Unidentified form of osteomyelitis in the knee joint. Possibly tuberculosis or some other chronic granulomatous infection. Granulomas have a central area of infectious material surrounded by macrophages and connective tissue. They occur when the immune system cannot completely destroy the infection.

Unidentified form of osteomyelitis in the knee joint. Possibly tuberculosis or some other chronic granulomatous infection. Granulomas have a central area of infectious material surrounded by macrophages and connective tissue. They occur when the immune system cannot completely destroy the infection.