**Core Concept**
Trootter's triad is a clinical sign associated with femoral neck fractures, characterized by the combination of three specific symptoms. It is a crucial indicator for diagnosing hip fractures, particularly in elderly patients.

**Why the Correct Answer is Right**
Trootter's triad consists of three main components:
* **Pain** in the hip or groin area
* **Shortening** of the affected limb due to the displacement of the femoral head
* **External rotation** of the affected limb, resulting from the injury to the surrounding muscles and ligaments.

This triad is essential for healthcare providers to recognize, as it can help in early diagnosis and prompt treatment of femoral neck fractures, which can lead to complications such as avascular necrosis and long-term disability.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect because Trootter's triad does not typically include **swelling**, which is a common symptom in many types of injuries and conditions.

**Option B:**
This option is incorrect because **abduction** of the affected limb is not a characteristic feature of Trootter's triad.

**Option C:**
This option is incorrect because **internal rotation** of the affected limb is not a typical symptom of Trootter's triad.

**Clinical Pearl / High-Yield Fact**
To remember the components of Trootter's triad, use the mnemonic "Pain, Shortening, and Rotation" (PSR). This can help you recall the classic symptoms associated with femoral neck fractures.

**Correct Answer: C. Internal rotation**