Symptoms of patellar bone marrow edema include knee pain, joint mobility disorder, and joint swelling in some cases. 1. Joint pain: patellar trauma, such as kneeling injury, direct impact injury, etc., can cause patellar bone marrow edema, patellar bone marrow edema can appear during the acute period of the knee joint pain symptoms, especially to the patella at the pain is obvious. Pressing pain is obvious. 2. Activity disorder: Bone marrow edema of the patella can affect the function of knee joint activity while causing knee joint pain, and bone marrow edema can cause activity disorder and reduced range of motion in severe cases. 3. Joint swelling: in addition to pain symptoms caused by trauma, patellofemoral bone marrow edema will also cause inflammatory exudation due to local aseptic inflammatory reaction, which will result in knee joint effusion and knee joint swelling. Patellar bone marrow edema need to go to the regular hospital as soon as possible, standardized diagnosis and treatment.