ROI 1–7 (regions of interest). The seven regions of interest for the evaluation of the bone mineral density are shown. For description of the bone mineral density changes on the medial side, ROI 1–3 were combined to one medial value ROImed. On the lateral side, ROI 5–7 were combined to one lateral value ROIlat. All seven regions of interest were finally combined in one overall value, ROIall.