## **Core Concept**
An aeroplane splint, also known as a Thomas splint or a traction splint, is an orthopedic device used to stabilize and immobilize fractures, particularly those of the femur. The primary goal of using such a splint is to provide support, reduce pain, and prevent further injury to the affected limb.

## **Why the Correct Answer is Right**
The aeroplane splint is specifically designed to treat fractures of the shaft of the femur. It works by encircling the pelvis and providing traction to the affected limb, which helps in aligning the bone fragments and reducing pain. This type of splint is crucial in the management of femoral shaft fractures, especially in emergency settings or prior to surgical intervention.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because aeroplane splints are not typically used for fractures of the upper limb.
- **Option B:** This option is incorrect as aeroplane splints are not primarily used for fractures of the spine; they are used for lower limb fractures.
- **Option C:** This option might seem plausible but is incorrect because while immobilization is a part of the function, the specificity to "fractures of the tibia" is not accurate; aeroplane splints are more specifically used for femoral fractures.
- **Option D:** This option is not provided, but based on the correct answer given, we can infer that the correct use of an aeroplane splint is related to femoral fractures.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the aeroplane splint is particularly useful in the field or emergency setting for stabilizing femoral fractures, reducing pain, and preventing further injury. It's essential to understand that while it provides immobilization and traction, it is not a substitute for surgical stabilization in many cases.

## **Correct Answer:** C. Femoral shaft fractures.