I had L3-L5 done over 10 yrs ago. I had my left SI Joint fused Dec 2019 & the right SI joint fused June 2020. At some point I started having left butt cheek pain & I just thought it was my piriformis acting us, as it has in the past. No matter HOW much stretching I did, the pain didn't go away, but rather started to increase. The pain got so bad that when I turned over in bed, I would be woken by screaming pout in pain. I finally seen my Dr in Dec 2023 & found out it's a non union! So, I'm going back in in a few days for more screws & bone graphs. I will be OVER THE TOP careful with my recovery this time.