When running on the treadmill, the stress mode of the knee is unnatural, and at the same time, the user does not need to "actively do work" like running on the ground, so the treadmill not only burns fat less efficiently, but also suffers more serious injuries (the structure of the knee is very special, and the meniscus and patella are easy to wear and recover).

I suggest you slow down when using the treadmill and adopt a stride and rhythm similar to "race walking". If the damage is already serious, it is recommended to use an elliptical machine.