Severe cellulitis and septic arthritis due to Eikenella corrodens and a viridans group streptococcus developed following dental manipulation in a patient with a history of hemarthrosis. Correct diagnosis was achieved by recognition of E. corrodens on a culture of a knee aspirate. Antimicrobial (ampicillin) therapy resulted in a therapeutic response.

A 73-year-old diabetic presented with septic arthritis of the knee; Pseudomonas aeruginosa was isolated. She was successfully treated with a combination of parenteral and intra-articular ceftazidime, after failure to eradicate the organism with adequate serum levels of gentamicin and full doses of azlocillin.

Nocardia infection following anterior cruciate ligament (ACL) allograft reconstruction is a rare occurrence. We report a case of Nocardia infection of an allograft ACL reconstruction and septic arthritis of the knee joint due to an organism most similar to the novel Nocardia species Nocardia aobensis.

We report the first case of community-acquired bacteremia with Burkholderia fungorum, a newly described member of the Burkholderia cepacia complex. A 9-year-old girl sought treatment with septic arthritis in her right knee and ankle with soft tissue involvement. Commercial identification systems did not identify the causative microorganism.

Mycobacterium kansasii is a relatively common cause of nontuberculous mycobacterial pulmonary infection. Septic arthritis caused by Mycobacterium kansasii, on the other hand, is rare. Reported here for the first time is the case of an 82-year-old patient with an infection of a prosthetic knee joint with Mycobacterium kansasii.

We describe the third case of prosthetic infection due to Erysipelothrix rhusiopathiae. The patient, a 68-year-old woman, had had total knee arthroplasty 12 months before diagnosis. She had been in contact with swine at home. We review the seven previous reports of septic arthritis due to E. rhusiopathiae.

We describe a patient with systemic lupus erythematosus (SLE)-like disease on immunosuppressive treatment who developed septic arthritis of the knee involving Legionella dumoffii. Cultures initially remained negative. A broad-range 16S PCR using synovial fluid revealed L. dumoffii rRNA genes, a finding that was subsequently confirmed by positive Legionella culture results.

On the basis of primarily consensus due to lack of relevant clinical studies, the most important evaluative step for knee pain is to identify any emergent conditions, including limb- and life-threatening disorders (septic arthritis, osteomyelitis, and malignancy), hip pathology, or conditions associated with effusions. (2)(3)(6)(8)(11)(13)(14)

A case of septic arthritis of the knee caused by Pseudomonas cepacia following an intraarticular corticosteroid injection in a patient with a history of osteoarthritis is presented. This is the second report of this agent causing infection in a diarthrodial joint, which proved difficult to eradicate despite in vitro antibiotic sensitivity.

Calcification of the lateral collateral ligament is a rare phenomenon, which can cause acute knee pain. The management is usually conservative and there is subsequent resolution of the calcification seen on initial radiographs. It is important to exclude more sinister pathology such as septic arthritis as a cause of pain. We report the case of an elderly lady who presented with acute knee pain....