**Core Concept**
Von-Rosen splint is a type of orthopedic device used to immobilize and manage certain types of fractures, particularly those involving the proximal femur, such as intertrochanteric fractures. It is designed to provide stability and promote healing while minimizing the risk of complications.

**Why the Correct Answer is Right**
The Von-Rosen splint is specifically used in the management of intertrochanteric fractures, which occur in the proximal femur. This type of fracture involves a break in the bone between the greater and lesser trochanters, and the splint is designed to provide the necessary support and stability to facilitate healing. The splint works by distributing the forces across the fracture site, allowing the bone to heal while minimizing the risk of displacement or further injury.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the Von-Rosen splint is not typically used for managing fractures of the distal femur, which occur in the lower part of the femur.
* **Option B:** This option is incorrect because the Von-Rosen splint is not used for managing fractures of the humerus, which occurs in the upper arm bone.
* **Option C:** This option is incorrect because the Von-Rosen splint is not used for managing fractures of the tibia or fibula, which occur in the lower leg.

**Clinical Pearl / High-Yield Fact**
The Von-Rosen splint is a classic example of a orthopedic device used in the management of fractures, and its application is specific to certain types of fractures. It is essential for medical professionals to be aware of the indications and contraindications for this device to provide optimal patient care.

**Correct Answer:** D