In the video, London Neurosurgeon Mr Dan Plev explains the purpose of spinal surgery in relieving back pain. In some cases the back pain is connected to other places including the legs and arms. The most important part is finding out the cause of the back pain. According to Plev, in most cases the pain is related to the degeneration of the disc, which then leads to the disc losing height. Then there is more pressure and strain on the other discs, causing pain and discomfort. Surgery is an option to restore the lost disc height. In addition to doing physiotherapy, there can be a solution for the patient.