Figure 2: Comparison of dressing change days between the two groups. The average days of postoperative dressing change days in the traditional dressing group were (25.91±3.427) days and the average days of postoperative dressing change days in pyogenic cavity aerobic therapy + negative pressure drainage were (3.692±0.208) days. (* P<0.05, **P<0.01,*** P<0.001)