- The radius is the lateral bone of the forearm.
- The radius articulates with:
- the humerus proximally, forming the elbow (humeroradial) joint.
- the ulna medially, forming the three radioulnar joints.
- the carpals distally, forming the wrist (radiocarpal) joint.
- The radius forms the principal articulation with the carpals at the wrist (radiocarpal) joint.
- The styloid process of the radius projects farther distally than the styloid process of the ulna. For this reason, from anatomic position, there is less radial deviation (abduction) of the hand at the wrist than ulnar deviation (adduction).