Radioulnar joint

A critical connection that allows forearm rotation and movement of the wrist.

The radioulnar joint is the anatomical junction between the radius and ulna, two long bones in the forearm. This joint consists of two distinct areas: the proximal radioulnar joint located near the elbow and the distal radioulnar joint located close to the wrist. Both regions work together to facilitate the rotational movement of the forearm, enabling actions such as pronation (turning the palm down) and supination (turning the palm up).

Terminologia Anatomica

articulatio radioulnaris

System

Skeletal system

Function

The primary function of the radioulnar joint is to allow the forearm to rotate, which is vital for a variety of everyday activities. This joint plays an essential role in facilitating motion between the radius and ulna, leading to smooth transitions during actions such as using a screwdriver or turning a doorknob. The unique structure of the radioulnar joint, characterized by a pivot action, enables the radius to cross over the ulna during pronation and realign during supination. This rotational capability is vital in many sports, providing the necessary flexibility in movement for throwing or swinging tasks, and is crucial for the functionality of the wrist and hand during complex tasks.

Location

The proximal radioulnar joint is located just below the elbow joint, where the head of the radius articulates with the radial notch of the ulna. This joint is encased in a fibrous capsule and reinforced by ligaments that provide stability while allowing rotation. Meanwhile, the distal radioulnar joint is found at the distal ends of the radius and ulna, close to the wrist. Here, the ulnar notch of the radius meets the head of the ulna. Together, these joints enable the intricate movements of the forearm, making them essential for a wide range of motions and adjustments that the hand is capable of executing.

Did You Know?

The ability to rotate the forearm is crucial for many tasks performed in everyday life, such as typing or playing musical instruments.
Injury to the radioulnar joint can significantly impact one's ability to perform basic movements and may require physical therapy for recovery.
The radioulnar joint is often involved in sports-related injuries, particularly in activities that require a strong rotational component, such as throwing sports.
The radius is capable of moving around the ulna at the radioulnar joint, allowing the forearm to perform actions that are otherwise impossible with a fixed bone structure.