Diagnostic value of MRI measurement in ischiofemoral impingement syndrome / 中国医学影像技术

ABSTRACT

Objective To investigate the diagnostic value of MRI in patients with ischiofemoral impingement syndrome (IFIS). Methods MRI data of 70 patients with IFIS (IFIS group) and 40 normal volunteers (control group) were analyzed retrospectively. The width of ischial femoral space (IFS) and quadratus femoris space (QFS) were measured on axial fat suppression T2WI, while the angle of sciatic bone was measured on axial T1WI, and the femoral neck shaft angle was measured on coronal T2WI, and then were compared between the two groups. The correlation between the width of IFS and the other three parameters was analyzed, and ROC curve was drawn to evaluate the diagnostic efficacy for IFIS. The degree of edema and fat infiltration of the quadratus femoris in IFIS group were evaluated, and the differences of IFS width among different grades were compared. Results In IFIS group, the IFS width, QFS width, ischium angle and femoral neck shaft angle was (11.76±2.22)mm, (8.33±2.20)mm, (132.59±1.39)° and 132.70(131.18,134.13)°, respectively, and the differences between the two groups were statistically significant (all P<0.001). The area under ROC curve in diagnosis of IFIS with IFS width, QFS width, ischium angle and femoral neck shaft angle was 1.000, 0.999, 0.996 and 0.975, respectively (all P<0.001). There was positive correlation between IFS width and QFS (r=0.743, P<0.001), negative correlation between IFS width and ischium angle and femoral neck shaft angle (r=-0.273, P=0.022; r=-0.332, P=0.005). The overall differences in IFS width among different grades of femoral quadratus edema and fat infiltration in IFIS patients were statistically significant (both P<0.05). Conclusion IFS and QFS of IFIS patients are obviously narrow. Edema and fat infiltration of quadratus femoris are common MRI findings in IFIS patients.