Neil,
It had been 3 years, I think, since the previous surgery. And before that I believe it had been like 5 years. Then 3 years before that. I am by no means certain of the cause though. The literature states that most guys never know the cause.
And about your legal case, yes, it does sound like there was negligence in there. I’m glad you are talking to an attorney! Sounds like you have more positive energy and hope now.
Good luck with everything!
Ken