In colles fracture not seen is:
**Core Concept:** Colles' fracture is a common distal radius fracture, typically resulting from a fall onto an outstretched hand. The fracture occurs at the distal end of the radius, causing a dislocation of the distal radioulnar joint. The fracture is named after Sir Archibald Colles, who first described the injury in 1814.
**Why the Correct Answer is Right:** Colles' fracture is typically associated with a fracture of the distal radius with a dislocation of the distal radioulnar joint. In this type of fracture, the fracture line is directed dorsally, and the ulna is displaced distally and volarly. This results in a characteristic deformity, known as the "step deformity," where the ulna stands erect and the radius is bent ventrally.
**Why Each Wrong Option is Incorrect:**
A. **Distal Radial Fracture (DRF)** is a different type of fracture involving the distal radius. In DRF, the fracture line is directed dorsally, ventrally, or radially. DRF does not involve the dislocation of the distal radioulnar joint, making it irrelevant in this context.
B. **Distal Ulnar Fracture (DUF)** is a different type of fracture involving the distal ulna. DUF does not result in the characteristic "step deformity" observed in Colles' fracture.
C. An **Intact Distal Radioulnar Joint** is not seen in Colles' fracture as it is dislocated due to the fracture. In a normal wrist, the radioulnar joint should be intact, with no deformity or dislocation.
D. A **Normal Anatomy of the Wrist** is not seen in Colles' fracture as the fracture and dislocation lead to a characteristic deformity and distortion of the wrist.
**Clinical Pearl:** Colles' fracture is an important clinical diagnosis to recognize because it represents a specific pattern of fracture and dislocation, which can significantly affect wrist function and stability. Timely reduction and fixation are essential for optimal outcomes.
**Correct Answer:** C. An **Intact Distal Radioulnar Joint** is not seen in Colles' fracture as it is dislocated due to the fracture. In a normal wrist, the radioulnar joint should be intact, with no deformity or dislocation. Colles' fracture disrupts the integrity of the wrist joint, resulting in a characteristic deformity and altered joint motion.