Proximal radioulnar articulation Tags: Anatomical Structure.The proximal radioulnar articulation (superior radioulnar joint) is a trochoid or pivot joint between the circumference of the head of the radius and the ring formed by the radial notch of the ulna and the annular ligament. thumbnail Dorlands prefix a_64 Dorlands suffix 12161505 Gray page 324 Gray subject 85 Learn more... Loading...