The largest joint in your body is the knee. It is a complicated joint consisting of ligaments, bone, and cartilage. The knee cartilage serves as a gliding surface and a cushion. The cartilage in the joint prevents the bones from rubbing against one another when it is healthy. However, when arthritis affects a joint, the bones rub against one another and hurt. The cartilage can deteriorate due to trauma, ageing, and degenerative disorders including arthritis.https://paincentre.in/knee-pain.html