Ligaments are bands of tough, fibrous connective tissue that connect two or more bones together and help to stabilize and limit the range of motion of a joint. The joint capsule is a fibrous membrane that surrounds the joint and helps to keep it stable. It also contains ligaments, which help to stabilize the joint, and synovial fluid, which lubricates the joint and prevents friction. Together, the ligaments and capsule maintain the integrity of the joint and protect it from injury.