The most accurate imaging tests for knee diseases are usually done, such as X-ray, CT, MRI, and so on. 1. X-ray examination: X-ray imaging can be used to clarify the width of the bone gap in the knee area, whether there are fractures and dislocations, which can accurately determine the site of knee injury and provide a strong diagnostic basis for diagnosing the disease. 2. CT examination: CT examination can be carried out for hidden injuries that cannot be clarified by X-ray examination. 3. Magnetic resonance examination: Through magnetic resonance examination, it can clarify whether the cartilage, ligament and bone marrow in the knee area are diseased or not, and it can also clarify whether there is fluid inside the knee. Compared with X-ray and CT, MRI is more comprehensive and can determine the root cause of knee problems. 4. Other: Knee diseases can also be diagnosed through arthroscopy and synovial fluid examination. In case of abnormal imaging results, it is recommended to consult a doctor in time to clarify the cause of the disease and to carry out targeted treatment or therapy.