humeroradiallederna

The humeroradial joint is one of the three articulations that make up the elbow. It is a synovial joint formed between the capitulum of the humerus and the fovea of the radial head. This articulation is a pivot joint, allowing for pronation and supination of the forearm. The humeroradial joint is inherently less stable than the humeroulnar joint, relying on ligaments and surrounding muscles for support.

The primary movements at the humeroradial joint are rotation of the radius. While the humeroulnar joint primarily contributes to flexion and extension of the elbow, the humeroradial joint plays a crucial role in the rotational components of forearm movement, which are essential for many daily activities. The joint capsule is thickened by the radial collateral ligament, which reinforces the lateral aspect of the elbow and helps to prevent varus stress. The annular ligament also plays a significant role in stabilizing the radial head within the radial notch of the ulna, indirectly contributing to the stability of the humeroradial articulation.

Common injuries to the humeroradial joint can include fractures of the radial head, which can impair its ability to articulate properly with the capitulum. Arthritis can also affect this joint, leading to pain and restricted movement. The close proximity and interdependence of the humeroradial, humeroulnar, and proximal radioulnar joints mean that pathology in one can often affect the others.