1.Methods: Subchondral drilling to create the chondral defect on articular cartilage were performed on 9 goats (9 joints) by arthroscope.

• 方法：关节镜下对9只山羊（9膝）进行关节面钻孔术，造成软骨缺损模型，对其缺损位置进行准确定位。