Neck Of The Radius, Lateral View

Description

Collum radii (neck of the radius) is centered in this lateral view as the narrow, slightly constricted segment immediately inferior to the caput radii and superior to the tuberositas radii. The radial head’s articular circumference for the annular ligament is visible proximally, while the bicipital tuberosity projects on the proximal medial aspect just distal to the neck, marking the transition into the proximal shaft. From this fixed lateral perspective, the neck reads as a short cylindrical column between the disk-shaped head above and the irregular metaphyseal flare below, with the lateral cortex forming a clean contour toward the radial styloid side. Fractures at the radial head and neck are common after a fall on an outstretched hand, and subtle angulation at the collum radii can be easy to miss when you do not have a strong mental model of the normal profile. Small changes matter. This viewpoint supports teaching the relationship of the head-neck junction to the proximal radioulnar joint, and it helps explain why surgical exposure for radial head fixation or arthroplasty must respect the lateral soft-tissue envelope, including the annular ligament and the nearby course of the posterior interosseous nerve as it approaches the supinator (Arcade of Frohse) just distal to the neck. Orthopedic and anatomy faculty can place this illustration alongside AP and lateral elbow radiographs to reinforce recognition of radial neck alignment, head offset, and the location of the tuberositas radii for distal biceps tendon insertion. Authors will also find it suitable for chapters on elbow trauma, Monteggia-pattern injury discussions, and operative approaches that use the lateral (Kocher) interval as a conceptual reference for the proximal radius. Anatomical accuracy verified by SciePro's Medical Advisory Board.