Subpatellar fat pad damage is a clinical syndrome in which aseptic inflammation occurs due to chronic damage to the subpatellar fat pad, causing anterior knee pain and knee joint dysfunction. The infrapatellar fat pad is a triangular-shaped block of fatty tissue located in the vertebral space behind the patella, lower anterior femoral condyle, anterior superior tibial edge and patellar ligament, which has the function of strengthening the knee joint stability and reducing friction. When knee hyperextension injury, fat pad compression, or repeated and repeated cumulative injuries (e.g., athletes, tricycle workers, porters, etc.), etc., the infrapatellar fat pad can become congested, swollen, hypertrophied, and have a sterile inflammatory response, resulting in pain. In addition, knee instability, knee synovitis, patellar tenderness, osteoarthrosis, rheumatoid arthritis, etc., can cause secondary fat pad inflammation. Clinical manifestations The disease mainly occurs in middle-aged and elderly people, and most of them have a history of knee hyperextension injury or cumulative injury. The onset of the disease is slow, with early manifestations of knee discomfort, coldness and vague pain, joint instability, easy to fall when moving, sometimes light and sometimes heavy; finally it may develop into persistent anterior knee pain, heavy when going up and down stairs, radiating to the N fossa, or even along the back of the calf muscle to the heel, and in severe cases the patient has difficulty squatting and cannot flex and extend the knee joint. Physical examination shows fullness at the knee eye socket, and deep pressure pain in the patellar ligament or positive patellar friction test. Knee x-ray has no abnormal performance, but has differential diagnostic value. Treatment 1, general treatment Rest, massage, local heat, acupuncture, oral anti-inflammatory and analgesic drugs, etc., can effectively control and relieve the condition. 2.Subpatellar block therapy can effectively eliminate inflammation, improve local circulation and metabolism, prevent or loosen adhesions, and eliminate pain.