The common causes of knee bone headaches are osteoarthritis, chondromalacia patella. Osteoporosis, bone fracture, etc. 1. Osteoarthritis: Osteoarthritis is due to the degeneration of the knee joint caused by the wear and tear of the articular cartilage, destruction of the subchondral bone, narrowing of the joint space, which will cause pain in the bones of the knee joint when moving, and sometimes accompanied by the swelling of the knee joint and activity limitation. 2. Chondromalacia patella: the articular cartilage of the patella is worn out. In the relative movement with the femur carriage, it will cause bone pain in the knee. It is especially obvious when going up and down stairs. 3. Osteoporosis: patients with osteoporosis, due to the decrease in bone density, often have generalized joint pains, and may have knee pain, ankle pain, and finger joint pain and other corresponding symptoms. 4. Fracture: Trauma to the knee joint may lead to fracture of the tibia or femur of the knee joint, and when the knee joint is pressed and moved, the bones of the knee joint will experience severe pain. If you have knee joint bone pain, you may also have knee bone tumor and rheumatoid arthritis and other diseases, you should go to the hospital in time for diagnosis and treatment, and do not deal with it on your own, so as not to delay the condition.