Introduction: This study investigates the correlation between insertion depth of CI622 lateral wall electrodes and auditory performance in postlingually deafened adults with cochlear implants (CI). A cohort of 120 CI patients was evaluated using preoperative and postoperative cone-beam computed tomography (CBCT) to assess cochlear length, electrode insertion depth, cochlear coverage, and insertion angle. Postoperative auditory performance was measured using the Freiburger Monosyllabic Speech Test in quiet at 65 dB SPL, the HSM Sentence Test at 10 dB SNR, and the adaptive Oldenburg Sentence Test in the S0N0 condition. The study aimed to determine whether specific electrode array positioning parameters were associated with improved auditory outcomes.

Method (OsiriX MD) :Tracing of LW in preop imaging, Tracing of CIin postop imaging, Reconstruction allows for computation of geometrical information: CDLLW, EID, CCL, CC, IA, …

Result: The study found a weak, non-significant correlation between deeper electrode insertion and improved speech comprehension, suggesting that while deeper insertion may offer some benefit, the electrode length was insufficient to achieve full cochlear coverage.

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