Knuckle boom cranes are an amazing piece of engineering technology. Also called a loader crane, articulating crane, and a picker crane, the knuckle boom crane has changed the way people load and offload in a variety of industries. It looks similar to the traditional straight boom crane, but the knuckle boom crane has two booms; a main boom and an outer boom. These two booms have a knuckle between them, which allows more options for the loader crane operator