**Core Concept**
Incomplete fractures refer to a type of fracture where the bone is partially broken, but not completely. This occurs when the bone is subjected to a force that causes a crack or a partial break, but does not completely disrupt the bone structure.

**Why the Correct Answer is Right**
The correct answer is related to the concept of a fracture that is not completely broken. Incomplete fractures occur due to the bone's ability to absorb and distribute the force of the injury. The bone may bend or deform, but it does not completely break. This type of fracture is often seen in osteoporotic bones or in cases where the force of the injury is not sufficient to cause a complete break.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a recognized term for incomplete fractures.
**Option B:** This option is incorrect because it refers to a type of fracture where the bone is completely broken, but not displaced.
**Option C:** This option is incorrect because it refers to a type of fracture where the bone is completely broken and displaced.

**Clinical Pearl / High-Yield Fact**
Incomplete fractures can be challenging to diagnose, especially on X-ray, as they may not show up as a clear break. A thorough physical examination and sometimes additional imaging studies like CT scans or MRI may be necessary to confirm the diagnosis.

**Correct Answer: B. Stress fracture**