Septic Arthritis
Septic arthritis is an infection in a joint. The infection can be caused by bacteria, viruses, fungi, or parasites. Joint infection caused by fungi or parasites is much less common than that caused by bacteria or viruses. Typically, septic arthritis affects a single large joint, such as the knee or hip, but it is possible for several joints to be infected.

Septic arthritis is also referred to as infectious arthritis. Septic arthritis is considered a medical emergency because of the serious damage that can occur to bone and cartilage. Septic arthritis can cause septic shock, which can be fatal.