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Until recently in the field of vertebral surgery, many diseases were managed with surgery of instrumented vertebral stabilization and bone fusion (arthrodesis). Fusion always offered valid and safe results, although at the expense of the abolition of the motility of the spine section which was being operated upon For this reason, when treating degenerative diseases of the lumbosacral spine, the Orthopaedic Clinic of the S. Chiara Hospital in Pisa, introduced the Dynesys® lumbosacral spine dynamic neutralization system to treat patients and spinal diseases with selected indications. Dynesys is a non-fusion elastic system with transpedicular screws and a flexible connector for dynamic stabilization. This is a new method for treating the degenerative disease of the lumbosacral spine which preserves motility at the treated levels. While allowing for movement of the segment at all levels, the Dynesys provides stability to the functional unit, which attains a condition of physiological function compared with the rigid stabilization-arthrodesis.