Fig. 2From: Calcification of the acetabular labrum of the hip: prevalence in the general population and relation to hip articular cartilage and fibrocartilage degenerationa Representative digital contrast radiography (DCR) images (presented in original size and × 4 magnification (red boxes)) of the acetabular labrum (L = left, R = right) from one donor showing distinct cartilage calcification and the corresponding histological images in which cartilage calcifications (black) were confirmed histochemically by von Kossa staining. b DCR images (presented in original size and × 4 magnification (red boxes)) with increasing cartilage calcifications (from left to the right) of the acetabular labrum from different donors and the corresponding rising histological degeneration grade, which was evaluated by the Krenn score (0–3) on hematoxylin-eosin (HE) stainingBack to article page