I've been diagnosed a mild medial meniscopathy and i'll be practised an arthroscopy. what exercises would you recommend me in the meantime?

Low impact: I would recommend low impact exercise including quad and hamstring strengthening. Avoid deep knee bending and a twisting or turning. Ice your knee after exercise.

Painfree exercises: Meniscal tears cause knee pain on certain activities depending on where the tear is. A painfree exercise is undertaken to prevent further weakening of the muscles around the knee. This will speed up your recovery. Often a certain range of motion arc will be painful and another not. Isometric exercises like straight leg raising tone muscles without the bending that can cause pain.