BACKGROUND:Previous study has observed that the calf acellular dermal membrane exhibits slow repair efficiency, fast degradability speed and other shortcomings in the repair of cartilage defects. OBJECTIVE:To investigate the repair effect of the col agen type Ⅱ-modified acel ular dermal membrane on cartilage defects in rabbits. METHODS:The fetal rabbit chondrocytes were seeded onto the col agen type Ⅱ-modified acel ular dermal membrane, and the composite was then observed under scanning electron microscope at 3, 7 and 14 days. Cartilage defect models were established on the bilateral femoral condyles of 24 New Zealand white rabbits, and these model rabbits were randomly allocated to three groups. The cartilage-acellular dermal membrane and cartilage-collagen type Ⅱ-modified acellular dermal membrane were implanted into the defect regions of control and experimental groups, respectively. Those received no intervention were as blank control group. Collagen type Ⅱ immunohistochemical staining and Wakitani scoring system were performed at 6 and 12 weeks postoperatively. RESULTS AND CONCLUSION:Chondrocytes grew and adhered well in the scaffold. The Wakitani scores in the experimental group were significantly lower than those in the control and blank control groups at postoperative 6 and 12 weeks (P<0.05). At 6 and 12 weeks postoperatively, collagen type Ⅱ immunohistochemical staining was the strongest in the experimental group, with yellow and brown particles in the cytoplasm;the control group was positive for collagen type Ⅱ immunohistochemical staining, while the blank control group was negative for the staining. Our findings suggest that the collagen type Ⅱ-modified acellular dermal membrane is beneficial for the repair of cartilage defects.%背景:前期实验发现,以小牛皮为原料的脱细胞真皮基质胶原膜修复软骨缺损,存在修复时间长、降解速度快等不足.目的:观察Ⅱ型胶原修饰后脱细胞真皮基质胶原膜修复兔软骨缺损的效果.方法:将新西兰乳兔软骨细胞接种于Ⅱ型胶原修饰脱细胞真皮基质胶原膜上,接种3,7,14 d进行扫描电镜观察.在24只新西兰大白兔双侧膝关节股骨髁部制作软骨缺损模型,随机分3组,空白对照组不作任何处理,对照组缺损部位植入软骨细胞-脱细胞真皮基质胶原膜,实验组缺损部位植入软骨细胞-Ⅱ型胶原修饰脱细胞真皮基质胶原膜,术后6,12周进行组织学Wakitani评分及Ⅱ型胶原免疫组织化学染色.结果与结论:①细胞在支架材料的内部生长良好,贴附较佳;②实验组术后6,12周的组织学Wakitani评分均低于对照组、空白对照组(P<0.05);③术后6,12周,实验组Ⅱ型胶原免疫细胞化学染色阳性最强,可见棕黄色颗粒分布于细胞质内;对照组也可见Ⅱ型胶原免疫细胞化学染色阳性,空白对照组未着色;④结果表明,Ⅱ型胶原修饰脱细胞真皮基质胶原膜可促进软骨缺损的修复.
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