**Question:** Long compression is used for which fracture -

A. Distal radius fracture
B. Colles' fracture
C. Metacarpal shaft fracture
D. Proximal humerus fracture

**Correct Answer:** C. Metacarpal shaft fracture

**Core Concept:** Long compression splint is a type of fracture immobilization technique used to stabilize fractures involving long bones with a cylindrical shaft, typically found in the upper or lower extremities. These fractures are characterized by compression forces that result in buckling or shortening of the bone.

**Why the Correct Answer is Right:** A long compression splint is suitable for treating metacarpal shaft fractures, also known as Colles' fracture. In these fractures, the metacarpal bone experiences compression forces, causing it to buckle and result in shortening. The splint helps to stabilize the fracture site and prevent further damage to the bone until it can be properly treated.

**Why Each Wrong Option is Incorrect:**

A. Distal radius fracture (Option A) is not typically treated with a long compression splint, as it involves the distal end of the radius and is usually managed using a short-arm cast or a plaster splint.

B. Colles' fracture (Option B) is not the correct answer, as it involves the distal end of the radius, not the metacarpal shaft. A Colles' fracture is typically managed using a short-arm cast or plaster splint.

D. Proximal humerus fracture (Option D) is not suitable for long compression splint application, as proximal humerus fractures involve the upper arm bone (humerus) and are typically managed with a functional sling or a short-arm cast.

**Clinical Pearl:** Long compression splints are commonly used in clinical practice for fractures involving long bones with cylindrical shafts, such as metacarpal shaft fractures. These splints provide stability and immobilization while allowing for limited mobility and weight-bearing, promoting fracture healing and preventing further injury.