No. Arthroscopy is a technique for looking into a joint with a tube that contains an optic system for a camera and a light . It allows a surgeon to see and fix things in a joint 9commonly the knee or shoulder) without making a larger cut to do so. By "misctomy" i assume what you meant was "meniscectomy". That is to remove part or all of the knee's meniscus with can be done arthroscopically.
No. Arthroscopy is an orthopedic surgery where a small 'scope' w/ camera is placed into a joint to visualize structures and perform procedures(knee, shoulder , elbow , ankle, wrist, hip etc.)meniscectomy involves removing a torn piece of cartilage ( arthroscopically) from the knee joint. Meniscus='cushion' cartilage in knee . Hope this is clear!