Conclusions PDGF-BB could activate the aging articular chondrocytes, promote their mitosis, proliferation and new cartilage formation.And the osteoblasts of the subchondral bone formed new bone.

• 结 论 PDGF-BB激活老年性退变软骨的细胞活性，使软骨细胞分裂、增殖加速，新软骨生成。