The fat pad of the knee is located in the knee joint cavity, below the patella, and if the fat pad of the knee is damaged, the following symptoms can often occur. First, pain, which can be noticeable below the knee and on both sides of the patellar tendon, is also obvious when pressure is applied, especially when the joint does flexion and extension activities or running and jumping movements, the knee pain is very significant. Secondly, swelling, fat pad injury can occur on the medial and lateral sides of the knee, which can be examined to rule out any joint effusion. Third, limited activity, knee fat pad injury if there is severe pain, can lead to significant poor knee movement, knee fat pad injury to early rest and certain treatment, if serious may also need to undergo arthroscopic surgery.