Hi, Thanks for writing in. Spinal fusion like TLIF is a surgical technique to stabilize the spinal vertebra. It is usually a successful procedure but 10 to 20 percent people might have some pain even after the surgery. In that case you might have to get repeat MRI scan imaging done to know if there is pinching of nerves at some other place in the lower back. Many times it has been observed that the nerves remain under pressure even after surgery. This is because compression on the nerves occurs at places other than where surgery has been done. You might have to go through repeat surgery if the pain is severe. Else you can also choose to take treatments like radio frequency ablation and nerve root block. If the pain is mild then doing physiotherapy, avoiding heavy physical activities and nerve pain relievers might make you feel comfortable. Please do not worry.