Relative volume measured with magnetic resonance imaging is an articular collapse predictor in hematological pediatric patients with femoral head osteonecrosis

Figure 3 Two adjacent coronal T1-weighted images show the discrepancy between the two parameters (volume, A vs surface area, B) considered for the prediction of future joint deformity. Even if the overall necrotic lesion is rather big (A), there is only a minor involvement of the femoral head surface (B): In these cases RV performed better than RS in predicting femoral head deformity. RV: Relative volume; RS: Relative surface.