Haematoxylin-eosin staining was applied to observe the pathological process of spinal fusion. Expression of bone morphogenetic protein-2(BMP_ 2 )was detected by immunohistochemistry.

• 对标本进行HE和免疫组织化学染色观察植骨融合的病理过程和骨形态发生蛋白2(BMP2)的表达。