Grading apical vertebral rotation without a computed tomography scan: a clinically relevant system based on the radiographic appearance of bilateral pedicle screws.
Upasani VV, Chambers RC, Dalal AH, Shah SA, Lehman RA, Newton PO. Grading apical vertebral rotation without a computed tomography scan: a clinically relevant system based on the radiographic appearance of bilateral pedicle screws. Spine (Phila Pa 1976). 2009 Aug 01; 34(17):1855-62.