signal bone resorption lesions should be carefully detected to avoid missed diagnosis. T2 Type II signal bone resorption lesions may indicate destructive repair type.