Which of the following types of fractures involves the bone breaking into multiple pieces?

: Stress fractures are small, hairline cracks in the bone that occur due to repetitive stress or overuse. They typically present with a gradual onset of localized pain that worsens with activity.

a. Severe pain and deformity: Severe pain and deformity are more commonly seen in acute fractures resulting from trauma or high-impact injuries, not stress fractures.
b. Sudden onset of swelling and bruising: Sudden onset of swelling and bruising is more indicative of acute fractures, not stress fractures.
d. Inability to bear weight on the affected limb: Inability to bear weight may be present in some fractures, but it is not a specific characteristic of stress fractures.

A greenstick fracture involves the bone bending and partially breaking, with one side of the bone being broken and the other side bent.

b. Transverse fracture: A transverse fracture occurs when the bone breaks straight across its long axis, not involving bending.
c. Oblique fracture: An oblique fracture involves a diagonal break, not breaking on one side and bending on the other.
d. Stress fracture: A stress fracture occurs due to repetitive stress on the bone, not involving one side breaking and the other side bending.