Hi, Spine comprises of vertebrae, spinal cord, spinal nerves, ligaments, muscles and blood vessels. Each vertebra has vertebral body and posterior vertebral arch. There is foramina in each vertebra. These foraminae connects to form the spinal canal through the spinal cord passes. Spinal cord is the neural continuation of the brain transmitting the neural commands from the brain to the muscles. It also transmits signals from periphery to centre in sensory perception. In between the vertebra is the inter-vertebral disc. The spinal cord is covered by a membrane called thecal sac. Spinal cord floats in cerebrospinal fluid. Spinal nerves exits from the spinal cord through the intervertebral foramen or neural foraminae. In your report, the intervertebral disc protrudes out posteriorly and compress the thecal sac covering and squeeze the spinal roots in the neural foramen. It causes radiating pain the parts supplied by the nerves. Vertebrae classified into cervical, thoracic, lumbar and sacrococcygeal. There are abnormality at the L4-L5, L3-L4 and L5-S1 level. Treatment depends on the level of disorder and associated symptoms. Since there are compression at multiple level, surgery is the preferred choice to maintain the quality of life. Physiotherapy helps for shorter time frame. Discuss with your orthopedic specialist about the same. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Pradeepraj, General & Family Physician