Figure 2.

Comparison of stress substance levels. A. There was no significant difference in adrenalin levels between the two groups before operation. The adrenalin levels in the two groups 30 min after operation were higher than those before operation, and the adrenalin levels in the joint group were significantly lower than those in the control group. B. There was no significant difference in norepinephrine levels between the two groups before operation. The levels of norepinephrine in the two groups 30 min after operation were higher than those before operation, and the levels of norepinephrine in the joint group were significantly lower than those in the control group. *** indicates P < 0.001.