Fig. 2From: Risk factors for upper adjacent segment degeneration after multi-level posterior lumbar spinal fusion surgerya, b Preoperative anteroposterior and lateral radiograph. c Preoperative sagittal MR image. d, e Anteroposterior and lateral radiograph 18āmonths after surgery showing radiographic ASD, T12/L1 disc height decreased from 7.50 to 6.0āmm. fāj Preoperative coronal MR imageBack to article page