I was hit by a car when I was 13 and crushed a vertebrae which healed misshapen. I've had trouble all my life with running, walking, and cycling. However, rarely had trouble on a recumbent unless I got the leg length set too long. If I reach, it tends to arch the lower back and then I have back trouble. I've been riding bents since 2003 and can dial in a new bent pretty fast but sometimes I still get the leg reach a bit long and start getting sore. I've learned to correct it pretty fast.
Short answer: You may have little back trouble at all.
