radioulnale

The radioulnar, also known as the radioulnar joint, refers to the functional connection between the radius and ulna bones in the forearm. These two long bones extend from the elbow to the wrist and are crucial for forearm movement and stability. The joint allows for the rotational movements of pronation and supination, enabling the palm to turn upward or downward.

There are two primary radioulnar joints: the proximal radioulnar joint, located near the elbow, and the distal radioulnar joint, situated near the wrist. Both joints are classified as pivot joints, permitting rotational movements around a longitudinal axis. The proximal joint involves the head of the radius fitting into the radial notch of the ulna, while the distal joint involves the head of the ulna fitting into the ulnar notch of the radius.

Ligaments and an interosseous membrane connect the radius and ulna along their lengths, providing stability during movement. The interosseous membrane also serves as an attachment site for muscles and transmits forces from the hand to the upper arm.

Injury or degeneration of the radioulnar joint, such as dislocation or fracture, can impair rotational movement and forearm stability. Common conditions include traumatic dislocations and chronic instability, which may require medical intervention ranging from immobilization to surgical repair.

Understanding the anatomy and mechanics of the radioulnar is essential in diagnosing forearm injuries and planning appropriate treatment. It plays a vital role in daily activities, including turning a doorknob, using tools, or performing sports movements.