Second opinion helped me feel much more at ease going ahead with surgery. He said definite L4-5 fusion and felt including 3-4 may be more prophylactic in nature as some of the bone from L3 was removed during my decompression surgery on L4-5; also due to the fact I have osteoporosis. He never mentioned L5-S1. I did take my MRI disc and report. He feels my issues will only progress due to the scar tissue/inflammation from the L4-5 pars fracture.
Thanks again for your opinion and knowledge. I’m planning this for September.