ABSTRACT
Introduction The radius and ulna form the bony structure of the forearm. They articulate with
the humerus at the elbow and the proximal carpal row at the wrist. These bones form the framework upon which the long flexor and extensor muscles of the forearm take origin. The radius lies on the thumb side of the forearm (the “radial” side) and the ulna lies on the little finger side (the “ulnar” side) of the forearm. The anatomic shape of these bones and their relationship at the joints provides for a high degree of mobility. However, the price of this mobility is propensity for injury and degenerative disorders.
