Methods:
In all the cases, the exact reason behind theunsatisfactory primary
results and the surgical solution was noted. Intratympanic problems were
classified based on whetherthe failure was related to scar tissue
formation (periprosthetic adhesion, ossicular chain fixation)or any
other specific surgery-related complication (LPI necrosis, prosthesis
dislocation, ossicular luxation etc.). Fibrosis was considered as the
main reason if it was the only finding during surgery.
The average postoperative follow-up time was 147 days (SD 155.7; range
28-614), which could be considered as a reliable indicator of the
long-term results(6).
The AC levels were measured at 0.125; 0.25; 0.5; 1; 2;4; 8kHz, and the
BC were registered at 0.25; 0.5; 1; 2;4kHz. Evaluation was done
according to the Committee on Hearing and Equilibrium guidelines of the
American Academy of Otolaryngology Head and Neck Surgery (AAO-HNS) (1).
The thresholdswere reported, and the extended pure tone average was
calculated from 0.5; 1; 2; 3 kHz frequencies. The 3 kHz values were
considered as the mean of 2 and 4 kHz (7). The ABG was calculated from
same-time measurements. These data were retrospectively analyzed
statistically (IBM SPSS v. 25., Armonk, New York, USA) to define
descriptive data and the difference between types of surgical
failure.BootstrappedIndependent Samples t-test was used for analyzing
group differences, while intervention success was examined with Paired
Samples t-test. TOST test with the effect size of ’1’was used to
determine equivalence and non-inferiority(TIBCO Statistica). The
statistical significance level was p˂0.05.