Research Article

Local Tensile Stress in the Development of Posttraumatic Osteoarthritis

Figure 4

The mRNA expression levels of COL1A1, COL2A1, Acan, and SOX9 (). P < 0.05, P < 0.01, and P < 0.001 compared with the control group. #P < 0.05, ##P < 0.01, and ###P < 0.001 in the indicated groups.