Treatment of Musculoskeletal Tuberculosis

Standard Treatment Regimen

The American College of Physicians and other medical societies recommend a standard 6-month regimen consisting of 2 months of isoniazid, rifampin, pyrazinamide, and ethambutol (HRZE) followed by 4 months of isoniazid and rifampin (HR) for musculoskeletal tuberculosis, which is the same regimen used for pulmonary TB 1
A four-drug regimen of isoniazid, rifampin, pyrazinamide, and ethambutol is used in the initial intensive phase, as recommended by the American Academy of Family Physicians and the American Thoracic Society 2, 3, 1
The dosing for the initial intensive phase is as follows: isoniazid 5 mg/kg (maximum 300 mg daily), rifampin 10 mg/kg (maximum 600 mg daily), pyrazinamide 35 mg/kg daily for patients <50 kg or 2.0 g daily for patients >50 kg, and ethambutol 15 mg/kg daily, according to the American College of Physicians 1
Ethambutol can be discontinued once drug susceptibility results confirm the organism is susceptible to both isoniazid and rifampin, as recommended by the American Thoracic Society and the Infectious Diseases Society of America 3, 4
A two-drug regimen of isoniazid and rifampin is used in the continuation phase, as recommended by the American Academy of Family Physicians and the American Thoracic Society 2, 3, 1

The standard 6-month regimen is effective for thoracic and lumbar spine disease, and ambulatory chemotherapy alone is highly effective for most cases of spinal TB, according to the American College of Physicians 1
Surgery is reserved only for spinal cord compression or spinal instability in cases of spinal TB, as recommended by the American College of Physicians 1

Drug susceptibility testing should be performed on all initial isolates, and the regimen should be modified appropriately once susceptibility results are available, as recommended by the American College of Physicians 1
Directly observed therapy (DOT) is strongly recommended for all TB patients to ensure treatment completion and prevent drug resistance, according to the American Thoracic Society and the Infectious Diseases Society of America 1, 4
Pyridoxine supplementation (25-50 mg daily) should be added to isoniazid for patients at risk of neuropathy, including pregnant women, breastfeeding infants, HIV-positive patients, and patients with diabetes or chronic renal failure, as recommended by the Infectious Diseases Society of America 4