Most common site of skeletal tuberculosis is
**Core Concept**
Skeletal tuberculosis is a form of extrapulmonary tuberculosis that affects the bones and joints. The most common sites of skeletal tuberculosis are typically weight-bearing joints and areas with high blood flow.
**Why the Correct Answer is Right**
The most common site of skeletal tuberculosis is the spine, accounting for approximately 50% of all cases. This is due to the spine's high blood flow and the fact that **Mycobacterium tuberculosis** can easily lodge in the vertebral bodies. The infection often starts in the anterior portion of the vertebral body and can spread to adjacent vertebrae.
**Why Each Wrong Option is Incorrect**
**Option A:** This is not the most common site, although tuberculosis can affect any bone or joint.
**Option B:** Similarly, this is not the most common site of skeletal tuberculosis.
**Option D:** This is also an incorrect option as it is not the most common site.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that spinal tuberculosis can lead to **gibbus deformity**, a form of kyphosis resulting from the collapse of vertebral bodies.
**Correct Answer:** D. Spine