Michael D Daubs1, Harsimran S Brara2, Laura B Raaen3, Peggy Guey-Chi Chen3, Ashaunta T Anderson3, Steven M Asch4, Teryl K Nuckols5. 1. UNLV Department of Orthopaedic Surgery, UNLV School of Medicine. Las Vegas, NV 89102, USA. 2. Neurological Surgery, Kaiser Permanente Southern California, Los Angeles, CA 90027, USA. 3. RAND Corporation, 1776 Main Street, Santa Monica, CA 90407, USA. 4. Center for Healthcare Evaluation, VA Palo Alto Health Care System, 795 Willow Rd, Menlo Park, CA 94025, USA; Medicine/Primary Care and Population Health, Stanford University, 1265 Welch Rd, Palo Alto, CA 94305, USA. 5. RAND Corporation, 1776 Main Street, Santa Monica, CA 90407, USA; Division of General Internal Medicine, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Becker 113, Los Angeles, CA 90048, USA. Electronic address: teryl@rand.org.
Abstract
BACKGROUND CONTEXT: Degenerative lumbar scoliosis (DLS) is often associated with sagittal imbalance, which may affect patients' health outcomes before and after surgery. The appropriateness of surgery and preferred operative approaches has not been examined in detail for patients with DLS and sagittal imbalance. PURPOSE: The goals of this article were to describe what is currently known about the relationship between sagittal imbalance and health outcomes among patients with DLS and to determine how indications for surgery in patients with DLS differ when sagittal imbalance is present. STUDY DESIGN/ SETTING: This study included a literature review and an expert panel using the RAND/University of California at Los Angeles (UCLA) Appropriateness Method. METHODS: To develop appropriate use criteria for DLS, researchers at the RAND Corporation recently employed the RAND/UCLA Appropriateness Method, which involves a systematic review of the literature and multidisciplinary expert panel process. Experts reviewed a synopsis of published literature and rated the appropriateness of five common operative approaches for 260 different clinical scenarios. In the present work, we updated the literature review and compared panelists' ratings in scenarios where imbalance was present versus absent. This work was funded by the Collaborative Spine Research Foundation, a group of surgical specialty societies and device manufacturers. RESULTS: On the basis of 13 eligible studies that examined sagittal imbalance and outcomes in patients with DLS, imbalance was associated with worse functional status in the absence of surgery and worse symptoms and complications postoperatively. Panelists' ratings demonstrated a consistent pattern across the diverse clinical scenarios. In general, when imbalance was present, surgery was more likely to be appropriate or necessary, including in some situations where surgery would otherwise be inappropriate. For patients with moderate to severe symptoms and imbalance, a deformity correction procedure was usually appropriate and frequently necessary, except in some patients with severe risk factors for complications. Conversely, procedures that did not correct imbalance, when present, were usually inappropriate. CONCLUSIONS: Clinical experts agreed that sagittal imbalance is a major factor affecting both when surgery is appropriate and which type of procedure is preferred among patients with DLS.
BACKGROUND CONTEXT: Degenerative lumbar scoliosis (DLS) is often associated with sagittal imbalance, which may affect patients' health outcomes before and after surgery. The appropriateness of surgery and preferred operative approaches has not been examined in detail for patients with DLS and sagittal imbalance. PURPOSE: The goals of this article were to describe what is currently known about the relationship between sagittal imbalance and health outcomes among patients with DLS and to determine how indications for surgery in patients with DLS differ when sagittal imbalance is present. STUDY DESIGN/ SETTING: This study included a literature review and an expert panel using the RAND/University of California at Los Angeles (UCLA) Appropriateness Method. METHODS: To develop appropriate use criteria for DLS, researchers at the RAND Corporation recently employed the RAND/UCLA Appropriateness Method, which involves a systematic review of the literature and multidisciplinary expert panel process. Experts reviewed a synopsis of published literature and rated the appropriateness of five common operative approaches for 260 different clinical scenarios. In the present work, we updated the literature review and compared panelists' ratings in scenarios where imbalance was present versus absent. This work was funded by the Collaborative Spine Research Foundation, a group of surgical specialty societies and device manufacturers. RESULTS: On the basis of 13 eligible studies that examined sagittal imbalance and outcomes in patients with DLS, imbalance was associated with worse functional status in the absence of surgery and worse symptoms and complications postoperatively. Panelists' ratings demonstrated a consistent pattern across the diverse clinical scenarios. In general, when imbalance was present, surgery was more likely to be appropriate or necessary, including in some situations where surgery would otherwise be inappropriate. For patients with moderate to severe symptoms and imbalance, a deformity correction procedure was usually appropriate and frequently necessary, except in some patients with severe risk factors for complications. Conversely, procedures that did not correct imbalance, when present, were usually inappropriate. CONCLUSIONS: Clinical experts agreed that sagittal imbalance is a major factor affecting both when surgery is appropriate and which type of procedure is preferred among patients with DLS.