Reasonable and moderate functional activities should be carried out under the guidance of a doctor, not the more activities the better. Generally speaking, walking bends, walking flat roads, as long as you do not feel tired and strained and painful are all OK, but climbing, ascending, squatting and standing up are not advocated, and the number of stair climbing should be minimized, especially during the onset of osteoarthrosis. Quadriceps contraction exercises can be done to enhance the stability of the joint. Method: In the straight knee, do rhythmic active contraction of the thigh muscles, commonly known as “tensing”. Can also do the lower limb straight position elevated 30 degrees and maintain 1 minute of activity, as a time, rest a moment to do the second time, 10 times for a group, do 2 to 3 groups per day. If the strength of the lower limbs has been enhanced, a 500g or 1kg sandbag can be tied to each lower leg for exercise. At the same time, the elderly should pay attention to the warmth of the joints, because cold will induce or aggravate joint pain afterwards. In addition, the joints should be well protected in daily life to avoid injuries such as joint sprains and bruises. If the joints are swollen and have fluid, you should minimize joint flexion and extension activities, such as walking and cycling.