Although Cauda Equina Syndrome is rare, it is somewhat known that it is sometimes caused by negligence, proving it is negligence is another story. As much as you feel and know there has been negligence, the other side will find as much good reason as possible to bring doubt and dispute to your claim. It's worth remembering that all the solicitors/lawyers involved will be emotionally detached and as objective as they can in view of the Law.
If you feel that you have a claim then the first thing you need to do, is get a journal, write everything down and date it. Write a statement of the events leading up to the incident and around the incident.
Ask those close to you to make notes in a journal, of their recollection of events at the time of the incident too. No matter how much you think you can remember at the time, you will begin to forget details as time passes and at the end of the day, if it comes down to a Court Case, it may end up your word against someone else's.
In the UK, you can request to see your doctor's/hospital records, I had my sent to me and it was very interesting to see the comments inside. I saw 2 doctors when developing CES and on each occasion they added 'no evidence of Cauda Equina '.
Journal and date any changes in you physically, mentally and emotionally and any changes of equipment that you use or medication you need.
One thing that I had to remind myself of, was that the health service ( in all countries too) have a responsibility to us and a duty. If they fail in that responsibility or duty and because of this an individual suffers a life long disability then the person should be paid damages, it's their right. After all, we put our trust in public services, we do not deserve to come away worse from their intervention or lack of it.
In the UK there is a 'No win no Fee' arrangement with most solicitors and clients which makes the claim at least financially possible, providing your case looks to have enough potential. The insurance company will support claims to sue that are within reach of success and this potential will be calculated throughout your claim to make sure it is still worth the risk as such.
You will have to check out the country that you live within in regards to the process.