Movement at the distal radial-ulnar joint
This joint, together with the proximal radio-ulnar joint, allows for the pronation and supination of the forearm.
The ulnar notch of the lower end of the radius moves circumferentially along the articular circumference of the ulnar head (lower end of the ulna).
The supinating and pronating movements are performed in the range of 90° and 85°, respectively.