A, the following causes of pain Patellar tendonitis 1, pain location The most common cause of knee pain is patellar tendonitis, the pain point is located below the kneecap, if the knee played straight, finger pressure on the lower edge of the knee, you will feel the pain, patients often squat to stand up! 2, the cause of the occurrence of long standing or labor, often running and jumping and other actions. 3.Treatment Pay more attention to rest, according to the condition to give rehabilitation exercises, plaster paste treatment, shock wave therapy, radio frequency and other treatment, if necessary, surgery is needed, such conditions if mistaken for degenerative arthritis, according to the symptomatic treatment effect is not good. Synovitis of the knee joint Synovium is one of the main structures of the knee joint, covering the inner side of the joint capsule and containing rich vascular connective tissue. As synovial cells can secrete synovial fluid, they can keep the joint cartilage lubricated and thus increase the range of motion of the joint. 1.Pain location The knee joint will not only be swollen and painful and fluid accumulation symptoms, but also due to adhesions, making the range of motion smaller, so the knee can not be completely straight, nor can it be completely bent and squatted. 2, the cause of overwork or improper use, may cause acute inflammation of the synovial membrane, the joint will produce a large amount of fluid and synovial membrane thickening, making the fibers harden and lose elasticity, can be treated with plasters. The location of the pain is different from that of patellar tendonitis, it is on the inside of the knee joint, above the tibia, and you will feel pain when you press with your fingers. 2, the cause of the occurrence of jogging, downhill, excessive walking and sports, are the causes of goose palm tendonitis. However, there are also injuries to the goose palm muscle due to inappropriate prolonged sitting and inappropriate stretching and stretching.