The patient’s knee is too prominent, commonly due to muscle atrophy, joint inflammation and other reasons, as follows: First, muscle atrophy: the patient appears to have significant atrophy of the leg muscles, especially the quadriceps, muscle atrophy will obviously set off the knee joint too prominent, commonly in patients due to cerebrovascular disease or leg fractures, etc., the need for bed rest, braking patients, muscle secondary atrophy, malnutrition is more obvious symptoms. Second, joint inflammation: patients suffering from severe knee osteoarthritis, rheumatoid arthritis, can cause knee osteophytes, skeletal deformities, will be manifested as too prominent knee joint, taking X-rays will find changes in the knee joint, lower limb force line may even appear abnormal, the patient will have joint pain, limited movement. Therefore, the common causes of overly prominent knee joints are as above. Early diagnosis and early treatment can lead to improvement of the above clinical symptoms.