Bone spurs, also known as osteophytes or bone overgrowths, refer to the increase in trabecular bone and bone density at the edges of vertebrae, joints, joint surfaces, and bony prominences. Sometimes, because their growth shape resembles lips or a bird's beak, they are also called lip-like projections or bone spurs. Bone spurs mainly appear in weight-bearing joints, such as the edges of hip, knee, and spinal joints. For more detailed information on what exactly bone spurs are, please refer to other articles within this section.