Figure 4.

A. LOUPE image of the whole specimen (hematoxylin and eosin, ×1.25 magnification). Area “S” corresponds to the low intensity area on T1-weighted MRI. Area “M” corresponds to the lower intensity line on T1-weighted MRI. B. Photomicrograph of area “S” (hematoxylin and eosin, ×40 magnification). There is a fracture line (broken line) associated with a fracture callus (arrow) and bone marrow cell debris (arrowhead). Empty lacunae are observed distal to the fracture line (asterisk). C. Photomicrograph of area “M” (hematoxylin and eosin, ×40 magnification). Woven trabecular bone formation (arrow) is observed around the original fractured bone trabeculae at 5.0-7.0 mm from the articular cartilage. The bone marrow space is filled with fibrovascular tissue (asterisk).