Evaluation of Intracochlear Trauma Caused by Insertion of Cochlear Implant Electrode Arrays through Different Quadrants of the Round Window

Figure 7

(a) Electrode array in the scala tympani causing slight elevation of the basilar membrane (grade 1). (b) Identification of a ruptured basilar membrane (grade 2). (c) Dislocation of the electrode array from the scala tympani to the scala vestibuli (grade 3). (d) Identification of a fracture in the osseous spiral lamina (grade 4).

(a)

(b)

(c)

(d)