The bursa is an important structure in the joints of the human body that can secrete joint lubricating fluid, once the bursa fluid phenomenon should first consider whether the bursa is occluded. The main manifestation of bursal effusion is obvious localized swelling, pain, limited joint movement or joint soreness, swelling, some relatively more serious bursal effusion, will produce more obvious severe pain in the joints, and in the joint pressure or joint weight bearing, the pain will be obviously aggravated. Once this situation should be timely treatment, clinical commonly used is the small knife therapy, the use of small knife cutting principle of bursa atresia location for cutting treatment, so that the bursal effusion to reduce or disappear, after the treatment can significantly improve the symptoms of joint pain and limited joint activity.