Unciform bone

Unciform Bone

The Unciform bone (also known as the Hamate bone) is one of the eight small carpal bones that are arranged in two rows in the human hand. It is located on the ulnar side of the carpal bone, near the pinky finger. The unciform bone is unique among the carpal bones due to its hook-like structure, known as the hamulus or hook of the hamate, which protrudes anteriorly.

Structure

The unciform bone is wedge-shaped, with its base facing towards the palm. It has six surfaces: superior, inferior, dorsal, palmar, medial, and lateral. The palmar surface features the prominent hook of the hamate, which serves as an attachment point for various ligaments and tendons.

Function

The unciform bone, like other carpal bones, contributes to the flexibility and strength of the hand. It plays a crucial role in wrist movement and stability. The hook of the hamate serves as a pulley for tendons of the little finger, aiding in its movement.

Clinical Significance

Injuries to the unciform bone, particularly fractures of the hook of the hamate, are relatively rare but can be significant. They are often caused by direct trauma or repetitive stress, particularly in sports like golf and baseball. Diagnosis can be challenging due to the bone's small size and location, and may require advanced imaging techniques such as CT or MRI.

See Also

• Carpal bones
• Hand
• Hamate bone
• Hamulus