**Question:** Most common type of injury to spinal cord is -

A. Traumatic
B. Non-traumatic
C. Degenerative
D. Infective

**Correct Answer:** D. Infective

**Core Concept:**

Spinal cord injuries can be broadly categorized into four types: traumatic, non-traumatic, degenerative, and infectious. Traumatic injuries are caused by external factors like accidents or falls, and non-traumatic injuries result from internal factors such as tumors, infections, or vascular problems. Degenerative injuries are due to the natural aging process, while infectious injuries are caused by various pathogens, particularly bacteria and viruses. In this case, the correct answer is "infectious" (option D) because it focuses on the type of injury caused by infections, which are typically less common compared to traumatic, non-traumatic, and degenerative injuries.

**Why the Correct Answer is Right:**

Spinal cord infections, also known as meningitis, are uncommon but serious conditions that can lead to permanent neurological deficits if left untreated. They are caused by pathogens invading the spinal cord through the bloodstream or by direct extension from a contiguous infection, such as a lung or urinary tract infection. The spinal cord's vulnerability lies in its location, which makes it susceptible to infections. Furthermore, the blood-spinal cord barrier prevents many antibiotics from reaching the site of infection effectively.

**Why Each Wrong Option is Incorrect:**

A. Traumatic injuries are common, but the question asks for the most common type of injury, which is infectious.
B. Non-traumatic injuries encompass a broad range of causes, including tumors, vascular disorders, and degenerative diseases. However, the focus is on infectious injuries, making option D the correct answer.
C. Degenerative injuries are not considered the most common type of spinal cord injury, as they result from the aging process and are relatively rare compared to infectious, traumatic, and non-traumatic causes.

**Clinical Pearl:**

When assessing patients with suspected spinal cord injuries, it is essential to consider the possibility of an infectious etiology, especially in immunocompromised patients or those with predisposing factors such as HIV, diabetes, or malignancies. Prompt diagnosis and treatment are crucial to minimize neurological damage and improve outcomes. A high index of suspicion is necessary to avoid missing a potentially life-threatening infection.