• C A Logroscino, F C Tamburrelli, L Scaramuzzo, G R Schirò, S Sessa, and L Proietti.
• Department of Orthopedic Science and Traumatology Spine Surgery Division, Catholic University Rome, Largo A Gemelli 1, 00168 Rome, Italy.
• Eur Spine J. 2012 May 1;21 Suppl 1:S128-33.

PurposeThe aim of the study was to evaluate clinical and radiographic outcome of patients treated with a modified Grob technique analysing the advantages related to increased mechanical stability.Methods30 patients that underwent "in situ" fusion for L5-S1 spondylolisthesis were evaluated. All patients presented a low-dysplastic developmental L5-S1 spondylolisthesis. Patients were divided into two groups: A, in which L5-S1 pedicle instrumentation associated with transsacral screw fixation was performed, and B, in which L5-S1 pedicle instrumentation associated with a posterolateral interbody fusion (PLIF) was performed.ResultsPatients treated with transdiscal L5-S1 fixation observed a faster resolution of the symptoms and a more rapid return to daily activities, especially at 3-6 months' follow-up. The technique is reliable in giving an optimal mechanical stability to obtain a solid fusion.ConclusionsThe advantages of this technique are lower incidence of neurologic complications, speed of execution and faster return to normal life.

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