Arthritis

Arthritis is a common condition that can affect any joint in the body, including the knee joint. Osteoarthritis, the most common form of arthritis, occurs when the protective cartilage that cushions the ends of the bones wears down over time, leading to pain, swelling, and stiffness. Arthritis in the knee can cause pain in various areas, including the back of the knee. This pain may be accompanied by limited range of motion, difficulty walking, and joint instability.