This is because the degeneration of cartilage in the human knee joint gradually starts after the age of 30. Therefore, daily protection of the knee joint should be carried out early: 1. Pay attention to keeping the knee joint warm and try to wear pants (for the elderly, you can also bring knee pads to keep warm on the one hand and prevent knee injuries on the other.) Do not expose the knee joint directly to cold air. 2. You can apply heat: to improve blood circulation and relieve knee discomfort to relieve knee pain and muscle spasm. Reduce swelling. Hot compresses with wet compresses are preferable. Such as hot air bath, hot spring bath, mineral bath, whirlpool bath. Hot towels can also be used as wet compresses, but note that heat therapy should be stopped if there is redness and swelling in the joint. Hypertension, heart disease, high summer temperatures need to pay more attention (stop hot compresses in the acute period). 3, to combine work and rest: avoid excessive weight on the joint, long time in a certain position, especially less than 90 °, do not sit and stand for a long time. Should be appropriate joint activities, such as more swimming, adhere to more cycling, less walking, especially less up and down the steps and walking uneven road. 4, obese people should moderate diet, reduce weight, more protein, vitamins and minerals food intake. 5, to have bad posture should be corrected as far as possible, the use of walking sticks, crutches, reduce the weight of the joint. 6.Rational use of braces: splint, knee brace, elastic adhesive band, increase the stability of the joint. 7.Strengthen the massage and massage around the joint: there are many methods, pushing, taking, rolling, rotating patella, rubbing patella, rolling patella. 8.Strengthen knee strength exercise: a: straight leg raise, b weighted straight leg raise, c short arc weighted straight leg raise with a pillow under the knee, d long arc weighted straight leg raise with a 90° bedside. 9, strengthen the knee joint range of motion training. a sitting bedside key limb under the affected limb, b lying hip and knee flexion, such as knee pain affects normal life when you have to go to the hospital for examination and treatment.