The document provides an overview of the elbow joint, describing it as a synovial joint with three main articulations: between the humerus and ulna, humerus and radius, and radius and ulna. It explains that the joint permits extension and flexion and highlights the roles of various ligaments including the ulnar collateral and radial collateral ligaments. Additionally, it details the anatomical features such as the trochlea and olecranon fossa, and discusses the rotation of the radius about the ulna for movements like supination and pronation.