Failed back syndrome is a common language name for FBSS (Failed Back Surgery Syndrome). It describes a condition present on certain patients that have bad results following a failed back surgery. Its naming has no equivalent to other forms of failed surgery.Back surgery has a good success rate, situated at around 95%. It is not that uncommon that the patient undergoing the operation will still have the pain symptoms present afterwards. In some cases, the actual pain inducing anatomical changes are not corrected properly. The surgeon might completely or partially miss some of the target tissue, which will continue to create discomfort. The general causes for this usually involves a less precise or incorrect diagnostic.