MAIN OUTCOME MEASURES: The fiber changing features, cell counting and blood vessel density in the ACLs were observed through MASSON staining and haematoxylin-eosin staining.

• 主要观察指标：MASSON染色、苏木精-伊红染色观察前交叉韧带内部纤维的变化特点、细胞计数及血管密度。