title: Trans-sacral screw fixation in the treatment of high dyplastic developmental spondylolisthesis.
abstract: We describe the case of a 67-year-old woman with L5-S1 ontogenetic spondylolisthesis treated with pedicle fixation associated with interbody arthrodesis performed with S1-L5 trans-sacral screwing according to the technique of Bartolozzi. The procedure was followed by a wide decompressive laminectomy. The patient had a progressive improvement of the symptoms which gradually disappeared in 12 mo. The radiograph at 6 and 12 mo showed complete fusion system. The choice of treatment in L5-S1 ontogenetic spondylolithesis is related to a correct clinical and diagnostic planning (X-ray, computer tomography magnetic resonance imaging, Measurement). In particular, the severity index and the square of unstable zone, and the standard measurements already described in the literature, are important to understand and to plane the correct surgical strategy, that require, in most of the times, fusion and interbody artrodesis.
authors.affiliation: Alessandro Landi, Nicola Marotta, Cristina Mancarella, Roberto Tarantino, Roberto Delfini, Department of Neurology and Psychiatry, Division of Neurosurgery, University of Rome "Sapienza", 00165 Rome, Italy.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Landi
authors.forename: Nicola
authors.initials: N
authors.lastname: Marotta
authors.forename: Cristina
authors.initials: C
authors.lastname: Mancarella
authors.forename: Roberto
authors.initials: R
authors.lastname: Tarantino
authors.forename: Roberto
authors.initials: R
authors.lastname: Delfini
keywords: High-dysplastic developmental spondylolisthesis; Pelvic balance; Spinopelvic imbalance; Spondylolisthesis; Trans-sacral screw