Prognostic factors in ossiculoplasty: a statistical staging system

Area of Science:

• Otolaryngology
• Audiology
• Biomedical Engineering

Background:

• Ossiculoplasty is a surgical procedure to restore hearing by reconstructing the middle ear ossicles.
• Standard prosthesis systems, such as partial and total ossicular replacement prostheses (PORP and TORP), are commonly used.
• Predicting hearing outcomes after ossiculoplasty is crucial for patient management and surgical planning.

Purpose of the Study:

• To identify factors that predict hearing results following ossiculoplasty using the Dornhoffer HAPEX prosthesis system.
• To evaluate the impact of various surgical and patient-related factors on hearing outcomes.
• To assess the predictive capability of a revised staging system for ossiculoplasty outcomes.

Main Methods:

• Retrospective chart review of 185 patients (200 ears) who underwent ossiculoplasty with PORP or TORP prostheses.
• Hearing results were measured using the four-frequency pure-tone average air-bone gap (PTA-ABG).
• Multivariate statistical analysis was employed to determine the influence of mucosal status, ossicular chain status, and surgical techniques on hearing.

Main Results:

• No statistically significant difference in PTA-ABG was observed between PORPs and TORPs.
• The presence of the malleus handle was associated with significantly better hearing outcomes (11.6 dB ABG) compared to its absence (16.9 dB ABG).
• Factors negatively impacting hearing included mucosal fibrosis, drainage, revision surgery, and specific surgical procedures.

Conclusions:

• The presence of the malleus handle is a significant positive predictor of hearing outcome after ossiculoplasty.
• Mucosal status, surgical complexity, and prior interventions negatively affect hearing results.
• The Ossiculoplasty Outcome Parameter Staging Index demonstrates improved predictive accuracy for hearing outcomes in ossiculoplasty.