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From Wikipedia, the free encyclopedia. A scaphoid fracture, a fracture of the scaphoid bone also known as the carpal navicular, is the most common type of carpal bone fracture. Scaphoid fractures usually cause pain at the base of the thumb accompanied by swelling in the same area.
The metacarpal bone is divided into regions: the head, neck, shaft and base. It can break in each of these regions. A break in the metacarpal neck is the most common, but a metacarpal shaft fracture is also pretty common. A head fracture is less common, and doctors worry about injury to the cartilage within the knuckle when they see this.