Scaphoid bone

Scaphoid bone

The Scaphoid bone is one of the eight carpal bones of the wrist. It is situated between the hand and forearm on the thumb side of the wrist (also known as the lateral side). It is recognizable by its large size and cashew-like shape. The scaphoid bone is the most commonly fractured carpal bone, accounting for almost 70% of all carpal fractures.

Anatomy

The scaphoid bone is located on the thumb side of the wrist, in the area known as the carpal tunnel. It is the largest bone in the carpal tunnel. The bone has two poles (a proximal and a distal pole) and a waist. The proximal pole is round and forms part of the wrist joint. The distal pole is flat and forms part of the hand. The waist is the narrowest part of the bone and is often the site of fractures.

Function

The scaphoid bone plays a crucial role in the function of the wrist and hand. It serves as a link between the two rows of carpal bones, and therefore helps with wrist movement. It also forms part of the radial (thumb) side of the carpal tunnel, which houses the tendons and nerves that supply the hand.

Clinical significance

The scaphoid bone is the most commonly fractured carpal bone, typically caused by a fall onto an outstretched hand. Because of its unique shape and location, fractures of the scaphoid are often difficult to diagnose and treat. Complications can include nonunion (failure of the bone to heal), avascular necrosis (death of bone tissue due to a lack of blood supply), and arthritis.

See also

• Carpal bones
• Wrist
• Hand
• Forearm

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