Swollen elbow can not be straightened may be a serious local edema, elbow joint dislocation, or even fracture. You should seek medical treatment as soon as possible, go to the hospital for X-ray examination, make a clear diagnosis, and take conservative, joint repositioning, external fixation or surgical treatment according to the specific situation. 1. Severe localized edema: after a fall, it may cause localized edema, accompanied by severe pain, unable to straighten. At this time, local cold compresses should be applied and Yunnan Baiyao aerosol sprayed externally. 2. Elbow joint dislocation: If the joint is dislocated, the elbow joint is deformed, resulting in the inability to straighten. At this time, the joint should be reset in time, after reset to take the plaster and other external fixation treatment. 3. Fracture: Fracture of the arm and deformity of the fracture site can also lead to inability to straighten. If the damage is mild, then no surgery, take manipulation, plaster external fixation can be; if serious, such as damage to large blood vessels, nerves, etc., should be surgical restoration, such as internal fixation, external fixation. If you fall and hurt your elbow, you should seek medical treatment as soon as possible if you have severe pain, bone rubbing sound, bone rubbing sensation, local activity limitation, etc., so as not to delay your condition.