Os capitatum

Os Capitatum is one of the eight carpal bones in the human hand. It is located in the distal row of carpal bones, and it is the largest of the carpal bones. The os capitatum is also known as the capitate bone due to its head-like shape.

Anatomy

The os capitatum is situated in the center of the wrist. It is distinguished by its rounded head, which articulates with the lunate bone and the scaphoid bone. The head is directed proximally, while the body of the bone extends distally. The os capitatum also articulates with the third metacarpal bone, and occasionally with the second and fourth metacarpal bones.

Function

The os capitatum plays a crucial role in the movement of the wrist and hand. It allows for the flexion, extension, abduction, and adduction of the wrist. The os capitatum also contributes to the stability of the wrist joint.

Clinical Significance

Injuries to the os capitatum are relatively rare due to its protected position in the wrist. However, fractures can occur, often as a result of a fall onto an outstretched hand. These fractures can be difficult to diagnose due to their location and the complexity of the wrist anatomy. Treatment typically involves immobilization, but surgery may be required in severe cases.

See Also

• Carpal bones
• Hand
• Wrist