Head Of The Radius, Lateral View

Description

Caput radii (radial head) occupies the proximal end of the radius at the elbow, with its superior articular fovea oriented toward the capitulum of the humerus and its circumferential articular rim facing medially toward the radial notch of the ulna. In this lateral perspective, the radial head appears as a circular expansion sitting immediately superior to the radial neck, with the lateral margin of the rim and the contour of the proximal metaphysis emphasized against the forearm axis. The proximal radius lies lateral to the ulna in anatomical position, and the head sits inferior to the lateral epicondyle region of the distal humerus. The curvature reads clearly. Radial head morphology matters because it is the bony key to both the humeroradial articulation and the proximal radioulnar joint, where the annular ligament encircles the head and stabilizes forearm pronation and supination without compromising congruence. A lateral view like this supports teaching and reporting of Mason classification radial head fractures by focusing attention on the rim and superior surface, the areas most often impacted in a fall on an outstretched hand, and it pairs well with discussion of associated injuries such as lateral collateral ligament complex disruption or an Essex-Lopresti pattern with interosseous membrane injury and distal radioulnar joint instability. The crisp bony edges also help learners distinguish the articular rim from the nonarticular neck and proximal shaft. Orthopedic and sports medicine educators can place this illustration in elbow modules to anchor terminology (caput radii, collum radii) and surface anatomy, while authors of fracture management texts can use it alongside radiographs or CT reformats to orient readers to the radial head rim and fovea. Surgical training materials for lateral elbow approaches, radial head fixation, or arthroplasty can also reference the same perspective when discussing safe zones and implant sizing. Anatomical accuracy verified by SciePro's Medical Advisory Board.