The difference in thickness between the two legs after minimally invasive meniscus surgery may be caused by edema and muscle atrophy. 1. Edema: minimally invasive meniscus surgery is a minimally invasive arthroscopic treatment for meniscus repair and molding or meniscus suture and meniscus removal. After the surgery, if the local blood circulation is poor, or the joint fluid leakage, etc. will cause limb edema, which will lead to the situation that the thickness of the two legs are not the same. 2. Muscle atrophy: The different thickness of legs after minimally invasive meniscus surgery may be caused by muscle atrophy due to prolonged inactivity after knee surgery. Muscle atrophy caused by reduced activity after surgery is usually a normal phenomenon, and can be restored after the limb is fully recovered by strengthening the functional exercise of the affected limb appropriately. When the thickness of two legs is not the same after meniscus minimally invasive surgery, it is necessary to go to the hospital in time for review, to clarify the cause of the disease, and to carry out functional exercises and treatment under the guidance of the doctor.