Degenerative Spinal Conditions Posted on February 21, 2011 Posted in All Podcasts, Neurology And Neurosurgery Podcast: Download (Duration: 9:32 — 8.7MB) Subscribe: RSS Tim Witham, MD, discusses treatment alternatives for lumbar (lower back) and cervical spine conditions. Dr Witham is a neurosurgeon with the Johns Hopkins Neurosurgical Spine Center.