The articulation of the radius and ulna in the arm is a pivot joint.

Behind this bone, the radius - a lower arm bone in line with the carpometacarpus - was unusually thick compared to the relatively slender companion bone, the ulna.

Methods 30 patients were treated with ulna by triangular nail and tension band and radius by plate fixation. 25 patients were treated with both ulna and radius by titanium plate fixation.