The common causes of sprained fingers that can not be bent include fractures, tendon injuries, joint injuries, etc. The causes are different, and the treatment methods are different, so we should consult the doctor in time to find out the cause of the disease, and the common treatments include general treatment, medication, and surgical treatment. 1. Fracture: It is mainly treated by manipulation and external fixation, placing a plaster aluminum plate at the finger, and then doing traction on the finger to help reset it. Wide adhesive tape can be used to fix the finger on the aluminum plate. For extremely unstable fracture, internal fixation can be performed by incision and repositioning. 2. Tendon injury: mild tendon injury can be fixed with plaster in knee-flexion position or plantar-flexion position, and when the pain is severe, non-steroidal anti-inflammatory drugs can be used as prescribed by the doctor, such as diclofenac sodium, indomethacin and so on. Conservative treatment is ineffective in tendon injury can take surgical treatment, and strengthen the exercise under the protection of the support after the operation. 3. Joint injury: if the fracture range is small, the alignment is good, and the main external fixation does not affect the joint surface of the finger, but if the serious fracture involves the joint surface and seriously affects the daily functional activities, surgical treatment can be adopted. Finger sprains can not bend the situation, we should consult the doctor in time, clear the cause of the disease and follow the doctor’s instructions to take treatment, so as not to delay the condition.