**Question:** Complication of Colle's fracture include all of the following except:

A. Haematoma
B. Malunion
C. Non-union
D. Flexion deformity

**Core Concept:**
Colle's fracture is a fracture of the base of the proximal phalanx, typically caused by a direct blow to the finger, and commonly seen in sports like tennis and squash. The complications that can arise from this fracture include impaired healing, malalignment, and deformity.

**Why the Correct Answer is Right:**
The correct answer, **"Flexion deformity"**, does not specifically result from Colle's fracture but rather from a fracture that occurs at a different location and with different pathophysiology. Flexion deformity occurs when the fracture results in flexion of the finger joint, leading to a bent position of the finger. This can be a result of specific types of fractures, such as those involving the distal phalanx, where the fracture is closer to the tip of the finger. In Colle's fracture, the fracture occurs at the base of the proximal phalanx, which is farther from the tip of the finger.

**Why Each Wrong Option is Incorrect:**
A. "Haematoma" is an accumulation of blood outside the blood vessels, which can be a complication of any fracture, but it is not specific to Colle's fracture or its complications.
B. "Malunion" is a complication that occurs when the fracture does not heal properly, resulting in a fracture that is not aligned correctly. Malunion can occur with Colle's fracture, but flexion deformity is not a malunion complication.
C. "Non-union" is a complication where the fracture fails to heal, which can also be seen in Colle's fracture. However, flexion deformity is not related to this complication.

**Clinical Pearl:**
Flexion deformity is a potential complication of Colle's fracture, particularly when the fracture is not treated promptly or is not reduced correctly. It is essential for clinicians to recognize and address this complication promptly to ensure a successful fracture healing outcome and restore function of the affected finger.