Compared between the two groups , the VAS 4 h , 6 h , 12 h , 24 h and 48 h after surgery in the observation group was lower than that in the control group ( all P < 0.05 ) ; the use frequency of analgesics in the observation group was lower than that in the control group ( P < 0.05 ) ; the abnormality rate of blood supply in the observation group was lower than that in the control group ( P < 0.05 ) .