I am not sure but I have pars defects one on top of the other at L4 and L5. I am very confused as my surgeon says this isn't very common and that it is usually bilateral pars defects. I have also ddd and bulging discs along with stenosis on my left side. I have been in constant pain now for well over a year. My husband is against a fusion but i have now seen 3 surgens all the the same conclusion: spinal fusion. Is there anyone else out there that has this?? Any help is appreciated as I am new to the board as well.