X-ray of the left<unk>  of a ten-year-old boy with polydactyly. A number of genetic disorders affect the<unk> . Polydactyly is the presence of more than the usual number of fingers. One of the disorders that can cause this is Catel-Manzke syndrome. The fingers may be fused in a disorder known as syndactyly. Or there may be an absence of one or more central fingers—a condition known as ectrodactyly. Additionally, some people are born without one or both<unk> s (amelia). Hereditary multiple exostoses of the forearm—also known as hereditary multiple osteochondromas—is another cause of<unk>  and forearm deformity in children and adults. There are several cutaneous conditions that can affect the<unk>  including the nails. The autoimmune disease rheumatoid arthritis can affect the<unk> , particularly the joints of the fingers. Some conditions can be treated by<unk>  surgery. These include carpal tunnel syndrome, a painful condition of the<unk>  and fingers caused by compression of the median nerve, and Dupuytren's contracture, a condition in which fingers bend towards the palm and cannot be straightened. Similarly, injury to the ulnar nerve may result in a condition in which some of the fingers cannot be flexed. A common fracture of the<unk>  is a scaphoid fracture—a fracture of the scaphoid bone, one of the carpal bones. This is the commonest carpal bone fracture and can be slow to heal due to a limited blood flow to the bone. There are various types of fracture to the base of the thumb; these are known as Rolando fractures, Bennet's fracture, and Gamekeeper's thumb. Another common fracture, known as Boxer's fracture, is to the neck of a metacarpal. One can also have a broken finger.
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