An infection caused by bacteria, a virus, or fungus inside the knee can cause inflammation, pain, swelling, and difficulty moving the knee. Although uncommon, septic arthritis is a serious condition that usually gets worse quickly without treatment.
- Hepatitis A, B, and C
- Parvovirus B19
- HIV (AIDS virus)
- Coxsackie viruses
- Fatigue and generalized weakness
- Inability to move the limb with the infected joint
- Severe pain in the affected joint, especially with movement
- Swelling (increased fluid within the joint)
- Warmth (the joint is red and warm to touch because of increased blood flow)
Septic arthritis treatments include using a combination of powerful antibiotics as well as draining the infected synovial fluid from the joint.