A 22-year-old woman sustained a chest injury upon impact with the steering wheel during a car crash. Upon admission of the patient to the hospital, physical examination revealed profuse swelling, inflammation, and deformation of the chest wall. A radiograph revealed an uncommon fracture of the manubrium at the sternomanubrial joint. Which of the following ribs would be most likely to also be involved in such an injury?

**Core Concept**
The sternomanubrial joint is a fibrocartilaginous joint located between the manubrium and the body of the sternum. Injuries to this region often involve the costal cartilages, which connect the ribs to the sternum. The mechanism of injury in this case is likely due to the forceful transmission of energy from the steering wheel to the chest wall, resulting in a fracture of the manubrium and potentially other nearby ribs.

**Why the Correct Answer is Right**
The correct answer is likely due to the fact that the 2nd rib is the first floating rib, which is not directly attached to the sternum. However, its costal cartilage is longer and more prone to injury in cases of chest trauma. Furthermore, the 2nd rib is often involved in sternal fractures due to its anatomical position and the distribution of force during impact.

**Why Each Wrong Option is Incorrect**
**Option A:** The 1st rib is not typically involved in sternal fractures due to its unique anatomy and the way forces are distributed during impact.
**Option B:** The 7th rib is a lower rib and is less likely to be involved in sternal fractures compared to the 2nd rib.
**Option C:** The 3rd rib is also a floating rib, but it is less commonly involved in sternal fractures compared to the 2nd rib.
**Option D:** The 10th rib is a lower rib and is not typically involved in sternal fractures.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that the 2nd rib is often involved in sternal fractures due to its unique anatomy and the distribution of force during impact. This is a classic exam trap, and students should be aware of this high-yield fact when encountering questions about chest trauma.

**Correct Answer:** C. The 2nd rib is the most likely to be involved in such an injury.

✓ Correct Answer: B. Second