Tyson Ritter hit YouTube to explain his recent illness (Warning: some of the language is inappropriate for young children). He says that he had an infection in his knee, and that the infection had spread to his bloodstream. He was hospitalized for intravenous antibiotics for 5 days, which he continues to receive at home through a central IV line inserted in the hospital. He denied that drugs were involved, and that his gaunt appearance is due to a 10 pound weight loss during his illness.
Medically, an inflammation in the knee (or any other joint) caused by a germ (bacteria) is called septic arthritis. The knee is the most common joint affected. Septic arthritis is caused in one of three ways:
The most common bacterium involved is called Staphylococcus aureus. The symptoms include fever, and a joint that is red, warm, swollen, tender and has limited mobility. Treatment is with antibiotics, usually intravenously. Without treatment, there can be permanent damage to the joint.
For more information: