What specific abnormalities are seen?
Hand: The entire hand may be affected. The thumb can be affected and the webspace between the thumb and the index finger is often narrowed. The hand can have syndactyly between other digits. In more severe cases, a variable number of digits may be absent. There can abnormal bony connections between the bones of the wrist and/ or bones of the hand (typically, the metacarpals). Forearm: The ulna is most commonly short. It can be absent. The radius bone may be affected as well but usually is normal. Sometimes the radius is fused to the humerus (radioulnar synostosis).