A 38-year-old man from rural Maharashtra presents with a 6-month history of progressive back pain and low-grade fever. On examination, he has kyphotic deformity of the thoracic spine and paravertebral muscle spasm. Plain radiographs show anterior vertebral body erosion at T5–T6 with collapse of T5, and MRI reveals heterogeneous signal intensity in the vertebral bodies with epidural extension compressing the spinal cord. ESR is 78 mm/h and tuberculin skin test is positive. What is the most appropriate next step in management?

Explanation

## Diagnosis & Pathophysiology **Key Point:** Pott disease (spinal tuberculosis) is the most common form of extrapulmonary TB, accounting for ~50% of skeletal TB cases. It typically affects the anterior vertebral bodies and intervertebral discs, leading to kyphotic deformity and potential neurological compromise. ## Clinical Presentation in This Case The patient demonstrates classic features: - Insidious onset (6 months) with constitutional symptoms (fever, weight loss implied) - Kyphotic deformity ("gibbus" — pathognomonic sign) - Anterior vertebral body erosion with collapse - Epidural involvement with cord compression - Positive tuberculin test and elevated ESR ## Management Algorithm ```mermaid flowchart TD A[Suspected Pott Disease]:::outcome --> B{Neurological deficit present?}:::decision B -->|No deficit| C[Anti-tuberculous therapy HRZE 2mo + HR 7mo]:::action B -->|Deficit present| D{Severe/progressive myelopathy?}:::decision D -->|Mild/stable| C D -->|Severe/progressive| E[ATT + Early surgical intervention]:::action C --> F[Monitor neurologically & radiologically]:::action E --> F F --> G[Assess response at 3-6 months]:::decision G -->|Good response| H[Continue ATT]:::action G -->|Deterioration| I[Surgical decompression/fusion]:::urgent ``` ## Why Medical Therapy First? **High-Yield:** The standard of care for Pott disease is **anti-tuberculous chemotherapy (ATT)** as first-line treatment, even with epidural involvement. The regimen is: - **Intensive phase:** HRZE (Isoniazid, Rifampicin, Pyrazinamide, Ethambutol) for 2 months - **Continuation phase:** HR for 7 months (total 9 months) **Clinical Pearl:** Medical therapy alone achieves healing in 80–90% of cases, even with cord compression, because: 1. TB causes inflammation and edema rather than mechanical obstruction in early disease 2. ATT reduces inflammation, allowing cord decompression 3. Vertebral bodies remodel and stabilize over 12–24 months ## Indications for Surgery Surgery is reserved for: - **Severe/progressive neurological deficit** despite 3–6 weeks of ATT - **Instability** with severe kyphosis (>60°) or subluxation - **Failure of medical therapy** (persistent pain, progressive deformity) - **Abscess** causing acute cord compression (rare) This patient has epidural involvement but no mention of acute neurological deterioration, so medical therapy with close monitoring is appropriate. ## Monitoring During ATT **Key Point:** Serial neurological examination and imaging (MRI at 3–6 months) are essential to detect deterioration early and trigger surgical intervention if needed. [cite:Robbins 10e Ch 8; Campbell's Operative Orthopaedics 13e Ch 42]