![]() ![]() An x-ray of the wrist will detect the fracture – though not always immediately after the break. When a fracture occurs, pain and tenderness is experienced on the thumb side of the wrist, motion is painful, swelling may be evident on the back and thumb side of the wrist and dull ache my occur periodically. Men are much more likely to fracture this bone than a woman, because of the forceful activities in which they are often involved and weight ultimately falling or pushing against joint. Generally injury occurs when the wrist joint of an outstretched hand hyperextends. Sometimes when a scaphoid bone breaks and loses connection with its blood supply, it experiences avascular necrosis – which may cause the bone to crumble and the wrist joint to be destroyed. This creates a problem, because the blood supply cannot reach the injury in order to facilitate adequate healing. The blood supply for a scaphoid bone enters from the top, though most fractures occur in the middle or lower portion of the bone. The unique thing about the scaphoid bone is its blood supply. Eighty percent of the surface is covered by articular cartilage, and it functions much like a ball bearing in the wrist joint. The scaphoid bone is shaped like a cashew and is located on the thumb side of the wrist, near the lower arm bones. Twice as much force is required to break the scaphoid bone than one of the bigger forearm bones. ![]() While the scaphoid is the most frequently injured carpal bone – accounting for nearly 60 percent of all wrist (carpal) fractures – it is a difficult bone to break and is therefore most often the result of a strong force as in sports (football, basketball, motorcycle racing), or an automobile accident. It is also known as the navicular bone (though this name is most commonly used today to describe a bone in the foot). A scaphoid fracture is a break in the small bone in the wrist joint called the scaphoid. ![]()
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