1. A Comparative Biomechanical Investigation of Anterior Lumbar Interbody Cages: Central and Bilateral Approaches* by THOMAS R. OXLAND, ZOLTAN HOFFER, THOMAS NYDEGGER, GABOR C. RATHONYI, and LUTZ-P. NOLTE J Bone Joint Surg Am Volume 82(3):383-93 March 1, 2000 ©2000 by The Journal of Bone and Joint Surgery, Inc.

2. Figs. 1-A, 1-B, and 1-C: Anteroposterior and lateral radiographs of the two types of interbody cages and the translaminar screw fixation used in the current study. THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.

3. Fig. 1-B The SynCage is a porous titanium device with contoured surfaces, which was placed centrally into the disc space. THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.

4. Fig. 1-C Translaminar screw fixation consists of two bone screws crossing through the lamina and the facet joints. THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.

5. Fig. 2 Anteroposterior views of three different setups for multidirectional flexibility testing. THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.

6. Fig. 3-A Average moment-rotation curves in flexion-extension for all specimen conditions are shown for the BAK device (Fig. 3-A) and the SynCage device (Fig. 3-B). THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.

7. Fig. 3-B Average moment-rotation curves in flexion-extension for all specimen conditions are shown for the BAK device (Fig. 3-A) and the SynCage device (Fig. 3-B). THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.

8. Fig. 4-A Average moment-rotation curves in axial rotation for all specimen conditions are shown for the BAK device (Fig. 4-A) and the SynCage device (Fig. 4-B). THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.

9. Fig. 4-B Average moment-rotation curves in axial rotation for all specimen conditions are shown for the BAK device (Fig. 4-A) and the SynCage device (Fig. 4-B). THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.

10. Fig. 5-A Average moment-rotation curves in lateral bending for all specimen conditions are shown for the BAK device (Fig. 5-A) and the SynCage device (Fig. 5-B). THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.

11. Fig. 5-B Average moment-rotation curves in lateral bending for all specimen conditions are shown for the BAK device (Fig. 5-A) and the SynCage device (Fig. 5-B). THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.

12. Fig. 6 Box-stem plot comparing the two cage designs. THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.

13. Fig. 7 Box-stem plot summarizing the effect, on spinal stabilization, of insertion of a cage alone and a cage with supplementary translaminar screw fixation (TLS). THOMAS R. OXLAND et al. J Bone Joint Surg Am 2000;82:383-93 ©2000 by The Journal of Bone and Joint Surgery, Inc.