Background The important relationship between sagittal spinal alignment and total hip
arthroplasty (THA) is becoming well recognized. Prior research has shown a significant …

… Stekas BS a , Ethan W. Ayres MPH a , Christopher G. Varlotta BS a , Virginie Lafage PhD
b , Renaud Lafage MS b , Thomas Errico MD a , Peter G. Passias MD a , Themistocles S. …

Background Spinal degeneration and lumbar flatback deformity can decrease recruitment of
protective posterior pelvic tilt when sitting, leading to anterior impingement and increased …

Study Design. Retrospective review of an adult deformity database. Objective. To identify
pelvic incidence (PI) and age-appropriate physical function alignment targets using a …

OBJECTIVE Neck and back pain are highly prevalent conditions that account for major
disability. The Neck Disability Index (NDI) and Oswestry Disability Index (ODI) are the two most …

… Predicting the magnitude of distal junctional kyphosis following cervical deformity correction
Ethan W. Ayres, MPH1, Themistocles S. Protopsaltis, MD1, Renaud Lafage, MSc2, Gregory …

Study Design: This was a single-center retrospective review. Objectives: To explore how age
and gender affect PROMIS scores compared with traditional health-related quality of life (…

Study Design. Retrospective review of a cervical deformity database. Objective. This study
aimed to develop a model that can predict the postoperative distal junctional kyphosis angle (…

In the current value-based healthcare climate where spine surgery is shifting to the ambulatory
setting, factors influencing postop length of stay (LOS) are important to surgeons and …

… High preoperative T1 slope is a marker for global sagittal malalignment Ethan W. Ayres,
MPH1, Dainn Woo, BS1, Dennis Vasquez-Montes, MS, BA1, Avery Brown, BS1, Haddy Alas, …