I also had ct scan and no red flags! I am so frustrated and was really hoping the fluid removal would solve my pain all these years. So Dr said it was good news/bad news- as there were no red flags. I know going through this is going to be a lot of work and pain - but if a revision will make my quality of life better- I need to do it. I just went through a terrible spinal surgery last year- fusion and laminectomy- and incision opened up 3 weeks post op and I was back in the hospital for a week with 2nd surgery and picc line and 3 weeks of infusion therapy in hospital post surgery. Recovery has taken a year. It’s not for the faint of heart. So I put knee issue on back burner until my spine is better. Now is the time for decisions . My surgeon said that’s the next step.