Radial Collateral Ligament, Lateral View

Description

Oriented in a lateral perspective, the elbow complex is presented with the distal humerus articulating with the radial head and the proximal ulna at the humeroulnar and humeroradial joints. The radial collateral ligament (lateral collateral ligament complex) arises from the region of the lateral epicondyle and spreads distally in a fan-shaped sheet, blending with the annular ligament that encircles the radial head. Deep to the capsular tissues, the ligament fibers sit lateral to the radiocapitellar articulation and anterior to the posterolateral contour of the ulna. Bony landmarks. Clear margins. Clinically, this lateral ligamentous anatomy matters because the radial collateral ligament and its continuity with the annular ligament form the primary restraint to varus stress and posterolateral rotatory instability at the elbow. Tears after a fall on an outstretched hand, or iatrogenic attenuation after lateral epicondylitis surgery, can permit subluxation at the radiocapitellar joint with symptomatic mechanical clicking and a positive pivot-shift test. This view also supports teaching the relationship between the ligament complex and the posterolateral approach corridor, where respecting the lateral ulnar collateral component helps avoid instability. Orthopedic and sports medicine educators can place this illustration into elbow modules covering collateral ligament anatomy, varus stability testing, and the mechanism of posterolateral rotatory instability. Medical publishers will find it well suited for operative technique atlases describing lateral elbow exposure, annular ligament repair, or ligament reconstruction in recurrent instability, and for radiology teaching files that correlate lateral soft-tissue anatomy with MRI findings around the radial head and capitellum. Anatomical accuracy verified by SciePro's Medical Advisory Board.