After meniscus arthroscopy surgery, running is not recommended for a short period of time, and running can be resumed gradually 3~6 months after surgery. If the meniscus arthroscopy surgery has been done, running after the surgery will increase the load on the knee joint, and with the running exercise, the meniscus inside the knee joint will be under constant pressure, extrusion, friction, etc., which will easily lead to the secondary injury of the meniscus. Therefore, running is not recommended for a short period of time when you are recovering from meniscus arthroscopy. If the recovery after meniscus arthroscopy is smooth, you can start to gradually increase the activity level after the surgery, and carry out the functional exercise of the knee joint under the guidance of professional doctors. It is better to start running 3~6 months after the surgery, so as not to affect the normal recovery of knee joint function. How long can you run after meniscus arthroscopy needs to be combined with the recovery of the knee joint and the professional doctor’s advice.