The weather is getting colder and the number of knee pain cases seen in the clinic is increasing. What do you need to be aware of when you find yourself in knee pain? What do I need to do before visiting the clinic? 1. Do you have any of the following discomforts: Pain level: Does it hurt to walk on level ground? Does it hurt to walk up and down stairs? Does it hurt to rest in bed? Does it hurt to squat and stand up? –This may be related to the degree of cartilage damage in the joint. Restriction of movement: Is there any joint popping during movement? Is there any joint interlocking (joint suddenly stuck, unable to flex and extend) during activity? –may be related to joint free bodies or meniscal damage. Joint instability: Do you feel any weakness in the joints during activity? Is there any fear of exertion during the activity? Is there any discomfort when stopping sharply or changing direction suddenly when walking straight? –may be related to joint ligament lesions. Joint swelling: How serious is the swelling, and is there any history of recurrent attacks? –may be related to synovial lesions. Joint deformity: Is there any loss of joint extension or flexion or excessive valgus angle? A normal knee can be fully extended or even mildly hyperextended with mild valgus, and flexion can be up to 135 degrees. A deformity of the joint can present as an inversion of the knee, also known as “rotundity” or O-leg. Severe valgus knee is also known as K-leg. 2. History of sports injuries, including previous history of joint fractures and sprains. 3. Possible tests: Knee x-ray (the easiest and quickest way to assess joint growth, joint surface sclerosis, free bodies, joint force lines, patellar tenderness, etc.). Therefore, it is important to inform your physician in advance if you are pregnant or preparing for pregnancy (although the current radiation dose from X-rays is very small and there is no documented evidence that plain X-rays can cause fetal malformations). MRI of the knee (the most accurate way to assess knee meniscal damage, ligament damage, synovial lesions, cartilage damage, joint effusion, etc.), so special metal objects in the body such as pacemakers, cochlear implants, and metal foreign bodies in the eyes are prohibited. MRI examination is acceptable. Laboratory tests (including routine blood, blood sedimentation, CRP, blood uric acid, coagulation function, rheumatic immunity-related indicators, etc.), so try to visit the clinic in the morning on an empty stomach, that is, fasting from food and water for more than 6 hours. 4, need to prepare protective gear: hiking poles (crutches) – leave behind the face, do not be afraid of cold adulteration, more than one support, the joints are more than one protection. Knee pads – not only to keep warm, but also has the role of auxiliary support. It is recommended to buy adjustable elastic knee pads with Velcro. 5, sports note: prohibited to do climbing, stair climbing sports, try to avoid squatting, long distance walking. You can ride a bicycle (recommended for home cycling).