Commonest fracture in children:
**Core Concept**
Children's bones are highly resilient and have a unique characteristic called "plastic deformation," where they can bend and absorb energy without breaking. However, when a child's bone does fracture, it is often due to a sudden, high-impact force. The most common type of fracture in children is a result of this mechanism.
**Why the Correct Answer is Right**
The most common fracture in children is the **torus fracture** or "buckle fracture," which occurs when a bone bends and partially breaks. This type of fracture is typically seen in children's long bones, such as the forearm or humerus, and is often caused by a fall onto an outstretched hand. The bone's plastic deformation allows it to absorb the impact, but the force is still sufficient to cause a fracture.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because while the **clavicle** (collarbone) is a common site for fractures in children, it is not the most common type of fracture.
* **Option B:** This option is incorrect because **greenstick fractures** are a type of fracture that occurs in children, but they are not the most common type. Greenstick fractures occur when a bone partially breaks, but does not completely fracture.
* **Option C:** This option is incorrect because **scaphoid fractures** are more common in adults, particularly those who participate in sports that involve falling onto an outstretched hand.
**Clinical Pearl / High-Yield Fact**
Children's bones have a unique ability to heal rapidly and with minimal scarring due to their high rate of growth and cell division. This is why children's fractures often heal quickly and with minimal complications.
**Correct Answer: C.**