**Core Concept**
In Colles' fracture, a displaced distal radius fracture, the wrist is positioned in a specific anatomical alignment to stabilize the bone and prevent further displacement. The correct positioning ensures proper healing by aligning the radius with the ulna and maintaining functional wrist anatomy.

**Why the Correct Answer is Right**
Colles' fracture typically occurs due to a fall on an outstretched hand, resulting in dorsiflexion and radial deviation. The cast is applied with the wrist in **palmar flexion** (not dorsiflexion) and **pronation** to reduce the fracture, relieve pain, and maintain the alignment of the radius and ulna. This position helps prevent further displacement and supports the healing of the fracture by aligning the articular surface of the distal radius.

**Why Each Wrong Option is Incorrect**
Option B: Dorsal deviation and supination would exacerbate the displacement and increase joint instability, leading to poor healing and potential joint deformity.
Option C: Dorsal deviation and pronation is incorrect because dorsal positioning worsens radial displacement and misaligns the joint surface.
Option D: Supination with dorsal flexion is not standard and increases the risk of malunion and loss of wrist function.

**Clinical Pearl / High-Yield Fact**
Always position the wrist in **palmar flexion and pronation** in Colles' fracture casts — this is a key diagnostic and management clue to prevent malunion and ensure proper joint mechanics.

✓ Correct Answer: A. Palmar detion & pronation