Glosaurus
Human Anatomy

Distal radioulnar joint

A pivotal joint that connects the distal ends of the radius and ulna, enabling forearm rotation.
The distal radioulnar joint is a synovial pivot joint located in the forearm. It involves the articulation between the head of the ulna and the ulnar notch of the radius. This joint acts as a point of rotation for the forearm, allowing for the proper functioning of the wrist and hand.
Terminologia Anatomica
articulatio radioulnaris distalis
System
Musculoskeletal system
Function
The primary function of the distal radioulnar joint is to facilitate the pronation and supination of the forearm. These movements are essential for a variety of daily activities, such as turning a doorknob or using a screwdriver. When you turn your palm up (supination) or down (pronation), the radius rotates around the ulna at the distal radioulnar joint. This joint's unique structure, with a disc-shaped head of the ulna fitting into the notch of the radius, allows for smooth and efficient movement. Additionally, this joint helps maintain forearm stability and contributes to the overall functionality of the wrist and hand.
Location
The distal radioulnar joint is located at the distal (far) ends of the forearm. It sits approximately 1 to 2 centimeters proximal to the wrist joint, with the radius and ulna running parallel to each other in the forearm. This joint is positioned on the medial side of the forearm, and it can be palpated just above the wrist crease, making it accessible for clinical examination. Its proximity to the wrist allows for the integration of movements that occur at both this joint and the wrist itself, highlighting its importance in upper limb mechanics.
Did You Know?
  • The distal radioulnar joint is critical for tasks that require both strength and precision, such as typing or playing musical instruments.
  • Injury or dysfunction in this joint can lead to significant impairment in hand movements and grip strength.
  • The joint is surrounded by a synovial membrane that produces fluid to lubricate the joint, enhancing its movement.