Wrist X-ray is given below. What is the probable diagnosis:
**Core Concept**
The given wrist X-ray is likely showing a condition characterized by abnormal bone formation, which leads to the disruption of normal wrist anatomy and function. This condition often results from a traumatic injury or a congenital malformation.
**Why the Correct Answer is Right**
The probable diagnosis is a radial fracture, specifically a Colles' fracture. This type of fracture occurs when the distal radius bone in the forearm breaks. The mechanism of injury typically involves a fall onto an outstretched hand, which leads to the displacement of the fracture fragments. The X-ray shows a characteristic "dinner fork" deformity, with the distal fragment displaced dorsally. The fracture may also involve the distal radioulnar joint, leading to instability and potential for complications.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because a scaphoid fracture, although a common wrist injury, typically presents with a different appearance on X-ray, often showing a "hanging fragment" sign. The scaphoid bone is also more commonly injured in a fall onto an outstretched hand.
* **Option B:** This option is incorrect because a distal radius fracture, while similar to a Colles' fracture, typically involves a more complex pattern of bone displacement and may not present with the characteristic "dinner fork" deformity.
* **Option C:** This option is incorrect because a scapholunate ligament injury, although a common cause of wrist pain and instability, would not be visible on a plain X-ray and would not result in the characteristic bone displacement seen in a Colles' fracture.
**Clinical Pearl / High-Yield Fact**
The "dinner fork" deformity is a classic radiographic sign of a Colles' fracture, but it is essential to also consider the patient's clinical presentation, including the mechanism of injury and the presence of any other wrist injuries.
**Correct Answer:** C.