Bischoff Myelotomy

Hi all. My hubs is a T5-T6 paraplegic, has been for 30 years. He has begun to struggle with spasticity of his lower extremities. They generally begin in his big toe and cause what he calls toe tapping. Spasms usually begin in the evening, often upon laying down, and will keep him up all night. Leading to insomnia. He has tried multiple treatments, baclofen, tizanidine, antidepressant and antianxiety meds, radio frequency ablation, and Botox injections. Currently he is considering a procedure called a Bischoff Myelotomy. We are having trouble finding any information on the procedure or of docs who perform the surgery. Does anyone have any prior knowledge, experience, or bits of wisdom you could share? TIA.