Infectional arthritis is a condition that is characterized by joint inflammation caused by an infection in the body. It can be caused by a variety of bacterial, viral, or fungal infections, and can often be difficult to treat. However, there are several synonyms for this condition, including septic arthritis, infectious arthritis, and pyogenic arthritis. These terms are often used interchangeably to refer to the same condition, and all describe joint inflammation caused by an infection. Doctors may use any of these terms when discussing the diagnosis and treatment of infectional arthritis in their patients.