Grade

Preoperatively

Postoperatively

P value

0

0 (0%)

0 (0%)

P < 0.001

I

4 (16%)

0 (0%)

II

12 (48%)

1 (4%)

III

9 (36%)

6 (24%)

IV

0 (0%)

13 (52%)

V

0 (0%)

5 (20%)

VI

0 (0%)

0 (0%)