Case Report

Rapid Destruction of the Humeral Head Caused by Subchondral Insufficiency Fracture: A Report of Two Cases

Figure 5

Histologic features of the excised humeral head in patient 2 (hematoxylin-eosin staining). (a) A coronal section of the humeral head exhibits the collapse of the subchondral area and articular cartilage defects (×1.25). (b) The bone trabeculae are mostly vital but focally necrotic. New bone formation is seen around the necrotic bone trabeculae (×100).