**Colles Fracture**
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**Core Concept**
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A Colles fracture is a type of fracture at the distal end of the radius bone in the forearm, typically occurring when a person falls on an outstretched hand. It is characterized by a displacement of the bone fragments, resulting in a characteristic "dinner fork" deformity.

**Why the Correct Answer is Right**
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The correct answer is likely to be a characteristic or complication not seen in Colles fractures. A key feature of Colles fractures is the dorsal angulation of the distal fragment, which can lead to a loss of wrist extension and a characteristic deformity. However, one characteristic not typically seen in Colles fractures is a volar (palmar) displacement of the distal fragment, which would suggest a different type of fracture, such as a Smith's fracture.

**Why Each Wrong Option is Incorrect**
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* **Option A:** This option is likely incorrect as Colles fractures do typically involve a displacement of the distal fragment, which can be either dorsal or volar, but the characteristic dorsal angulation is more common.
* **Option B:** This option may be incorrect as the "dinner fork" deformity is a classic feature of Colles fractures, but it is not the only possible complication.
* **Option C:** This option is likely incorrect as the characteristic displacement of the distal fragment in Colles fractures is typically dorsal, not volar.
* **Option D:** This option may be incorrect as the loss of wrist extension is a common complication of Colles fractures, but it is not the only possible complication.

**Clinical Pearl / High-Yield Fact**
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A classic exam question on Colles fractures often involves differentiating between this fracture and a Smith's fracture, which is a volar (palmar) displacement of the distal fragment.

**Correct Answer:** C.