Evaluation of Intracochlear Trauma Caused by Insertion of Cochlear Implant Electrode Arrays through Different Quadrants of the Round Window
Table 1
Grade of intracochlear trauma caused by electrode array insertion through the anterosuperior or anteroinferior quadrant of the round window membrane in each segment.
Insertion
Total
Variable
Group 1 ()
Group 2 ()
)
%
%
%
Segment 1 (grade)
0.503
0
13
100
10
83.3
23
92.0
1
0
0
0
0
0
0
2
0
0
0
0
0
0
3
0
0
0
0
0
0
4
0
0
2
16.7
2
8.0
Segment 2 (grade)
0.538
0
10
76.9
8
66.7
18
72.0
1
1
7.7
0
0
1
4.0
2
1
7.7
1
8.3
2
8.0
3
1
7.7
1
8.3
2
8.0
4
0
0
2
16.7
2
8.0
Segment 3 (grade)
0.470
0
9
69.2
7
58.3
16
64.0
1
2
15.4
0
0
2
8.0
2
1
7.7
2
16.7
3
12.0
3
0
0
0
0
0
0
4
1
7.7
3
25.0
4
16.0
Segment 4 (grade)
0.894
0
11
84.6
10
83.3
21
84.0
1
1
7.7
0
0
1
4.0
2
0
0
0
0
0
0
3
1
7.7
1
8.3
2
8.0
4
0
0
1
8.3
1
4.0
Segment 5 (grade)
0.810
0
10
76.9
9
75.0
19
76.0
1
1
7.7
0
0
1
4.0
2
0
0
0
0
0
0
3
1
7.7
0
0
1
4.0
4
1
7.7
3
25.0
4
16.0
Lowest grade
0.406
0
9
69.2
7
58.3
16
64.0
1
1
7.7
0
0
1
4.0
2
1
7.7
0
0
1
4.0
3
1
7.7
0
0
1
4.0
4
1
7.7
5
41.7
6
24.0
Group 1: insertion through the anterosuperior quadrant of the round window membrane; group 2: insertion through the anteroinferior quadrant. = number of samples. Results of the Mann-Whitney test.
