Fig. 1From: 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 24āmonths after surgery showing no indication of radiographic ASD. fāj Preoperative coronal MR imageBack to article page