Frailty Stratification Using the Modified 5-Item Frailty Index: Significant Variation within Frailty Patients in Spine Surgery

Gastón Camino-Willhuber, Henryk Haffer, Maximilian Muellner, Yusuke Dodo, Erika Chiapparelli, Soji Tani, Krizia Amoroso, Michele Sarin, Jennifer Shue, Ellen M. Soffin, William D. Zelenty, Gbolabo Sokunbi, Darren R. Lebl, Frank P. Cammisa, Federico P. Girardi, Alexander P. Hughes, Andrew A. Sama