Head of radius

Anterior view of the radius bone showing the head of the radius at the top. Image courtesy of Wikimedia Commons.

The head of radius is a part of the radius bone in the human forearm. It is a cylindrical structure located at the top of the radius bone, near the elbow joint. The head of the radius is a key component in the arm's ability to rotate and bend.

Structure

The head of the radius is disc-shaped and smooth, designed to fit into the radial notch of the ulna, the bone parallel to the radius in the forearm. This articulation allows for the rotation of the forearm, such as when turning a doorknob or screwdriver.

Function

The head of the radius, in conjunction with the ulna, allows for two types of movements at the elbow joint: flexion and extension (bending and straightening the arm), and pronation and supination (rotating the forearm).

Clinical Significance

Injuries to the head of the radius can occur due to falls, direct blows, or twisting injuries. A common injury is a Radial head fracture, which can cause pain, swelling, and difficulty in bending or rotating the arm. Treatment may involve rest, immobilization, physical therapy, or in severe cases, surgery.

See Also

• Radius (bone)
• Elbow
• Ulna
• Radial notch
• Radial head fracture

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