Final answer:
A greenstick fracture is a partial fracture in which only one side of the bone is broken with one cortex buckled while the other side remains intact. It is common in children due to the flexibility of their bones. Such fractures cannot be simultaneously open and closed as those terms refer to skin involvement, not fracture pattern.
Step-by-step explanation:
A greenstick fracture is characterized by a crack on one side of the bone, which does not go all the way through to the other side. When one side is buckled and the other is intact, it is described as a greenstick fracture. This type of fracture is common in children, whose bones are more flexible compared to adults. When it comes to bone fractures, they can occur in various forms like transverse, comminuted, or a combination of different types. However, fractures such as open (where the bone breaks through the skin) and closed (where the skin remains intact) are not combined since they represent the fracture's status in relation to the skin, not the pattern of the break itself.