Spinal Tuberculosis (Pott's Spine): Causes & Treatment

Spinal tuberculosis, also known as Pott’s spine, is a tuberculosis infection involving the vertebrae of the spine. It usually develops slowly and is treated mainly with a prolonged course of anti-tubercular drugs. Surgery is reserved for specific situations. This page explains the causes, symptoms, diagnosis and treatment of this condition.

What is spinal tuberculosis?

Spinal tuberculosis is infection of the spine by Mycobacterium tuberculosis, the bacterium that causes tuberculosis. It is the most common form of tuberculosis affecting the bones and joints. The infection usually reaches the spine through the bloodstream from another site, often the lungs.

The condition is also called Pott’s spine, Pott’s disease or tuberculous spondylitis. The infection typically begins in a vertebral body and can gradually destroy bone, spread to adjacent vertebrae, form collections of pus (abscesses), and in advanced cases cause deformity or press on the spinal cord. Because it develops slowly, diagnosis can be delayed, which is why awareness of its features is important.

Which parts of the spine are affected?

Spinal tuberculosis most commonly affects the thoracic (mid-back) and lumbar (lower back) regions, particularly the junction between them. The cervical (neck) and sacral regions can also be involved but less often.

The infection usually starts in the front part of a vertebral body and may spread under the ligaments to involve neighbouring vertebrae. As the front of the bones collapses, the spine can angulate forward, which is why thoracic involvement is associated with a sharp kyphotic (hunchback) deformity in advanced disease.

Causes and risk factors

The cause is infection with the tuberculosis bacterium, which typically travels to the spine from another focus in the body. Factors that increase the risk include:

• Exposure to tuberculosis, especially in regions where the disease is common.
• A weakened immune system, for example due to HIV, diabetes, malnutrition, or immunosuppressive treatment.
• Previous or current tuberculosis elsewhere, particularly in the lungs.
• Poor living conditions, crowding and limited access to healthcare.
• Extremes of age, with both children and older adults affected.

Symptoms and warning signs

Symptoms develop gradually and may be present for weeks or months before diagnosis. They commonly include:

• Persistent back pain, often localised to the affected area and not relieved by rest.
• Constitutional symptoms such as low-grade fever, night sweats, tiredness and loss of appetite.
• Unexplained weight loss.
• Stiffness of the spine and reluctance to move.
• A visible deformity, such as a localised bony prominence, in more advanced disease.

Red-flag warning signs that require prompt medical attention include weakness, numbness or tingling in the legs; difficulty walking or problems with balance; loss of bladder or bowel control; and a rapidly developing spinal deformity. These may indicate pressure on the spinal cord and need urgent assessment, as timely treatment offers the best chance of recovering nerve function.

How spinal tuberculosis is diagnosed

Diagnosis combines clinical assessment, imaging and, where possible, laboratory confirmation. After a history and examination, investigations may include:

• MRI, the most useful imaging test, which detects early changes in bone and soft tissue, shows abscesses, and reveals any compression of the spinal cord.
• X-rays, which show bone destruction, narrowing and deformity, although changes appear later than on MRI.
• CT, which provides detailed bone images and can guide a biopsy.
• Tissue or fluid sampling (biopsy), often image-guided, to confirm the diagnosis and test the organism’s sensitivity to drugs.
• Blood tests and tuberculosis-specific tests, together with a chest X-ray to look for lung involvement.

Confirming the diagnosis and checking drug sensitivity are important, both to ensure the right treatment and to identify any drug-resistant infection.

Non-surgical (drug) treatment

The mainstay of treatment is a prolonged course of anti-tubercular drugs. A combination of medicines is used over an extended period, with the exact regimen and duration determined by the treating clinician according to the individual case, the organism’s drug sensitivity and the response to treatment.

Key principles of medical treatment include:

1. Completing the full prescribed course, even after symptoms improve, to clear the infection and reduce the risk of relapse and drug resistance.
2. Regular monitoring of progress, the response of the infection, and any side effects of medication.
3. Supportive measures, which may include rest, bracing for spinal support in selected cases, pain relief and attention to nutrition and general health.
4. Managing associated conditions, such as diabetes or other causes of reduced immunity.

With appropriate and complete drug therapy, many people are cured without surgery.

When surgery is considered

Surgery is not required for most people and is reserved for specific indications. These typically include:

• Significant or progressive spinal deformity.
• Neurological deficit from compression of the spinal cord or nerves, such as limb weakness.
• Spinal instability due to extensive bone destruction.
• A large abscess that needs drainage.
• Failure of medical therapy, where the infection does not respond adequately to drugs.

Surgical procedures may aim to drain infection, remove destroyed tissue, decompress the spinal cord, and stabilise or correct the spine, often combined with continued drug treatment. The specific approach depends on the location and extent of disease and individual factors, and is decided by the treating team after weighing benefits and risks.

Recovery and outlook

With early diagnosis and a complete course of treatment, the outlook for spinal tuberculosis is often favourable, and many people recover well. Where nerve compression has caused weakness, timely treatment offers the best opportunity for neurological recovery, although the extent depends on the severity and duration of compression.

Treatment is prolonged and requires commitment to completing the full course and attending follow-up. Recovery and results depend on many individual factors, and this page provides general information rather than predicting the outcome for any one person.

When to see a spine specialist

Seek medical assessment for persistent back pain lasting more than a few weeks, especially when accompanied by fever, night sweats, weight loss or general ill health, or in anyone with a history of tuberculosis or a weakened immune system. Early evaluation supports earlier diagnosis and treatment.

Seek urgent care if you develop leg weakness or numbness, difficulty walking, loss of bladder or bowel control, or a rapidly worsening spinal deformity. These warning signs may reflect pressure on the spinal cord and require prompt specialist assessment.