To what extent is it rideable Amex? Either on a crosser or even a MTB?

If not, I shall be walking... currently trying to decide if I am going to have my knee cut open on monday or if I am going to leave it as is... I can ride and race, it even survived 3 Peaks CX relatively unscathed, but I can't run... especially not downhill... There are no guarantees that I will be able to run afgter the op to tidy the cartilege, but the consultant thinks it will be as good as new again... Decisions decisions... I would quite like to have a cyclocross season this winter and not be laid up yet again for several months getting fat and unfit and having to regain fitness all over again at some point next year... grrrrrrrrrrrrrrrrrrr!