A most common complication of Colles
**Core Concept**
Colles' fracture is a type of fracture at the distal end of the radius bone in the forearm. It is a common injury that occurs when a person falls onto an outstretched hand, causing the bone to break. The complication we are focusing on is a potential consequence of this fracture.
**Why the Correct Answer is Right**
The most common complication of Colles' fracture is **malunion**. Malunion occurs when the bone heals in an abnormal position, leading to deformity and potential functional impairment. This is often due to improper alignment of the bone fragments during the healing process. The radius bone is responsible for forearm rotation, and malunion can lead to decreased mobility and strength in the affected arm.
**Why Each Wrong Option is Incorrect**
* **Option A:** **Nerve injury** is a possible complication of Colles' fracture, but it is not the most common one. Nerve damage can occur due to the fracture itself or during the healing process.
* **Option B:** **Infection** is a potential complication of any fracture, but it is relatively rare in Colles' fractures. Infection can occur if the wound becomes contaminated or if there is a delay in seeking medical attention.
* **Option C:** **Delayed union** is a potential complication of Colles' fracture, but it is not as common as malunion. Delayed union occurs when the bone takes longer than expected to heal.
**Clinical Pearl / High-Yield Fact**
A common mnemonic to remember the potential complications of Colles' fracture is "MAD": malunion, arthritis, and nerve damage.
**Correct Answer: C. Delayed union**