The radial head is the upper, rounded part of the radius, one of the two bones in the forearm, which sits directly at the elbow joint. It forms the joint head of the radius and is essential for the movement of the forearm, especially when turning the palm upwards or downwards.
Where is the radial head located?
Directly below the elbow, on the thumb side of the forearm, sits the radius. Its upper end, the radial head, looks like a small, smooth button. It rests in a hollow of the upper arm bone and is held in place by a ring-shaped band of tissue called the annular ligament. This connection allows the forearm to rotate without the bones slipping out of place.
What does the radial head do?
Without this small piece of bone, rotating the forearm, for example when unscrewing a jar or turning the hand over, would not be possible. The radial head works like a pivot joint. Together with the annular ligament, it allows the radius to rotate around its own axis while the ulna, the second forearm bone, stays largely still. This design makes very precise and flexible hand movement possible.
Importance in injuries and complaints
The radial head is an anatomical term that describes only one part of the bone. In medical reports, the term usually appears when there are injuries, fractures, or other changes in this area. A typical example is a radial head fracture, which is a break in this section of bone that happens most often after a fall onto an outstretched arm. Dislocations, for example in children, can also affect the joint. In such cases, the term radial head is used to describe exactly which part of the forearm is affected.
What does the term mean in a doctor's letter?
If the term radial head appears in a medical report, it always refers to the upper part of the radius. It is usually mentioned in connection with an imaging examination, such as an X-ray or MRI, to describe the position, shape, or any unusual findings. Without additional terms such as "fracture" or "dislocation", it is simply an anatomical description and not a diagnosis or condition.
Why is the radial head medically important?
Because the radial head plays a central role in elbow movement, it needs particular attention during injuries or operations. Even small changes can limit the rotation of the forearm or cause pain. This is why doctors pay close attention to this area when examining the elbow joint.
Summary
The radial head is an important part of the elbow joint and allows the forearm to rotate. In medical texts, the term always describes the upper, rounded part of the radius. Only when combined with further terms, such as a fracture, does the expression take on a meaning related to illness or injury. In normal circumstances, the radial head is simply a part of the healthy skeleton that is needed for many everyday movements.
