The columna verıebralis performes the straight posture of the !ruıık. Alsa it ttaP.smits the weight of the body from the head to the pelvis, protects the spinal cord which is the part of the central nervous system and plays an imporıant role like to supporı the chest and abdominal organs. In our daily life compression, shearing, dist raction, bending and torsional forces effect the vertebral colon. But it performs the intrensic and extrensic stability. In order to unders tand the pathogenesis of low back pain, the diseases of the spinal calan and traumatology which are increasing all over the world, ıt is necessary to research the biomechanics of the spine.