Fig. 5.

Case example for grade 3 collapse. (A, B) Preoperative anteroposterior and lateral radiograph demonstrating grade 3 collapse at L4. (C) Preoperative sagittal computed tomography (CT) image showing severely collapsed superior endplate at L4. (D, E) Preoperative sagittal and axial magnetic resonance imaging (MRI) showing severe central stenosis due to retropulsed bony fragment. (F, G) Postoperative radiographs at 24 months after two-level LIF. (H) Postoperative coronal CT image showing bony fusion 24 months postoperatively. (I) Postoperative axial MRI showing indirectly decompressed central canal.