The left lateral epicondylar humerus fracture can be treated by plaster fixation and incision and reduction surgery. 1. Plaster fixation: the left epicondylar humerus fracture is mild, and does not lead to bone dislocation or deformity can choose the plaster fixation treatment, which is conducive to the gradual healing and repair of the fracture, preventing the fracture from aggravating the degree of damage. 2. Incision and reduction surgery: the length of the left lateral epicondylar fracture of the humerus is more serious, with bone deformity and serious dislocation, it needs to be treated by incision and reduction surgery, the joint capsule is incised in the inner and upper part of the incision to expose the medial epicondyle, which can localize the fracture, and at the same time, it needs to be fixed by using the hollow nails or steel pins, and it is beneficial to the fracture healing and wound healing after the surgery is sutured. Patients with left epicondylar fracture of the humerus are advised to go to the hospital in time, improve the examination to clarify the cause of the fracture, and then give targeted treatment or therapy.