I had a 2-level TLIF (L4-S1)about 8 months ago. Everything seems to be going well. Since I'm in the military, I stay very active and was able to pass my fitness test last month. My last post-op x-rays (4 months ago) shows fusion taking place. Unfortunately I smoke and it slows down the fusion process. I have no lower back pain, but have recently started to get hip or piriformis muscle tightness. I stretch it everyday and was wondering if this is a normal part of the healing process. Prior to surgery, I looked like I had scoliosis cause I was leaning to one side. Could the hip/piriformis pain be associated with my condition prior to surgery? Are the muscles just really tight since my muscles were compensating for one side? Also, I only get lower back pain if I lay on my stomach for a long period of time. Any help or info would be greatly appreciated.