There is provided a cochlear implant system, comprising a microphone arrangement (20) for providing an input audio signal； a sound processor (24) for generating an auditory nerve stimulation signal from the input audio signal； an implantable stimulation assembly (12) comprising an electrode array (19) to be implanted into a cochlea of a patient for electrical stimulation of the cochlea according to the neural stimulation signal； and an electrode migration monitoring unit (54) including a unit (58), for capturing ECAP signals induced at the electrodes (18) of the electrode array in response to stimulation of the cochlea by applying auditory nerve stimulation signals to the electrodes, a memory unit (60) for storing captured ECAP signals and/or ECAP data derived from such captured ECAP signals, an electrode migration detection unit (62) for detecting electrode migration relative to the cochlea, by comparing presently captured ECAP signals and/or ECAP data derived from such presently captured ECAP signals to stored previously captured ECAP signals and/or ECAP data derived from such previously captured ECAP signals, and a unit (64) for outputting an alarm signal in case that electrode migration is detected by the electrode migration detection unit, wherein the electrode migration monitoring unit is adapted to repeat said capturing of ECAP signals and said comparing of ECAP signals and/or ECAP data on a regular basis.L'invention concerne un système d'implant cochléaire, comprenant un agencement de microphone (20) pour fournir un signal audio d'entrée ； un processeur de son (24) pour générer un signal de stimulation de nerf auditif à partir du signal audio d'entrée ； un ensemble de stimulation implantable (12) comprenant un réseau d'électrodes (19) à implanter dans une cochlée d'un patient pour la stimulation électrique de la cochlée selon le signal de stimulation neurale ； et une unité de surveillance de migration d'électrode (54) comprenant une unité (58) pour capturer
