An implantable electrode arrangement for a cochlear implant system comprising: an extracochlear electrode lead for carrying one or more cochlear stimulation signals, the electrode lead having a lead proximal end couplable to an implanted signal processor, and a lead distal end configured to enter an electrode opening in the outer surface of an implanted cochlea; an intracochlear electrode array for insertion into the implanted cochlea, the electrode array having: i an array proximal end connected to the lead distal end at the electrode opening, ii. an array distal end terminating within the implanted cochlea, and iii. an outer surface with a plurality of stimulation contacts for applying the cochlear stimulation signals to target neural tissue within the implanted cochlea; and at least one retraction limiter having an extracochlear portion located at the lead distal end and an intracochlear portion located at the array proximal end; wherein the intracochlear portion of the at least one retraction limiter is adapted for deformation away from an outer surface of the array proximal end after surgical insertion of the electrode array into the implanted cochlea so as to form an anti-retraction projection preventing post-surgical retraction of the array proximal end back through the electrode opening, characterized in that a distal end of the intracochlear portion of the at least one retraction limiter is fixedly attached to the outer surface of the array proximal end, and wherein the remainder of the intracochlear portion is separable from the outer surface of the array proximal end, whereby sliding of the extracochlear portion of the at least one retraction limiter over the lead distal end causes the separable part of the intracochlear portion to deform out away from the outer surface of the array proximal end to form the anti-retraction projection. an extracochlear electrode lead for carrying one or more cochlear stimulation signals, the electrode lead having a lead proximal end couplable to an implanted signal processor, and a lead distal end configured to enter an electrode opening in the outer surface of an implanted cochlea; an intracochlear electrode array for insertion into the implanted cochlea, the electrode array having: i an array proximal end connected to the lead distal end at the electrode opening, ii. an array distal end terminating within the implanted cochlea, and iii. an outer surface with a plurality of stimulation contacts for applying the cochlear stimulation signals to target neural tissue within the implanted cochlea; and i an array proximal end connected to the lead distal end at the electrode opening, ii. an array distal end terminating within the implanted cochlea, and iii. an outer surface with a plurality of stimulation contacts for applying the cochlear stimulation signals to target neural tissue within the implanted cochlea; and at least one retraction limiter having an extracochlear portion located at the lead distal end and an intracochlear portion located at the array proximal end; wherein the intracochlear portion of the at least one retraction limiter is adapted for deformation away from an outer surface of the array proximal end after surgical insertion of the electrode array into the implanted cochlea so as to form an anti-retraction projection preventing post-surgical retraction of the array proximal end back through the electrode opening, characterized in that a distal end of the intracochlear portion of the at least one retraction limiter is fixedly attached to the outer surface of the array proximal end, and wherein the remainder of the intracochlear portion is separable from the outer surface of the array proximal end, whereby sliding of the extracochlear portion of the at least one retraction limiter over the lead distal end causes the separable part of the intracochlear portion to deform out away from the outer surface of the array proximal end to form the anti-retraction projection.