Many spinal diseases cause back pain and eventually destabilized the spine. They make it weak and unstable, like long standing slip disc, tumors, trauma, deformities, degeneration and infection. Such patients require spinal fusion as a treatment. Spine is fixed with screws and rod, cages etc,along with bonegraft, to make two segment of spine, as one. This allivietes backpain. There is fast changing technology in this field and new version of implants are available, which can be inserted by minimally invasive approach, for excellent results and early recovery.