Scaphoid

A small bone in the wrist that plays a crucial role in hand mobility and stability.

The scaphoid is one of the eight carpal bones located in the wrist. It has a boat-like shape and is situated on the thumb side of the wrist. This bone articulates with several other bones to provide support and ease of movement to the hand. It is noteworthy for its unique blood supply, which contributes to its healing process and vulnerability to fractures.

Terminologia Anatomica

os scaphoideum

System

Skeletal system

Function

The primary function of the scaphoid bone is to facilitate wrist motion and support load distribution during activities involving the hand. By articulating with the radius and several other carpal bones, it allows for a wide range of wrist movements, including flexion, extension, radial deviation, and ulnar deviation. Its position within the carpal arch also contributes to overall stability in the wrist joint, ensuring that movements of the hand are both strong and coordinated. Moreover, the scaphoid serves as a pivot point that enables the thumb to perform complex tasks, enhancing grip strength and finger dexterity.

Location

The scaphoid bone is located on the lateral aspect (thumb side) of the wrist, sandwiched between the radius and the proximal row of carpal bones. It sits just distal to the radius, at the proximal group of carpals, and is positioned next to the lunate and trapezium bones. A notable feature of its location is its relatively deeper position, which makes it critical for connecting the forearm to the hand effectively. Its anatomical position allows it to play a significant role in the wrist's structural integrity, especially during flexion and extension movements.

Did You Know?

The scaphoid is the most commonly fractured carpal bone, often due to falls on an outstretched hand.
It has a unique blood supply that enters through its distal pole, leaving the proximal part more susceptible to avascular necrosis if fractured.
Despite its small size, the scaphoid plays a critical role in the proper functioning of the thumb, one of the most important digits for grip and manipulation.