0 a flat shape with four sides, where two of the sides are parallel --
1 a bone in the wrist at the base of the thumb --
The trapezium is the most radial of the bones surrounding the carpal tunnel.
The third metacarpal is connected to the trapezium, to the capitate, and to the hamate.
The second metacarpal is connected to the trapezium.
After arthrodesis, non-union, in which fusion of the trapezium bone with the metacarpal bone fails, occurs in 8% to 21% of the cases.
The opponens pollicis originates on the tubercle of the trapezium and the flexor retinaculum.
The "lateral surface", convex and smooth, articulates with the trapezium.
The scaphoid contributes to the stability of the midcarpus as it articulates distally with the trapezium and the trapezoid.
The second metacarpal bone is connected to the trapezium, trapezoid, and capitate.
