My injury on Jan 16th, 2001 was a missed step like yours. I was carrying a garbage bag held in front of me. I walked down a sidewalk and off a curb. I thought it was a ramp but it was an 8 inch curb. I landed with my left knee locked and back arched. I jarred from my left pelvis to my head. I am still suffering from the symptoms from that event.

An Upper Cervical Chiro found that my left Atlas/occipital condyle joint is still out of place. I started treatment until my insurance company refused to pay.

So, I know how much damage a missed step can do.

My best to you.