Knee stiffness needs to have osteoarthritis, synovitis, joint adhesion, can take physical therapy, medication, surgical treatment recovery. 1. Osteoarthritis: joint stiffness can be performed quadriceps exercise and push patella exercise to increase joint flexibility, joint cavity injection of sodium vitrate has nutritional cartilage, lubrication of joints. Oral glucosamine sulfate capsules. 2. Synovitis: If the joint stiffness is caused by obvious swelling of the joint, a sterile syringe can be used to draw out the joint fluid. Ultrasonic physiotherapy or infrared physiotherapy should be performed, and synovitis granules should be taken orally. 3. Joint adhesion: If the stiffness is caused by prolonged postoperative braking after lower limb fracture, wax therapy and manual release of joint adhesion can be performed to improve the mobility of the joint. If the treatment effect is not obvious, surgery can also be performed to release. Knee stiffness needs to go to the hospital to identify the cause of the stiffness, and then treat the cause of the stiffness. The use of medication should be in accordance with the doctor’s instructions.