Disseminated tuberculosis following total knee arthroplasty in an HIV patient

Skeletal tuberculosis is now uncommon in developed countries. In immunocompromised patients - particularly in the HIV-infected - who present with subacute or chronic joint pain refractory to conventional treatment, osteoarticutar tuberculosis should still be included in the differential diagnosis. We report on a lethal case of disseminated tuberculosis in an HIV-infected subject. Dissemination may have resulted from the implantation of an articular prosthesis in a knee joint with unsuspected osteoarticutar tuberculosis. The diagnosis was established months later when the patient presented with far-advanced tuberculous meningitis, miliary tuberculosis of the lungs, femoral osteomyelitis and extended cold abscesses along the femoral shaft. Failure to respond to a conventional four-drug regimen is explained by the resistance pattern of his multi-drug resistant strain of Mycobacterium tuberculosis, which was only reported after the patient's death. This case illustrates the diagnostic challenges of osteoarticutar tuberculosis and the consequences of a diagnostic delay in an HIV-infected individual.