However, the changes to disks related to wear and tear, and aging can also impact on the stability of the spinal column. The increased movement of the individual vertebral segments results in an increased load on the bony parts which causes them to grow and become deformed (spondylosis, spondylarthrosis, or degenerative scoliosis). This can in turn lead to constrictions of the spinal canal known as spinal canal stenosis. Constriction of the supply blood vessels is generally also associated with the condition and this can result in a range of different complaints that develop over time. Symptoms may develop to a greater or lesser degree and can range from back pain, through pain in the legs or arms, muscle tension, to disturbances of the bladder or rectum (incontinence), and/or restrictions of sexual function.