I have had arthroscopic surgery for a meniscus tear which sounds from your description to be the same.I had general anesthesia then the surgeon inserted a small camera into the knee joint. He then inflated the knee with water pressure and flushed out the debris, another incision was made to insert a shaving device that trimed the edges of the tear. Everything was flushed again and a slow release pain block inserted. The incisions were closed with one suture each and then the knee bandaged up. Depending on how you recover from the anesthesia you can usually go home the same day. I was on crutches for four days, walking normally and painfree after a week, but told no sport or long walks for 4/6 weeks.The waiting list for this op at the time I had it was 9 months(but I live in Wales and the lists are longer than England) so I paid �1,500 and had it done privately.Not the best of things to have given that you are a postman, I hope all goes well for you.