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Inner ear energy exposure while drilling a cochleostomy.

CONCLUSION: Drilling a cochleostomy exposes the cochlea to acoustic and mechanical trauma, particularly during the final stage when the running burr is in contact with an intact membranous labyrinth that is then breached. To minimize cochlear damage we recommend avoidance of prolonged contact of the running burr with the membranous labyrinth. The promontory should be drilled until a thin eggshell of bone remains that can be removed with microinstruments, thus allowing the atraumatic opening of the membranous labyrinth with a sharp instrument. OBJECTIVES: To determine the energy transmitted to