Successful spinal fusions?

My husband has recently been diagnosed with EDS classic with overlapping hypermobility. He sustained a back injury 21 months ago. He's already had a laminectomy and discectomy. He only has 25% of his L5-S1 disc left, which has reherniated, with four other discs bulging now. Neuro said to do our homework to decide if he's ready to for a spinal fusion, considering we are now out of options since the epidural steroid injections failed to help. I was wanting to know if any EDSers out there have had a successful spinal fusion of the lower lumbar region, as well as if anyone has any documented case studies of such a situation. Any advice or knowledge would be greatly appreciated.