The symptoms of injury to the joint capsule are as follows: a. Significant pain, mainly because the peripheral nerves in the joint capsule are injured after the injury, and the peripheral nerves are stimulated, resulting in significant pain, and because the surrounding tissues are edematous after the injury, the inflammatory metabolites also stimulate the peripheral nerves, resulting in further pain. The joint cavity of the joint capsule is obviously swollen, mainly due to the rupture of the small blood vessels inside the joint capsule after the injury and the leakage of blood, which gradually increases and leads to the gradual increase of the bloody fluid in the joint capsule, resulting in obvious swelling, and also due to the formation of inflammatory edema, which will lead to more obvious swelling. Third, the obvious adverse joint movement, mainly due to the injury after the activity will pull the injured nerve, there is a significant pain, and when the activity will also pull the injured joint capsule, resulting in further aggravation of the injury, the pain is more obvious, therefore, there will be unfavorable movement situation.