1. Current Concepts Review - Degenerative Lumbar Spinal Stenosis* by JEFFREY M. SPIVAK J Bone Joint Surg Am Volume 80(7):1053-66 July 1, 1998 ©1998 by The Journal of Bone and Joint Surgery, Inc.

2. Fig. 1 Anatomical grid pattern used to evaluate lumbar spinal stenosis. JEFFREY M. SPIVAK J Bone Joint Surg Am 1998;80:1053- 66 ©1998 by The Journal of Bone and Joint Surgery, Inc.

3. Figs. 2-A and 2-B: Imaging studies of a seventy-seven-year-old man who had persistent left- sided radicular pain. JEFFREY M. SPIVAK J Bone Joint Surg Am 1998;80:1053- 66 ©1998 by The Journal of Bone and Joint Surgery, Inc.

4. Fig. 2-B Computerized tomographic scan, made after myelography, demonstrating bilateral degenerative cysts on the facets of the fifth lumbar and first sacral vertebrae (arrowheads), producing lateral-recess stenosis. JEFFREY M. SPIVAK J Bone Joint Surg Am 1998;80:1053- 66 ©1998 by The Journal of Bone and Joint Surgery, Inc.

5. Figs. 3-A and 3-B: Imaging studies of a seventy-seven-year-old man who had resection of a squamous-cell carcinoma of the lung two years previously. JEFFREY M. SPIVAK J Bone Joint Surg Am 1998;80:1053- 66 ©1998 by The Journal of Bone and Joint Surgery, Inc.

6. Fig. 3-B: Sagittal magnetic resonance image showing an expansile sacral mass (arrow) causing displacement and compression of the left nerve root of the first sacral vertebra. JEFFREY M. SPIVAK J Bone Joint Surg Am 1998;80:1053- 66 ©1998 by The Journal of Bone and Joint Surgery, Inc.

7. Figs. 4-A and 4-B: Magnetic resonance images of a patient who had severe degenerative lumbar spinal stenosis. JEFFREY M. SPIVAK J Bone Joint Surg Am 1998;80:1053- 66 ©1998 by The Journal of Bone and Joint Surgery, Inc.

8. Fig. 4-B Axial image showing compression of both the central spinal canal and the lateral recesses. JEFFREY M. SPIVAK J Bone Joint Surg Am 1998;80:1053- 66 ©1998 by The Journal of Bone and Joint Surgery, Inc.