Frequent bending and straightening of a sprained knee is not conducive to recovery. After a knee sprain, you should minimize your activities and resume normal activities after your condition recovers. After a knee sprain, frequent bending and straightening activities within a short period of time will stimulate the muscles, bones, nerves and other tissues around the knee joint, which may aggravate the original pain, edema and other symptoms, which is not conducive to the recovery of the condition, and may even produce complications such as knee ligament rupture, tendon injury, joint dislocation and other complications. After knee sprain, you need to take sufficient rest. If you want to carry out necessary activities, such as walking, it is recommended to use crutches and other aids to reduce the burden on the knee joint and go to the hospital to be examined and treated by a professional doctor.