[2] Symptoms include: This injury has also been reported in babies younger than six months and in older children up to the preteen years.

[citation needed] The distal attachment of the annular ligament covering the radial head is weaker in children than in adults, allowing it to be more easily torn.

The older child will usually point to the dorsal aspect of the proximal forearm when asked where it hurts.

In this movement the ulna, which is connected to the humerus by a simple hinge-joint, remains stationary, while the radius rotates, carrying the wrist and hand with it.

This is a circular ligamentous structure within which the radius is free, with constraints existing elsewhere in the forearm, to rotate.

With the passage of time the shape of this bone changes, becoming more cylindrical but with the proximal end being widened.

This causes significant pain, partial limitation of flexion/extension of the elbow and total loss of pronation/supination in the affected arm.

The situation is rare in adults, or in older children, because the changing shape of the radius associated with growth prevents it.