The symposium entitled “New Developments in Lumbar Spinal Stenosis”, was designed to present an update of techniques, long-term results, and surgical recommendations for difficult or associated problems in the treatment of patients with this disorder. The Guest Editors are grateful to the following authors for their immense contributions. K. Hansraj and colleagues presented a new clinical classification system describing typical and complex lumbar spinal stenoses. The authors presented clinical, outcome, and survivorship results. P. O’Leary and S. McCance presented a new minimally invasive technique for decompression of the lumbar spine. The technique of distraction laminoplasty is presented. K. Bridwell and colleagues described the surgical treatment of patients with spinal stenosis with fixed sagittal imbalance. Surgical strategies including an algorithm are presented. E. Simmons and E. Simmons discussed surgical treatment of patients with lumbar spinal stenosis with associated scoliosis. The authors emphasize decision making and surgical techniques. H. Bassewitz and H. Herkowitz presented the current concepts of surgical treatment of patients with lumbar spinal stenosis with associated spondylolisthesis. J. Jane and colleagues described the current recommendations for surgical treatment of patients with lumbar spinal stenosis from a neurosurgical point of view. Special emphasis was given to decision making regarding fusion. Considerations were made regarding safe surgical technique. R. Benz and S. Garfin discuss the current techniques and salient factors in surgical decompression of the lumbar spine. D.S. Weiss presented the current techniques of spinal cord and nerve root monitoring during surgical treatment. S. Reeg presented general recommendations for perioperative treatment based on the medical comorbidities, age-related pathophysiologic changes to the cardiovascular, pulmonary, and central nervous systems. T. Faciszewski and colleagues presented important recommendations for cardiac evaluation of patients undergoing elective spinal surgery for symptomatic spinal stenosis. R. Benz and colleagues discussed comorbid factors in predicting complications in elderly patients undergoing lumbar decompression surgery. L. St. Louis presented a discussion on the uses of the magnetic resonance imaging and computed tomography myelogram in the assessment of patients with lumbar spinal stenosis. The author focused on the evaluation of failed surgeries, instability, associated spondylolisthesis, associated scoliosis, associated junctional stenosis, and associated osteoporosis. E. Arbit and S. Pannullo provided a brief history, classification, clinical presentation, and pertinent anatomy of lumbar spinal stenosis. Emphasis was given to the etiology, pathologic features, and correlation with where the thecal sac and nerve root impingement occurs. M. Bodack and M. Monteiro described therapeutic exercises in the treatment of patients with lumbar spinal stenosis. Techniques and specific recommendations are made for the conservative treatment of these patients. A. Simotas and colleagues presented clinical results of nonoperative treatment for lumbar spinal stenosis.