Standing for a long time inside the knee joint pain, common causes are the following: First, belong to the normal physiological response, after a long time standing knee joint pressure is too high, too heavy load, the blood circulation of the bone appears corresponding impact, produce corresponding ischemia, hypoxia, will produce irritation pain. Second, it can be seen in osteoarthritis, which is caused by degeneration of the knee joint, with bone degeneration and hyperplasia, thinning of the articular cartilage, and even peeling and tearing, resulting in painful symptoms when standing for a long time. Thirdly, soft tissue injury and strain on the knee joint, including meniscal injury, periprosthetic strain and ligament injury, can lead to instability of the knee joint, which can aggravate the instability of the knee joint and produce painful symptoms after standing for a long time.