DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Fractured hand. The swollen hand of an 18 year-old man who has fractured a metacarpal bone during a game of rugby. The metacarpals are five, long cylindrical bones within the body of the hand. The bones run from the base of each digit to the finger and are covered by thick connective tissue. The head of the metacarpal bones form the knuckles. Fracture of the metacarpal bones is common, usually resulting from a fall or a blow to the knuckles.
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