The trapezium articulates with the scaphoid bone, trapezoid bone, the first metacarpal and the second metacarpal.
The scaphoid bone is shaped like a boat and resembles a cashew nut in appearance. It is proximal to the ulna and radius bones of the arm.
The scaphoid is a carpal bone which is unique in both its shape and function. It has a three-dimensionally oblique orientation and performs a unique function as a mechanical link between the distal and proximal carpal rows on the radial aspect.