## Most Common Site of Pott Disease **Key Point:** The thoracic spine is the most frequently affected region in tuberculosis of the spine, accounting for approximately 40–50% of all cases. ### Distribution Pattern in Pott Disease | Spinal Region | Frequency | Characteristics | |---|---|---| | **Thoracic** | 40–50% | Most common; often mid-thoracic (T4–T8) | | **Lumbar** | 35–40% | Second most common; lower lumbar (L4–L5) | | **Cervical** | 10–15% | Less common; higher neurological risk | | **Sacral** | 5% | Rare; often missed on initial imaging | ### Pathophysiological Basis **High-Yield:** TB of the spine typically begins in the vertebral body near the endplate (metaphyseal region with rich vascular supply), not in the posterior elements. The thoracic spine's greater vascularity and larger vertebral bodies make it the preferred site for hematogenous seeding during primary TB dissemination. ### Clinical Implications **Clinical Pearl:** Thoracic involvement often presents with: - Progressive kyphotic deformity ("gibbus" deformity) - Higher risk of paravertebral abscess formation - Potential for spinal cord compression and paraplegia **Warning:** While lumbar involvement is nearly as common, the question asks for the single most common site—thoracic is the answer in standard epidemiological data. [cite:Campbell's Operative Orthopaedics 13e Ch 38]
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