Abstract
This is a review of the causes of failure in 5½ years of personal experience with TORPs and PORPs. Prosthesis extrusion, the cause of failure in less than 5% of 446 TORP and PORP operations, usually was the result of a mucous membrane or eustachian tube problem. Severe sensorineural hearing impairment occurred in less than 1%, and these were operations in which the oval window was opened. Unsatisfactory hearing was the cause of failure in 18%.

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