The specific indications for lumbar fusion are spinal instability, i.e. a slippage of angulation of the vertebral bodies. It is rare to prescribe a fusion for a simple disc herniation. Unfortunately, there are a lot of more vague indications being marketed today for fusions, resulting in a lot of procedures that we feel are unnecessary, and possibly very harmful for these patients. While modern medicine is making vast improvements in the ability to perform fusions in the lumbar spine, the indications remain controversial. Seek out several opinions on whether a lumbar fusion is recommended.