Small needle knife therapy is applied to some intractable pains of various limb and trunk soft tissue injuries, osteophytes, tenosynovitis, bursitis, accumulative muscle and ligament injuries, ossifying myositis, traumatic muscle spasm and muscle tension, injury sequelae, surgical injury sequelae and various pathological injury sequelae in orthopedic injury department. Small needle knife has the characteristics of both needle and knife, it is made of metal, thicker than ordinary needles, and its end side is a knife-like surgical instrument. It has a length of 10-15cm and a diameter of 0.4-1.2mm, which is based on the ancient needles and sharp needles, and is developed by the modern medical surgical knife. The treatment principle of small needle knife is mainly to pass the pain, the pain is not pass, the accumulation of the broken, the collection of the dispersed and the contracted Zhang. It is mainly applied to: 1) patients with limited pain and pressure points; 2) patients with clear subcutaneous nodes and cords; 3) patients with tendon compression. Small needle knife is reliable for the above diseases. Because the needle knife surgery are deep into the tendons, joint space, soft tissue deep cut and peel, once the infection will cause deep abscess, so there are certain contraindications, such as the surgical site with skin infection, important neurovascular, patients have a tendency to bleeding, high blood sugar or high blood pressure are not suitable for small needle knife treatment.