Spondylolysis @ L5-S1: seek endo/laparoscopic repair...

I'm new to the forum - both myself (age 45) and my mother (age 77) have issues with our backs and are researching non-invasive laparoscopic/endoscopic laser and/or fusion procedures as well as the locations and surgeons Canada-side that can provide options for us. I have a bilateral spondylolysis @ L5-S1with no significant slippage yet. My main symptoms are lumbar pain and weakness, numbness, pins/needles down my right leg. I am seeking to avoid open invasive back fusion (my only known option in Sask) and wonder if the community can point me in some more progressive directions? My mother is at a stage 2 Spondylolisthesis with significant slippage. She utilizes a walker and wheelchair and probably wouldn't recover from open back fusion - she also resides in Sask. I am currently costing out and lining up a 'second opinion' appointment for myself (and my mom) to travel to the False Creek Spine Clinic, Vancouver, to consult with surgeon Dr. Stephen Helper. Can anyone out there recommend him? I was researching Winnipeg surgeons when I came across this forum. Thanks for any help!