The elbow joint consists of the ulna, the upper radius and the lower humerus, including the humeral ulnar joint, the humeral radius joint and the proximal radius joint: 1. Humeral ulnar joint: a pulley joint composed of the humeral pulley and the ulnar pulley notch; 2. Humeral radius joint: a ball and socket joint composed of the humeral tuberosity and the radial head articular recess, which should have three orientations of movement, but due to the limitation of the ulna, it cannot do internal abduction and adduction; 3. Proximal radius ulnar Joint: A cylindrical joint formed by the circumferential articular surface of the radius and the ulnar radial notch. Elbow joint functions include flexion, extension and rotation, with anterior rotation and posterior rotation occurring in the proximal radial-ulnar joint and flexion and extension occurring in the brachioradialis and brachioradialis joints. The joints rely on the radial collateral ligament, ulnar collateral ligament, and radial circumferential ligament to strengthen and stabilize each other. The elbow joint is susceptible to trauma, which may result in limited joint function, joint pain or even interfere with normal life. When the joint is injured or has symptoms such as pain or stiffness, it is important to go to the hospital for medical imaging in a timely manner. Treatment can be done through medication and physical methods, or if more serious, surgical methods can be chosen.