This report describes a case of knee septic arthritis in a 69-year-old diabetic patient. Atthe time of admission he was receiving local treatment for a chronic skin ulcer in the same extremity andinespecific oral antibiotherapy because of an urinary tract infection. Synovial fluid cultures showed a Streptococcusagalactiae (group B streptococcus). The infection had no response to specific parenteral antibiotherapyand repeated joint irrigations-aspirations, and therefore surgical desbridement and synovectomy was required.Despite of an intensive rehabilitation program, the affected knee developed ankylosis. In a reviewof literature, it is remarkable the association between group B streptococcal arthritis and chronic skin ulcersin diabetic patients and the potential severity of these infections.

This report describes a case of knee septic arthritis in a 69-year-old diabetic patient. Atthe time of admission he was receiving local treatment for a chronic skin ulcer in the same extremity andinespecific oral antibiotherapy because of an urinary tract infection. Synovial fluid cultures showed a Streptococcusagalactiae (group B streptococcus). The infection had no response to specific parenteral antibiotherapyand repeated joint irrigations-aspirations, and therefore surgical desbridement and synovectomy was required.Despite of an intensive rehabilitation program, the affected knee developed ankylosis. In a reviewof literature, it is remarkable the association between group B streptococcal arthritis and chronic skin ulcersin diabetic patients and the potential severity of these infections.