Annular Ligament of the Radius of a Human Male as, Posterior View

Description

Posteriorly, the proximal radius is encircled by the annular ligament, forming a continuous ring that hugs the radial head at the level of the radioulnar joint. The ulna lies medial to the radius, with the radial notch of the ulna receiving the radial head while the humeral capitulum sits superior and slightly lateral at the radiohumeral articulation. The radial collateral ligament complex blends laterally with the annular ligament near the lateral epicondyle of the humerus, while the posterior aspect of the joint capsule spans behind the radiocapitellar joint. Clean geometry. Emphasis on the smooth posterior circumference matters because it clarifies how the annular ligament stabilizes the radial head during pronation and supination without tethering it, a point that can be hard to teach from anterior views alone. Clinically, this anatomy underpins the mechanism of nursemaid’s elbow (radial head subluxation), where traction can allow the radial head to slip distally from the annular ligament, and it also frames lateral elbow pain patterns when the radial collateral ligament complex is stressed. The posterior perspective also helps orient surgeons during lateral approaches to the radiocapitellar joint, where preserving the annular ligament and adjacent stabilizers limits postoperative posterolateral rotatory instability. Use this artwork in upper-limb anatomy labs to pair bony landmarks (capitulum, radial head, radial notch) with ligamentous constraints, or in orthopaedic and sports-medicine teaching files covering radial head subluxation, radial head fractures, and lateral collateral ligament injuries. It also fits cleanly into textbooks and procedural guides explaining radiocapitellar arthroscopy portals and the ligament anatomy encountered in lateral elbow exposure. Anatomical accuracy verified by SciePro's Medical Advisory Board.