Which of the following injuries is known for not breaking the skin surface?

The correct choice is the simple fracture. A simple fracture, also known as a closed fracture, occurs when the bone breaks but the skin remains intact. This type of injury does not expose the broken bone or surrounding tissues to the external environment, therefore there is no open wound present on the skin surface.

This characteristic of a simple fracture is significant because it typically results in less risk of infection compared to injuries that break the skin. In contrast, a compound fracture involves the broken bone protruding through the skin, creating an open wound. Evisceration refers to the displacement of internal organs outside the body through a wound, which would certainly break the skin. Paradoxical chest movement is the term used to describe an abnormal movement pattern of the chest wall, often seen in cases of flail chest, and does not pertain to bone fractures or skin integrity directly. Hence, a simple fracture is notably defined by its non-penetrating nature regarding the skin.