If the leg is 2 centimeters shorter after knee arthroscopy, it is considered to be related to excessive bone amputation, muscle atrophy, etc. Functional training or bone lengthening is needed according to the etiology. 1. Excessive bone amputation: If the leg is shortened by 2 centimeters due to the removal of diseased tissue by arthroscopic surgery, the patient will feel inconvenient to move around and will fall down easily when walking. The symptoms can be relieved by increasing the height of the bone, and bone lengthening can be used to relieve the symptoms if necessary. 2. Muscle atrophy: Some patients may experience muscle atrophy after knee surgery, which may lead to shorter or thinner legs. Symptoms can be improved through functional training, so that the joint function returns to normal, such as lying flat on the bed, legs straight, and then alternately elevated, can be practiced about 50 to 100 times a day. If you find that your legs are short after arthroscopic surgery, it is recommended that you consult a doctor who will choose the best treatment for your individual situation.