The radial head is located at the proximal end of the radius, which is the bone of the anterior wall that rests on the outside, and the part of it that expands at the upper end, is the radial head.

The head of the radius is an important place on the outside of the elbow joint, it is mainly with the humeral tuberosity, forming the brachioradialis joint, and the other ulnar joint to complete the elbow joint flexion and extension of internal rotation action together.

Children's radial head is not yet fully developed and the ligaments are weak, when the elbow joint is straightened, by strong pulling, due to the ligament laxity, easy to cause radial head subluxation.

Expanded

The human body*** has 206 bones, which are divided into 3 major parts: skull, trunk and limbs. They are distributed throughout the body, supporting the body and protecting the internal organs, while being helped by the muscles for various activities.

All the bones in the human body vary in shape and size, with some being larger, such as the tibia and humerus, and others being smaller, such as the phalanges.

The bones can be roughly categorized into five types in terms of shape: long bones, short bones, flat bones, irregular bones, and air-containing bones. Flat bones play a role in protecting internal organs, such as the skull to protect the brain, etc. Rod-shaped bones are responsible for human movement, such as the bones of the limbs.

Baidu Encyclopedia - Radial Head