Necrosis depth
The depth of scar tissue produced by thermal injury is used as the standard for the necrosis depth during tonsillectomy. The mean necrosis depth in HS group was 767.5μm. In coblation group, the mean necrosis depth was 447.1μm. In CD group, there was a little inflammatory cell infiltration in the tonsil tissue without thermal injury, but the interstitial edema was severe, and small blood vessels were dilated(Figure 4). The necrosis depth was statistically different between three groups(p < 0.05)