Sandi, I don't know if I can be of much help, but as there are no other replies I thought I might as well answer your question! I had a Baker's Cyst which was a bit uncomfortable but didn't prevent me from running. I went for a scan (not an MRI) privately at my physio's suggestion after he diagnosed it, When I got there, I was told that the cyst had already ruptured, so no further treatment was needed. I do wonder if running on it actually helped rupture it... Yours case sounds worse than mine though. Let me know how you get on.
The Royal Parks Half Marathon is one of those which isn't registered - or it wasn't when I did it last year. It seems odd for such a major event but it's always over-subscribed and I suppose a lot of the entrants aren't too bothered. I only found out because I ran a PB and it would have been nice to have it included in the rankings.
I saw a consultant the other day about an arthroscopy and he told me it would take six to eight weeks to return to running or cycling. He said it would more likely be eight for the average person, six for elites who have more facilities to help them recover.
Interesting thread. I also have a meniscal tear and it is good to hear of other experiences. Mine doesn't really affect my running (I have done two marathons on it) just things requiring deep flexion such as kneeling and squatting and it also hurts at night sometimes.
The surgeon I saw recently after an MRI said that I could opt for an arthroscopy but that if it was his knee, he would leave it. At the moment I am still thinking about it... He also told me that the op would mean at least 8 weeks before I could start running again. As I am just coming back after injury (unrelated) that would be really frustrating and is one thing that is putting me off!
His opinion was that physio would not be of any use in trying to increase range of movement.