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.