Abstract
Tuberculous sacro-iliitis occurs in fewer than 10% of cases of skeletal tuberculosis. The diagnosis is usually delayed as more common causes of low back pain are sought. Treatment is mainly conservative, with very few patients requiring surgery.
In a retrospective analysis from 1994 to 2004, we reviewed 15 patients, ranging in age from 15 to 60 years, 13 of whom presented with lower back pain and difficulty with walking. Two patients had an abscess over the affected sacro-iliac joint. All patients had tenderness over the sacro-iliac joint. The Gaenslen and FABER stress tests were positive in all patients. Radiographs showed joint space widening, marginal sclerosis of the joints and peri-articular osteopoenia. Technetium 99 bone scan revealed increased uptake in the region of the sacro-iliac joint. CT scan revealed joint space widening, sclerosis and sequestra in the joint space. Only one patient had bilateral tuberculous infection. Two had had an associated lumbar spine lesion. All 15 patients underwent open biopsy. Histological and microbiological reports revealed chronic infection, with Mycobacterium tuberculosis the causative organism. An 18-month program of antituberculous medication was initiated. Ambulation followed wound healing. Follow-up ranged from 5 to 8 years. All 15 patients responded well to this conservative approach.
In patients with low back pain, sacro-iliac disease should always be included in the differential diagnosis. Thorough clinical and radiological examination and laboratory diagnosis is essential to exclude pyogenic infection and tumours.
Secretary: Dr H.J.S. Colyn, Editor: Professor M.B.E. Sweet. Correspondence should be addressed to SAOA, Box 47363, Parklands, Johannesburg, 2121, South Africa.
