Analgesic Herbal Medicines in the Treatment of Knee Osteoarthritis: A Systematic Review.

Background: Osteoarthritis (OA) is a type of progressive rheumatoid disease, which leads to the degeneration of the articular cartilage, synovium, subchondral bone, tendons, and the surrounding ligaments.There are various treatments for knee OA, including pharmaceutical, nonpharmaceutical, and surgical treatments. Considering the chronic nature of the disease as well as the necessity for the long-term use of chemical medications, various side effects could occur that include gastrointestinal bleeding, hypertension, congestive heart failure, hyperkalemia, and kidney failure.