The coronoid process of the ulna is crown-shaped, similar to the crown of a rooster, and is also called the coronoid process of the ulna. The coronoid process is located on the anterior side of the elbow joint, and a small protrusion of the human ulna can be found on X-ray, which has a blocking effect and mainly prevents the elbow joint from dislocating to the posterior side. The coronoid process of the ulna includes the anterior joint capsule, the anterior bundle of the medial collateral ligament and the brachioradialis muscle, which are the attachment points of the important soft tissues of the elbow joint. Fractures in this area are most often caused by violent trauma and are called ulnar coracoid fractures. Although the fracture is small, it can indicate a complex injury to the elbow joint, which is part of a complex fracture-dislocation of the elbow joint that can result in tearing of soft tissues such as the lateral collateral ligaments and the joint capsule, and even accompanying joint trauma. Fractures of the coronoid process of the ulna should be treated surgically in most cases. Ensuring structural stability and active rehabilitation with early mobility exercises prevents the development of joint stiffness and traumatic joint degeneration.