Quantifying the Importance of Upper Cervical Extension Reserve in Adult Cervical Deformity Surgery and Its Impact on Baseline Presentation and Outcomes.

Passias PG, Mir JM, Schoenfeld AJ, Yung A, Smith JS, Lafage V, Lafage R, Diebo B, Daniels AH, Line BG, Eastlack RK, Mundis GM, Kebaish KM, Mullin JP, Fessler RG, Mummaneni PV, Chou D, Hamilton DK, Lee SH, Soroceanu A, Scheer JK, Protopsaltis T, Kim HJ, Buell TJ, Hostin RA, Gupta MC, Klineberg EO, Riew KD, Burton DC, Schwab FJ, Bess S, Shaffrey CI, Ames CP, International Spine Study Group