recumbant bikes, anyone use a 3 wheeled?

I have fractured my spine several times, 2 at cervicle, 1 at thorasic, 2'ce lumbar and have come back from paralysis twice. RA and MS are taking a toll on my strength and balance. I no longer feel safe on my 2 wheel upright bike and do not want an electric wheel chair again. I cannot drive and want to know if a recumbant bike is safe on joints and spine. I want to get an electric model so I can still pedal when my nerves are connecting ok.