It articulates with the ulna and the humerus. At the distal end, it articulates with the capal bones.
Scaphoid and Lunate
The ulna articulates with the radius and humerus.
The lower extremity of the radius actually has two bones which it articulates with. The carpal and the ulna.
The hyoid bone is the only bone in the adult body that doesn't articulate with another bone.