• Cesare Faldini, Alberto Di Martino, Fabrizio Perna, Kostantinos Martikos, Tiziana Greggi, and Sandro Giannini.
• Department of General Orthopaedics, Department Rizzoli Sicilia, Istituto Ortopedico Rizzoli di Bologna, University of Bologna, Bologna, Italy.
• Eur Spine J. 2014 Oct 1; 23 Suppl 6: 714-9.

PurposeTo analyze changes in spino-pelvic parameters (SPPs) after surgery of high-grade lumbar isthmic spondylolisthesis (HDIS).MethodsWe analyzed 41 patients affected by HDIS operated upon by attempt of reduction and posterior spinal fusion with pedicle screw systems with or without interbody fusion. Pelvic tilt (PT), lumbar lordosis (LL), pelvic incidence (PI), and sacral slope (SS) were measured, and patients were further divided into balanced and unbalanced pelvis subgroups.ResultsSS passed from 46.8° ± 9.8° preoperatively to 50.1° ± 10.1° (p = 0.02). PT passed from 26.7° ± 6.7° preoperatively to 22.9° ± 7.5° (p = 0.003). Unbalanced patients showed significantly higher PT and lower SS compared to the balanced patients preoperatively, and these corrected after surgery. Patients with instrumentation failure (n = 5) had significant increase in PT values postoperatively (p = 0.018).ConclusionsWe confirmed the positive effect of surgery on the SPPs in patients affected by HDIS, which showed different patterns of corrections with surgery for balanced and unbalanced pelvis patients.

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