carpal tunnel syndrome. 1  a medical condition that is characterized by pain, numbness, etc. in the wrist, palm, fingers, and thumb, usually caused by repetitive hand movement, as in typing or knitting, which swells the tissue surrounding the nerve in a tunnel-like passage (carpal tunnel) in the wrist.
1 The radius is located laterally, nearer the thumb, and the ulna medially, nearer the little finger.The radius and the ulna have a styloid process at the distal end and are attachment sites for many muscles.  The radius is smaller than the ulna.
The ulnar styloid is at the end of the other forearm bone, the ulna. While distal radius fractures usually require casting or surgery, the ulnar styloid is seldom addressed in treatment. Ulnar styloid fractures seldom require treatment when they occur in association with a distal radius fracture. The major exception is when the joint between these bones, the distal radioulnar joint (or DRUJ), is unstable. When the DRUJ is unstable, the ulnar styloid may require independent treatment.