1. Aota Y, Kumano K, Hirabayashi S (1995) Postfusion instability at the adjacent segments after rigid pedicle screw fixation for degenerative lumbar disorders. J Spinal Diord 8: 464–73
2. Beckers L, Briddwell J (1991) The role of lordosis. Acta orthop Belg 57: 198–202
3. Casey MP, Asher MA, Jacob RR, Orrick JM (1987) The effect of Harrington rod contouring on lumbar lordosis. Spine 12: 750–753
4. Davies AG, McMaster MJ (1992) The effect of Luque-rod instrumentation on sagittal contour of the lumbosacral spine in adolescent idiopathic scoliosis and the preservation of a physiologic lumbar lordosis. Spine 17: 112–115
5. Edwards CC, Levine AM (1989) Complications associated with posterior instrumentation in the treatment of thoracic and lumbar injuries, complications of spine surgery. Baltimore: Williams and Wilkins, 164–199