After knee arthroscopy, many patients will experience quadriceps atrophy, resulting in long-term knee pain, a sense of instability, playing soft legs, and seriously affecting the efficacy of the surgery. Commonly used quadriceps exercise methods: 1, straight leg raise exercise lying flat, knee straight, ankle dorsal extension, elevate the patient, and the bed at 30 °, adhere to 10 seconds each time, 30 times each group, 6 groups per day. Can be respectively at 7:00 am, 9:00 am, 11:00 am, 5:00 pm, 7:00 pm, 9:00 pm (set your own time) for a group. 2, squatting against the wall stand with your legs, feet off the wall 10 centimeters, and separated from the shoulder width, back against the wall, double upper extremities forward, slowly squatting to 45 °. Insist on 10 seconds each time, 30 times per group, 6 groups per day. You can make a group at 7 am, 9 am, 11 am, 5 pm, 7 pm, 9 pm (set your own time). Generally, you can start straight leg raising exercises on the 1st day after surgery, and start squatting against the wall when the patient can bear weight.