Approximately 80% of the population will have low back at some point in their lives. Very few people, however, have a serious medical problem which requires surgery. Many conditions resolve conservatively with little or no treatment or with conservative modalities such as physical therapy, medication and/or injections. The causes of low back pain are varied. They may result from injury, trauma or the natural process of aging, known as degeneration. Some of the most common back pain is related to muscle strain, bulging or herniated discs, spinal stenosis, sciatica or sacral iliac joint inflammation and degenerative disc disease. When conservative measures fail, your physician may suggest the need for surgery.