Hi
An Arthroscopy of the knee is a minor procedure although, of course, it does require an anaesthetic. Can be used to just have a look, do a washout, remove pieces of torn cartilage of repair ligament damage. Usually done as a day case and recovery is very quick. If you are fit well and healthy it should give minimal problems. You should be able to be back in work very quickly and back doing your hobbies, especially the cycling, within a couple of weeks if not sooner, as this in itself is a good partial weight-bearing exercise. Yes the sites on the internet state a 6 week rehab period, but this is until full recovery and you should be able to increase your activities during this period and, depending on the Therapy that you give, should be back in work after a week. The tissues that have been damaged in order to insert the arthroscopic instruments will take 6 weeks to heal, all healing takes this length of time, but the damage is mimimal as the insruments are so small.
If you watch Strictly Come Dancing, BBC in UK, Phil Tuffnell had an arthroscopic procedure to remove torn cartilage, on a Tues I think, and was back on the dance floor in a couple of days. Maybe not totally ideal but obviously doable.
I would cut out the MRI and just go for it. If the cartilage is torn it is unlikely to heal itself. It can sometimes be repaired, but this option lessens the older we get and the rehab period would be longer. It will probably worsen if left.
I have not had this myself but as a Physio have treated them, but these days we actually see very few Menisectomies, only those where there has been a problem. 99.9% of people are able to get on with it themselves after having been given advise before discharge. Before the days of arthroscopies this was a major procedure, very painful and needing loads of rehab over 8 to 12 weeks.
Do not be too concerned but good luck anyway.
Gill