Bone-on-bone knee pain, or osteoarthritis, commonly includes symptoms like swelling, a feeling of warmth in the joint, stiffness and sounds when moving the knee, according to WebMD. Additional symptoms can include pain that feels better with rest, bone spur development and decreased mobility that makes certain activities difficult.
Osteoarthritis occurs when the cartilage between the joints breaks down, which results in joints that rub together without the protective padding that cartilage naturally provides, states WebMD. Osteoarthritis is the most common type of arthritis in the United States, affecting approximately 27 million people. It can occur in both young people and older adults.