S1 Pedicle Subtraction Osteotomy for Fixed Sagittal Imbalance and Lumbosacral KyphosisBronson, Wesley H. MD, MSB; Dai, Amos BS; Protopsaltis, Themistocles MDClinical Spine Surgery: July 2019 - Volume 32 - Issue 6 - p 233–236 doi: 10.1097/BSD.0000000000000752 SURGICAL TECHNIQUE Buy SDC Abstract Author InformationAuthors Article MetricsMetrics S1 pedicle subtraction osteotomies (PSOs) are indicated in patients with fixed, high-grade L5–S1 spondylolisthesis or kyphosis secondary to a sacral fracture, who present with severe sagittal imbalance. Unlike lumbar PSOs, sacral osteotomies are rare, and there is a paucity of literature outlining techniques. Here, we present the indications, planning, technique, and outcomes for S1 PSOs. Department of Orthopaedic Surgery, New York University Hospital for Joint Diseases, New York, NY The authors declare no conflict of interest. Reprints: Wesley H. Bronson, MD, MSB, Department of Orthopaedic Surgery, New York University Hospital for Joint Diseases, 301 E 17th Street, New York, NY 10003 (e-mail: firstname.lastname@example.org). Received July 18, 2018 Accepted October 24, 2018 © 2019 by Lippincott Williams & Wilkins, Inc.