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I would focus on glute activation as that actually is quite vital to lumbar health.
Obviously I am not a doctor but have had enough care by body workers of all types and anytime I had lumbar issues with my very strong core they would have me work on glutes and the pain would be eased quickly. I realize your issue is more serious than what I have encountered but if you are already looking at exercise to support the issue it is worth incorporating.
Also lots of core exercises will activate the quad, sort of as an aid to the abdominals when they get fatigued or are weak to the point you become quad dominant and your body will naturally use glutes less so they become weak and cannot do their job supporting the lower back.
If you select core exercises that do not activate quads it will help keep you from making your body naturally neglect use of glutes.
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