**Core Concept**
The concept of 3-point symmetry is crucial in orthopedic trauma, particularly in the assessment of fractures. It refers to the alignment of three points on either side of the midline of the body, which should be symmetrical in a normal individual. This concept is essential in evaluating the severity of fractures and the need for surgical intervention.

**Why the Correct Answer is Right**
The correct answer is a fracture that typically does not disrupt the 3-point symmetry, as it is a midline fracture that does not affect the alignment of the three points on either side of the midline. In the case of a fracture that occurs in the midline of the body, such as a fracture of the **pubic symphysis**, the 3-point symmetry is preserved because the fracture does not cause any lateral displacement of the fragments.

**Why Each Wrong Option is Incorrect**
* **Option A:** Fractures of the **femur** can disrupt 3-point symmetry, especially if they involve a significant displacement of the femoral shaft.
* **Option B:** Fractures of the **tibia** can also disrupt 3-point symmetry, particularly if they involve a significant displacement of the tibial shaft.
* **Option C:** Fractures of the **patella** can disrupt 3-point symmetry if they involve a significant displacement of the patellar fragment.

**Clinical Pearl / High-Yield Fact**
In orthopedic trauma, the preservation of 3-point symmetry is a key indicator of the severity of a fracture and the need for surgical intervention. A fracture that disrupts 3-point symmetry is more likely to require surgical reduction and stabilization to restore alignment and prevent complications.

**Correct Answer: D. Fracture of the pubic symphysis**