Fig. 4From: Heterotopic ossification in the post cruciate ligament of the knee: a case report and literature reviewHistopathologic evidence of heterotopic ossification (hematoxylin and eosin, original magnification× 200). a, b Bone staining clearly red (blue arrow). c Cartilage staining light blue (red arrow) and bone (blue arrow). d Chondroblasts proliferatingBack to article page