The most common complication of clavicle fracture is
**Core Concept**
The most common complication of clavicle fractures is related to the anatomical structure and function of the clavicle, which is a long bone that connects the scapula to the sternum. The clavicle plays a crucial role in shoulder stability and movement, and fractures can lead to various complications.
**Why the Correct Answer is Right**
The most common complication of clavicle fractures is nonunion, which occurs due to the poor blood supply to the clavicle, particularly in the medial third. The clavicle has a unique blood supply, which is primarily derived from the medial and lateral circumflex humeral arteries. In the case of a fracture, the blood supply to the fracture site may be compromised, leading to delayed or impaired healing. This is more likely to occur in the medial third of the clavicle, where the blood supply is already limited.
**Why Each Wrong Option is Incorrect**
**Option A:** Malunion is a possible complication of clavicle fractures, but it is not the most common complication. Malunion occurs when the bone heals in an abnormal position, but it is less common than nonunion.
**Option B:** Nerve injury is a potential complication of clavicle fractures, particularly to the brachial plexus, but it is not the most common complication. Nerve injury can occur due to direct trauma to the nerve or due to compression or stretching of the nerve.
**Option C:** Infection is a possible complication of clavicle fractures, but it is not the most common complication. Infection can occur due to open fractures or poor wound care.
**Option D:** Arthritis is a possible long-term complication of clavicle fractures, but it is not the most common complication. Arthritis can occur due to chronic inflammation or joint instability.
**Clinical Pearl / High-Yield Fact**
The clavicle has a unique blood supply, which makes it prone to nonunion and delayed healing. This is an important consideration in the management of clavicle fractures, particularly in the medial third.
**Correct Answer:** A. Nonunion.