Meniscus second degree injury six months or pain, may be due to weight-bearing labor, synovitis and osteoarthritis and other factors. 1. Weight-bearing strain: meniscus injury will lead to soft tissue damage in the joints, if the patient usually bear too much weight or walk too much, etc., will make the original joint damage aggravated, causing knee pain. 2. Synovitis: when patients often climb mountains, stairs or fatigue running around and other knee joints when excessive exercise, aggravate knee meniscus damage, will trigger aseptic inflammation in the joints, resulting in the emergence of synovitis, pain and swelling of the knee joint. 3. Osteoarthritis: If the meniscus injury is not treated in time, excessive wear and tear of the joint for a long time will lead to localized aseptic inflammation in the knee joint, developing into osteoarthritis, with inflammatory factors stimulating the knee joint to appear painful symptoms. Meniscus injury is categorized into three degrees, the second degree of injury belongs to the meniscus of the medium degree of injury, the main manifestation of the damage surface does not reach the joint surface, that is, the meniscus is not completely broken. It is recommended that patients with meniscus injuries actively cooperate with doctors to carry out standardized treatment, so as not to delay the condition.