**Question:** In fracture of upper 1/3 of forearm, it is immobilized in:

**Core Concept:** Upper 1/3 of forearm refers to the portion of the forearm from the elbow to the wrist, which contains the radius and ulna bones. Immobilization is a crucial component in the treatment of fractures, as it helps to prevent further displacement and promote proper healing. Different fracture locations require specific immobilization methods to ensure accurate reduction and optimal healing outcomes.

**Why the Correct Answer is Right:**

The correct answer is **D.** Plaster Splint (Thompson's splint) is the most appropriate method for immobilizing fractures in the upper 1/3 of the forearm, which includes the radial and ulnar shaft fractures. Thompson's splint involves wrapping a plaster cast around the forearm, starting from the olecranon process and extending to the wrist. This splint maintains the reduction of the fracture and provides stability to the affected limb.

**Why Each Wrong Option is Incorrect:**

A. Plaster Cast (Holmes' splint) is employed for lower 1/3 forearm fractures, which are different from upper 1/3 fractures in terms of anatomical location and treatment requirements.

B. Slab is used for long bone fractures, not specifically for forearm fractures. The Thompson's splint is more suitable for forearm fractures.

C. Collar and Cuff (Harrison's splint) is typically used for fractures of the humerus, not the forearm bones.

**Clinical Pearl:** The Thompson's splint is a crucial method for immobilizing upper 1/3 forearm fractures, ensuring proper reduction and stabilization of the affected limb during the healing process. This method allows for the maintenance of joint mobility and prevents complications such as malunion and nonunion. Familiarizing yourself with the correct splinting techniques for different fracture locations is essential for ensuring optimal patient care and treatment outcomes.