Triamcinolone acetonide medium-acting anti-inflammatory and analgesic drugs, commonly used to treat local aseptic inflammatory reaction, degeneration resulting in chronic pain, often hit the site is in the joint cavity and the location of local pain points, common side effects are as follows: first, cause local infection, because puncture is easy to bring in vitro bacteria into the body, and the local anti-infective ability of the tretinoin hit after the decrease, so it is easy to infection, in The operation should be strictly aseptic, and the operation should be standardized in order to reduce the risk of infection. Secondly, if tretinoin is inadvertently injected into the muscle or tendon, it will cause obvious pain and also damage the normal tissues of the muscle and tendon, leading to degeneration, necrosis and rupture of the muscle and tendon. Third, tretinoin is a medium-acting drug, often requiring multiple injections. Fourth, frequent injections of tretinoin can cause local skin thinning and muscle atrophy.