It is literally impossible to undergo CI surgery or consent to CI surgery for someone else without being informed of the risks involved. No surgeon would proceed without informed consent and no hosptial would allow it. If any of you serioiusly contend that you suffered a known CI complication of which you were not informed prior to surgery, you should contact an attorney right now and sue the hospital for performing the procedure without informed consent.
I don't know how it is possible to undergo CI surgery without being aware that vertigo is a possible complication. I was informed of this at least five times, along with statistics on the frequency of the complication. Temporary vertigo is common. I experienced it. Permanent vertigo is rare. I decided to take the risk. I daresay that, if I were to claim my surgeon lacked informed consent to perform my CI surgery, I would quickly be provided with a copy of the written document I signed listing in excruciating detail every negative CI consequence anyone had ever heard of or imagined and acknowledging that I'd been so informed.
Any surgical procedure and, really, any life activity, whether it be CI surgery or crossing a busy street, involves assessment of the risk of a bad result. If humans restricted their activities to those with no risk at all then eating, drinking and breathing would all be prohibited.
If you want to put this in perspective, google "cochlear implant risks" and read some articles about it. Then google "child birth risks" and read about that. Pick some other surgical procedures and read about their risks. I think you will find that the risks of CI surgery are actually quite minimal compared to most surgical procedures. That doesn't mean the risks aren't real or that you won't be the unfortunate person who experiences a negative result. That's life. But it is really just not very honest to say that you didn't know the risks or that you weren't informed of the risks.
How important is it to you to be able to hear and to communicate orally with those people, the vast majority of people, who don't sign, don't understand deafness and have little or no experience with deafness? If it is not important to you, then there is no reason at all for you to run the risks of CI surgery. You will always have a place in the deaf community. Personally, as a late-deafened adult deep into a career that absolutely requires me to communicate orally, with a family depending on me to earn a living and support them, for me the CI decision was a no-brainer. I would, without hesitation, make the same decision for a child in my care who is too young to make the decision. If I were the deaf parent of a deaf child, I might very well make a different decision.